Sources and Guidelines Referenced

This clinical guide incorporates evidence and diagnostic frameworks from leading international pediatric and nephrological bodies, including: International Pediatric Nephrology Association (IPNA 2022, 2023 Guidelines on Nephrotic Syndrome, CAKUT, and Hypertension), Kidney Disease: Improving Global Outcomes (KDIGO 2021, 2024 Clinical Practice Guidelines for Glomerular Diseases and CKD), European Society for Paediatric Nephrology (ESPN 2023 Recommendations), American Academy of Pediatrics (AAP 2022 Clinical Practice Guidelines on Urinary Tract Infections and Hypertension), and the American Heart Association (AHA/IPNA 2022 Consensus Statements).

Pediatric Nephrology: A Comprehensive Patient Guide

1. Definition and Medical Identity

Pediatric nephrology is the specialized branch of medicine focused on diagnosing, treating, and managing structural, genetic, and acquired kidney and urinary tract disorders in neonates, infants, children, and adolescents. Known clinically as pediatric renal medicine, this subspecialty aims to preserve renal architecture, maintain fluid and electrolyte homeostasis, reduce systemic disease complications, and promote normal growth and development in young patients.

The subspecialty spans non-invasive disease management, complex pharmacological immunosuppression, diagnostic tissue biopsy, and specialized pediatric renal replacement therapies (including peritoneal dialysis, hemodialysis, and kidney transplantation). Clinicians in this field are specialized pediatric nephrologists who work in multidisciplinary teams alongside pediatric urologists, renal dietitians, pediatric radiologists, specialized nurses, and transplant surgeons.

2. The Underlying Condition or Need

Pediatric nephrology addresses disorders affecting the renal parenchyma, tubular transport systems, glomeruli, or upper and lower urinary tract anatomy. Unlike adult kidney disease, which is primarily driven by acquired metabolic conditions like type 2 diabetes and long-standing essential hypertension, pediatric kidney disease is predominantly congenital, genetic, or autoimmune in origin.

The biological problems requiring pediatric nephrology care fall into four main categories:

• Congenital Anomalies: Structural birth defects affecting renal development or urinary flow, such as renal hypodysplasia, solitary functioning kidney, or posterior urethral valves.
• Glomerular Diseases: Immunological damage to the renal filtering units, leading to significant urinary protein loss (nephrotic syndrome) or cellular inflammation and hematuria (nephritic syndrome).
• Tubular and Metabolic Disorders: Defects in specialized renal tubule channels, causing electrolyte wasting, metabolic acidosis, or stone formation (nephrolithiasis).
• Renal Insufficiency and Failure: Sudden (acute kidney injury) or progressive (chronic kidney disease) loss of total nephron function, impairing waste excretion, fluid regulation, erythropoiesis, and bone mineral metabolism.

If left untreated, severe pediatric renal disease can lead to life-threatening complications, including acute pulmonary edema, hyperkalemia, severe hypertensive crisis, severe growth failure, uremic encephalopathy, and premature cardiovascular morbidity (KDIGO 2024).

3. How the Treatment Works — Mechanism

Pediatric nephrology utilizes targeted biological, pharmacological, and mechanical mechanisms to restore or support kidney function depending on the specific underlying pathology.

Glomerular Immunomodulation

In autoimmune and inflammatory glomerular conditions (such as minimal change disease or lupus nephritis), therapy focuses on suppressing immune-mediated injury to the podocytes (specialized epithelial cells wrapping the glomerular capillaries). Corticosteroids and steroid-sparing immunosuppressants interrupt T-cell activation, cytokine production, and antibody formation. This repairs the podocyte slit diaphragms, restoring the charge and size selectivity of the glomerular basement membrane and stopping pathogenic protein leakage into the urine.

Hemodynamic and Blood Pressure Regulation

In chronic kidney disease and renal parenchymal disease, hyperfiltration injury in remaining functional nephrons accelerates progressive tissue scarring (glomerulosclerosis). Pediatric nephrologists utilize inhibitors of the renin-angiotensin-aldosterone system (RAAS), such as angiotensin-converting enzyme (ACE) inhibitors or angiotensin II receptor blockers (ARBs). These agents selectively dilate the efferent arteriole of the glomerulus, lowering intraglomerular hydrostatic pressure, reducing proteinuria, and slowing progressive renal damage (AHA/IPNA 2022).

