Childhood Nephrotic Syndrome: Steroid Dosing, Biopsy Thresholds, and Immunization
A 5-year-old girl, 18 kg, BSA 0.75 m², presents with 6 days of periorbital edema that has progressed to abdominal distension and labial edema. Blood pressure 96/60; urine output 0.6 mL/kg/h; urine protein 4+ with a protein/creatinine ratio of 8.2; serum albumin 1.6 g/dL; total cholesterol 340 mg/dL; creatinine 0.4 mg/dL; sodium 132 mEq/L; potassium 3.9 mEq/L. She has no gross hematuria, rash, joint complaints, or recent infection. The team plans prednisone, a 2 g sodium diet, scheduled furosemide, IV albumin, and prophylactic penicillin.
1. Write the prednisone regimen and identify which of the other planned interventions you would start, modify, or stop.
Read the worked answer
Prednisone: 60 mg/m²/day = 0.75 m² × 60 = 45 mg once daily (maximum 60 mg/day) for 6 weeks, then 40 mg/m² (30 mg) on alternate days for 6 weeks - 12 weeks total. Give in the morning with food; do not taper below the alternate-day phase unless toxicity demands it. Expect remission (trace/negative protein on 3 consecutive first-morning urines) typically within 2–4 weeks.
Interventions to stop or modify:
- IV albumin - not routine. Reserve for symptomatic hypovolemia (tachycardia, poor perfusion, abdominal pain suggesting thrombosis or hypovolemia) or refractory edema; indiscriminate use causes hypertension and pulmonary edema.
- Scheduled furosemide - stop. Diuresis in an intravascularly depleted child risks acute kidney injury and thrombosis. If edema is severe and the child is intravascularly replete, use a modest dose with close monitoring rather than a standing order.
- Prophylactic penicillin - not indicated for routine steroid-sensitive nephrotic syndrome.
Keep and add: modest sodium restriction (~1–2 g/day, no added salt), fluid restriction only if hyponatremic, daily weight and blood pressure, a proton-pump inhibitor or H2 blocker as gastroprotection for the steroid course, and parent education on infection precautions.
2. Which findings at presentation or during the course would push you toward renal biopsy rather than continued empiric steroids?
Read the worked answer
Empiric steroids are appropriate because this is a classic presentation for a child aged 1–10 years: isolated proteinuria, no hematuria, normal blood pressure, normal creatinine, and normal complement. Biopsy is indicated if any of the following appear:
At presentation:
- Age <1 year or >10–12 years (different disease spectrum, including congenital and genetic forms).
- Gross hematuria or persistent hypertension.
- Low C3 (suggests post-infectious glomerulonephritis or membranoproliferative disease).
- Elevated creatinine unexplained by hypovolemia.
- Extrarenal features: rash, arthritis, cytopenias, positive ANA or hepatitis serologies.
During the course:
- Steroid resistance - no remission after 4–8 weeks of daily prednisone. Biopsy and genotyping follow, and a calcineurin inhibitor (cyclosporine or tacrolimus) or mycophenolate is added.
- Frequent relapses or steroid dependence prompt consideration of a steroid-sparing agent, and many centers biopsy before starting a calcineurin inhibitor.
- Acute kidney injury, macroscopic hematuria, or thromboembolic events.
This child needs no biopsy now - but the plan must include a clear checkpoint at 4 weeks to decide.
3. The family asks about vaccines and about a classmate with chickenpox. How do you counsel them?
Read the worked answer
Live vaccines are contraindicated while she is immunosuppressed. The threshold is prednisone ≥2 mg/kg/day or ≥20 mg/day for ≥14 days. At 45 mg/day she exceeds both. MMR and varicella vaccines must be deferred until she has been off steroids for at least 1 month (or has received a short course of <14 days). Document this clearly and have the school nurse notify the family of exposures.
Varicella exposure: because she is susceptible and immunosuppressed, she needs post-exposure prophylaxis with varicella-zoster immune globulin (or, if unavailable and the exposure is >7 days past, consider acyclovir prophylaxis per local protocol) - not vaccination. Report to the provider within 24 hours of any exposure; chickenpox in a steroid-treated child can be disseminated.
Vaccines that are safe and recommended:
- Inactivated vaccines, including annual inactivated influenza (and influenza vaccination for household contacts).
- Pneumococcal vaccination: ensure PCV is complete; children ≥2 years on prolonged immunosuppression should also receive PPSV23 at least 8 weeks after the last PCV dose, with revaccination per schedule.
- Meningococcal vaccines for children on prolonged high-dose steroids/complement-altering therapy per schedule.
Other counseling: report fever promptly, avoid live-vaccine household members only if they develop a rash after varicella vaccine, and keep a written steroid record for school and emergency visits.