Renal Replacement Mechanisms

When native nephron mass declines below approximately 10-15% of normal (end-stage renal disease), mechanical clearance is required. Peritoneal dialysis utilizes the patient's biological peritoneal membrane as a semipermeable filter; hypertonic glucose-based dialysate instillation removes solutes via diffusion and excess water via ultrafiltration. Hemodialysis uses an extracorporeal blood circuit and a synthetic dialyzer filter. Kidney transplantation replaces lost nephron mass entirely with a donor organ, restoring native endocrine, excretory, and metabolic capabilities.

4. Types and Variations

Management pathways in pediatric nephrology are stratified according to clinical severity, disease acuity, and specific underlying anatomical or functional pathology.

Selection of the appropriate therapeutic protocol is dictated by histologic findings from renal biopsy, genetic sequencing, eGFR calculated via the Bedside Schwartz formula, and age-specific developmental considerations.

5. Who the Treatment Is For — Indications

Pediatric nephrology care is indicated for infants, children, and adolescents presenting with specific clinical, laboratory, or radiological markers of renal dysfunction.

Primary Indications

• Proteinuria: Persistent urinary protein excretion (>4 mg/m²/hour or urine protein-to-creatinine ratio >0.2 mg/mg, with nephrotic range defined as >2.0 mg/mg) (IPNA 2023).
• Hematuria: Persistent glomerular hematuria, characterized by dysmorphic red blood cells or red blood cell casts on urine microscopy.
• Decreased Renal Function: Sustained reduction in estimated glomerular filtration rate (<90 mL/min/1.73m² for age >2 years) or acute elevation in serum creatinine above age-adjusted reference limits.
• Pediatric Hypertension: Confirmed blood pressure ≥95th percentile for age, sex, and height (or ≥130/80 mmHg in adolescents ≥13 years) (AAP 2022).
• Congenital Structural Defects: Antenatal or postnatal sonographic detection of hydronephrosis, solitary kidney, multicystic dysplastic kidney, or cystic disease.
• Electrolyte and Acid-Base Imbalances: Unexplained persistent metabolic acidosis, hypokalemia, hyperkalemia, renal tubular acidosis, or nephrocalcinosis.

6. Who the Treatment Is NOT For — Contraindications

While pediatric nephrology as a broad medical field has no universal contraindications, specific procedures and therapies within the specialty carry absolute and relative contraindications.

Renal Biopsy Contraindications

• Absolute: Uncorrected severe bleeding diathesis or severe unmanageable coagulopathy; active, untreated severe systemic infection or skin infection overlying the biopsy site.
• Relative: Uncontrolled severe hypertension (markedly elevates bleeding risks); solitary native kidney (requires enhanced caution and experienced operator); severe hydronephrosis or small, end-stage shrunken kidneys where tissue yield is uninformative and bleeding risk is elevated.

Renal Replacement Contraindications

• Peritoneal Dialysis Contraindications: Severe peritoneal membrane scarring, extensive abdominal wall defects (e.g., omphalocele, gastroschisis), uncorrected diaphragmatic-peritoneal communication, or active intra-abdominal sepsis.
• Kidney Transplantation Contraindications: Active, untreated systemic malignancy; active uncontrolled systemic infection; severe irreversible extra-renal organ failure that precludes survival; documented severe, unmanageable non-adherence following multidisciplinary evaluation.

7. Alternatives and Clinical Comparison

Depending on the clinical scenario, management strategies in pediatric nephrology involve evaluating conservative, pharmacological, and surgical pathways.

8. Pre-Treatment Phase

The pre-treatment and workup phase in pediatric nephrology establishes precise diagnosis, assesses organ function, and prepares the child and family physically and psychologically.

Diagnostic Workup

Diagnostic evaluation includes mandatory baseline laboratory testing: complete blood count, serum creatinine, urea, electrolytes, calcium, phosphate, magnesium, albumin, liver enzymes, and serum immunoglobulins. Specialized immunologic screens (ANA, complement C3/C4, ANCA, anti-PLA2R) are drawn if glomerulonephritis is suspected. Genetic panel testing is increasingly utilized for early-onset nephrotic syndrome (under 1 year of age), atypical HUS, and inherited tubulopathies (IPNA 2022).

Imaging and Functional Baseline

High-resolution renal ultrasonography with Doppler imaging evaluates kidney size, echogenicity, corticomedullary differentiation, and vascular flow. Nuclear medicine scans evaluate differential function and renal scarring: Tc-99m DMSA measures parenchymal integrity, while Tc-99m MAG3 evaluates urinary drainage and obstruction.

Pre-Procedure Preparation

For invasive interventions such as renal biopsy, blood pressure must be optimized using anti-hypertensive agents. Coagulation panels (PT, INR, aPTT, platelet count) are verified. The child must complete pre-anesthesia fasting (typically 6 hours for solid foods, 2 hours for clear liquids). Sedation or general anesthesia is coordinated with pediatric anesthesiologists to ensure complete motionlessness during biopsy needle advancement.

9. The Procedure — Step-by-Step Clinical Detail

Below is the step-by-step clinical walkthrough of two core specialized procedures in pediatric nephrology: diagnostic percutaneous ultrasound-guided renal biopsy and automated peritoneal dialysis access management.

A. Ultrasound-Guided Percutaneous Renal Biopsy

1. Anesthesia & Positioning: The pediatric patient is placed under deep sedation or general anesthesia in the prone position with a firm pillow under the abdomen to elevate the kidneys posteriorly.
2. Localization: High-frequency real-time ultrasound is used to identify the lower pole of the chosen kidney (typically the left kidney to avoid proximity to the liver and gallbladder).
3. Sterile Preparation & Local Anesthesia: The overlying skin is prepped with chlorhexidine solution and draped. Local anesthetic (1% lidocaine) is infiltrated into the subcutaneous tissue along the needle track down to the renal capsule.
4. Needle Insertion & Core Collection: Under continuous ultrasound guidance, a spring-loaded automated biopsy needle (typically 16-gauge or 18-gauge designed for pediatrics) is advanced through a small skin nick into the lower pole renal cortex. The firing mechanism is deployed to capture a cortical tissue sample.
5. Verification & Processing: The needle is withdrawn, and the core specimen is inspected under a dissecting microscope to confirm the presence of glomeruli. Typically 2 to 3 cores are obtained for light microscopy, immunofluorescence, and electron microscopy.
6. Hemostasis & Dressing: Direct manual pressure is applied over the biopsy site for 10-15 minutes. A sterile occlusive compression dressing is applied.

B. Automated Peritoneal Dialysis (APD) Access and Execution

1. Catheter Placement: A double-cuffed Tenckhoff peritoneal catheter is surgically inserted under general anesthesia, with the tip placed in the deep pelvis and the exit site directed downward on the abdominal wall.
2. Healing Period: A primary break-in period of 10 to 14 days is allowed for tissue ingrowth into the Dacron cuffs before initiating full-volume dialysate dwells, preventing early pericatheter leakage.
3. Cycler Setup: At bedtime, the catheter is connected via sterile technique to an automated peritoneal dialysis cycler machine pre-loaded with physician-prescribed dialysate solution (glucose concentrations of 1.5%, 2.5%, or 4.25% based on ultrafiltration targets).
4. Automated Overnight Dwells: The machine automatically performs multiple fill, dwell, and drain cycles over 8 to 10 hours while the child sleeps, removing metabolic waste and excess fluid.

10. Immediate Post-Procedure Period

Following a percutaneous renal biopsy or minor invasive renal procedure, the immediate post-procedure window requires intensive clinical monitoring to identify complications early.

First 24 to 48 Hours

• Bed Rest: Strict supine bed rest is enforced for 6 to 12 hours post-biopsy to reduce post-puncture renal bleeding risks.
• Vital Sign Monitoring: Pulse rate and blood pressure are measured every 15 minutes for the first 2 hours, every 30 minutes for the next 2 hours, and hourly thereafter. Tachycardia or falling blood pressure indicates potential internal hematoma formation.
• Urine Color Surveillance: Every voided urine specimen is collected and visually inspected for gross hematuria. Microscopic hematuria is expected; gross hematuria with blood clots requires urgent sonographic reassessment.
• Pain Management: Mild localized flank soreness is managed with acetaminophen. Nonsteroidal anti-inflammatory drugs (NSAIDs) are strictly avoided due to their adverse effects on renal hemodynamics and platelet aggregation.
• Discharge Criteria: Patients are discharged after 24 hours if vital signs remain stable, urine is visually clear, serial hemoglobin levels are stable, and post-biopsy sonogram reveals no expanding hematoma.

11. Recovery — Short and Long Term

Recovery timelines in pediatric nephrology differ significantly between acute illness resolution, ongoing chronic therapy management, and post-transplant functional recovery.

12. Risks, Side Effects, and Complications

Therapeutic interventions and diagnostic procedures in pediatric nephrology carry specific risk profiles, which are stratified below by severity and incidence rate.

Warning Signs Requiring Urgent Medical Attention

Parents and caregivers must seek immediate emergency medical evaluation if the child exhibits any of the following signposts:

• Sudden onset of gross hematuria (dark red or cola-colored urine) or passage of blood clots.
• Significant drop in urine output (oliguria) or complete cessation of voiding (anuria).
• Rapid weight gain accompanied by severe puffiness around the eyes (periorbital edema) or swollen feet/abdomen.
• Fever over 38.5°C accompanied by abdominal pain or cloudy dialysate fluid in peritoneal dialysis patients.
• Severe, unrelenting headache, dizziness, or visual disturbances (indicative of acute hypertensive crisis).

13. Lifestyle and Behavioural Considerations

Managing pediatric renal disease requires long-term lifestyle and dietary adjustments tailored to the child's stage of growth and degree of renal functional impairment.

Dietary and Nutritional Adaptation

• Sodium Restriction: Children with nephrotic syndrome, hypertension, or advanced CKD require strict dietary sodium restriction (typically <1.5 to 2.0 grams/day) to minimize fluid retention and hypertension (IPNA 2022).
• Protein and Electrolyte Balancing: In chronic kidney disease stages 3–5, precise regulation of dietary potassium, phosphate, and fluid intake is necessary. Phosphate binders are administered with meals to prevent secondary hyperparathyroidism. Protein intake must meet baseline growth requirements without excessive hyperfiltration load.
• Fluid Management: Oliguric patients require strict fluid restriction calculated as insensible fluid losses plus daily urine output, whereas patients with polyuric tubulopathies (e.g., nephrogenic diabetes insipidus) require free access to high volumes of water.

Physical Activity and School Participation

Children with stable kidney disease or nephrotic syndrome in remission are encouraged to participate in standard school activities and regular non-contact sports. High-impact contact sports (e.g., rugby, American football) are restricted in children with a solitary functioning kidney, polycystic kidney disease, or a pelvic kidney transplant to prevent traumatic abdominal injury.

14. How Outcomes Are Measured

Clinical success and outcomes in pediatric nephrology are assessed using quantifiable biological endpoints, longitudinal growth tracking, and standardized disease activity indices.

Glomerular Disease Endpoints

In nephrotic syndrome, complete clinical remission is defined as a urine protein-to-creatinine ratio (UPCR) <0.2 mg/mg (or negative/trace protein on dipstick for 3 consecutive days). Partial remission is defined as a UPCR between 0.2 and 2.0 mg/mg with normal serum albumin levels (IPNA 2023). Relapse is defined as UPCR >2.0 mg/mg or 3+ protein on dipstick for 3 consecutive days in a child previously in remission.

Chronic Kidney Disease Endpoints

In pediatric CKD, outcomes are measured by:

• Functional Preservation: Stability of estimated glomerular filtration rate (eGFR) calculated using the Bedside Schwartz formula: eGFR (mL/min/1.73m²) = (0.413 × Height in cm) / Serum Creatinine (mg/dL).
• Growth Parameters: Linear height Standard Deviation Scores (SDS) and growth velocity tracking. Target height SDS is maintained using recombinant human growth hormone when eGFR is <75 mL/min/1.73m² and height SDS is <-1.88 (IPNA 2022).
• Cardiovascular Health: Maintenance of clinic blood pressure <90th percentile for age, sex, and height, verified by 24-hour ambulatory blood pressure monitoring (ABPM) (AHA/IPNA 2022).

15. Recent Advances and Current Standard of Care

Over the past decade, pediatric nephrology has evolved significantly due to advances in molecular genetics, novel biologic therapies, and specialized pediatric dialysis equipment.

Targeted Biologic Therapies

The introduction of B-cell depleting agents (monoclonal anti-CD20 antibodies like rituximab and obinutuzumab) has transformed the management of frequently relapsing and steroid-dependent nephrotic syndrome. Multi-center trials confirm that rituximab significantly extends relapse-free survival and allows complete withdrawal of oral corticosteroids and calcineurin inhibitors in up to 60-70% of dependent children (IPNA 2023 Guidelines).

Genetic Diagnostics and Precision Medicine

Next-generation sequencing (NGS) gene panels now allow rapid identification of single-gene variants causing monogenic nephrotic syndrome (e.g., NPHS1, NPHS2, WT1), atypical hemolytic uremic syndrome (complement factor mutations), and hereditary tubulopathies. Genetic diagnosis prevents unnecessary, ineffective immunosuppression regimens in steroid-resistant patients with structural podocyte mutations (KDIGO 2024).

Cardiovascular Protection and Novel Therapeutics

Ambulatory blood pressure monitoring (ABPM) has become the gold standard for diagnosing masked hypertension in pediatric CKD. Additionally, clinical trials are actively evaluating pediatric safety profiles for novel therapeutic agents, such as sodium-glucose cotransporter-2 (SGLT2) inhibitors and non-steroidal mineralocorticoid receptor antagonists, aiming to provide further nephroprotection alongside traditional RAAS blockade.

16. Common Myths and Misconceptions

Myth: Nephrotic syndrome in children always leads to permanent kidney failure.
Reality: The vast majority (85-90%) of children with idiopathic nephrotic syndrome have minimal change disease, which responds completely to corticosteroid therapy without progressing to permanent kidney failure or end-stage renal disease (IPNA 2023).

Myth: Children with kidney disease should completely avoid all physical activity.
Reality: Exercise is safe and strongly beneficial for children with stable kidney disease, helping to preserve cardiovascular health, bone density, and muscle mass. Moderate physical activity is encouraged, with restrictions limited only to high-impact contact sports in specific anatomical situations.

Myth: Drinking excessive amounts of water can cure or prevent all pediatric kidney conditions.
Reality: While adequate hydration is vital for conditions like urinary tract infections or kidney stones, forced excessive fluid intake does not repair intrinsic glomerular damage or correct congenital structural renal anomalies, and can lead to dangerous hyponatremia in oliguric kidney failure.

Myth: Blood pressure problems only occur in adults, not in children.
Reality: Pediatric hypertension is increasingly recognized and is frequently secondary to underlying parenchymal renal disease or CAKUT. Regular blood pressure screening is recommended annually for all healthy children starting at age 3, and at every visit for those with known kidney conditions (AAP 2022).

Myth: A child who requires peritoneal dialysis cannot attend regular school.
Reality: Automated peritoneal dialysis (APD) is performed overnight while the child sleeps. This leaves the daytime completely free of dialysis exchanges, allowing children to attend school, participate in peer activities, and live a normal daytime routine.

Myth: Corticosteroids used for nephrotic syndrome are the same anabolic steroids used illegally by athletes.
Reality: Corticosteroids (such as prednisolone) are glucocorticoids—anti-inflammatory hormones synthesized naturally by the adrenal glands—which are entirely different in chemical structure and biological action from muscle-building anabolic androgenic steroids.

17. Frequently Asked Questions

What is the difference between adult nephrology and pediatric nephrology?

Pediatric nephrology focuses on kidney disorders in growing individuals from birth through late adolescence. While adult nephrology primarily manages acquired conditions like diabetic nephropathy and essential hypertension, pediatric nephrology deals predominantly with congenital structural anomalies (CAKUT), genetic diseases, and primary autoimmune glomerular conditions like minimal change disease, while placing special emphasis on growth, bone development, and physical maturation.

How is a kidney function test performed on an infant or child?

Kidney function in children is primarily evaluated using specialized blood assays measuring serum creatinine and cystatin C, combined with precise urine protein and electrolyte measurements. Because muscle mass varies significantly with age and body height, clinicians calculate an estimated glomerular filtration rate (eGFR) using pediatric-specific mathematical models, such as the modified Bedside Schwartz formula, rather than relying on standard unadjusted adult reference ranges.

Is a renal biopsy safe for a young child?

Yes, ultrasound-guided percutaneous renal biopsy is a routinely performed, safe diagnostic procedure in pediatric nephrology. The procedure is conducted under deep sedation or general anesthesia so the child experiences no pain or movement. Major complications, such as severe bleeding requiring blood transfusion, occur in less than 0.5% of pediatric cases when performed by experienced pediatric teams (ESPN 2023).

What causes nephrotic syndrome in children?

Nephrotic syndrome is primarily caused by immunological dysregulation that alters podocyte structure within the glomerular filtering units of the kidney, leading to severe leakage of protein into the urine. In 85-90% of pediatric cases, it is classified as idiopathic minimal change disease, which responds effectively to oral corticosteroid therapy. In rare cases under one year of age, it may stem from genetic mutations affecting podocyte structural proteins.

Can a child live a normal life with only one kidney?

Yes, children with a single healthy kidney (renal agenesis or following unilateral nephrectomy) can live a fully normal, healthy life. The remaining single kidney undergoes compensatory hypertrophy, growing larger to undertake the functional workload of two kidneys. Long-term management involves periodic monitoring of blood pressure, microalbuminuria, and overall kidney function, along with avoiding high-risk contact sports to protect the remaining organ.

How long does steroid treatment last for pediatric nephrotic syndrome?

The standard initial course of steroid therapy for a first episode of steroid-sensitive nephrotic syndrome typically lasts 8 to 12 weeks, following international guideline schedules (IPNA 2023). This includes an initial daily high-dose phase followed by a gradual tapering alternate-day dosing phase. If a child experiences frequent relapses, steroid-sparing medications are introduced to prevent long-term steroid toxicity.

What is CAKUT and how is it diagnosed?

CAKUT stands for Congenital Anomalies of the Kidney and Urinary Tract. It represents a spectrum of structural birth defects, including renal dysplasia, hydronephrosis, ureteropelvic junction obstruction, and vesicoureteral reflux. CAKUT is typically detected initially on routine prenatal screening ultrasound scans and confirmed postnatally using high-resolution ultrasound, voiding cystourethrogram (VCUG), or nuclear medicine scans (DMSA/MAG3).

What are the early warning signs of kidney disease in children?

Early warning signs of pediatric kidney disease include puffiness around the eyes (especially in the morning), swelling of the feet or ankles, dark red or cola-colored urine, unexplained foamy urine, unexpected changes in urination frequency, unexplained fever, poor linear growth, loss of appetite, and unexplained elevated blood pressure during routine health checks.

How does kidney disease affect a child's growth and puberty?

Chronic kidney disease can impair linear growth and delay pubertal development through chronic metabolic acidosis, renal osteodystrophy (disturbed calcium-phosphate balance), persistent anemia, and resistance to circulating growth hormone. Modern pediatric nephrology protocols actively correct these metabolic disturbances early and utilize recombinant human growth hormone to maintain normal height velocity (IPNA 2022).

What is the best dialysis option for a young child with kidney failure?

Automated Peritoneal Dialysis (APD) is generally the preferred modality for young children with end-stage renal disease. It is performed at home while the child sleeps, eliminating the need for frequent hospital visits, avoiding repeated vascular access needle punctures, preserving residual kidney function longer, and allowing uninterrupted daytime school attendance and normal social activities.

Can a child receive a kidney transplant from an adult donor?

Yes, children can successfully receive a kidney from an adult donor, such as a parent or relative. Surgeons place the adult-sized kidney into the child's iliac fossa or retroperitoneum, connecting the renal blood vessels to the child's iliac or abdominal aorta and inferior vena cava. Adult donor kidneys provide excellent, durable long-term renal function in pediatric recipients.

Are there any dietary restrictions for children with early-stage kidney disease?

In early-stage kidney disease (CKD stages 1–2), dietary restrictions are often minimal, focusing mainly on moderate sodium reduction to assist blood pressure control and edema prevention. As kidney function declines to stages 3–5, specialized renal dietitians tailor specific dietary plans to regulate potassium, phosphate, and protein levels while ensuring high-calorie intake to support normal childhood growth.

How often does a child with chronic kidney disease need to see a specialist?

Monitoring frequency depends on the stage and stability of the condition. Children with stable early-stage CKD or in full nephrotic syndrome remission are typically evaluated every 3 to 6 months. Children with advanced CKD, those undergoing active medication titrations, or post-transplant patients require more frequent visits, ranging from weekly to monthly, combined with routine laboratory monitoring.