In an adolescent with suspected orthostatic proteinuria, a first-morning urine sample is negative for protein. What is the recommended next step?

In an adolescent with suspected orthostatic proteinuria, a first-morning urine sample is negative for protein. What is the recommended next step?

• A. Reassure parents that it is benign with no follow-up needed.
• B. Order a 24-hour urine collection for creatinine and protein excretion.
• C. Monitor for proteinuria at each annual well-child examination.
• D. Refer the child to a pediatric nephrologist for further evaluation.

Answer: (C)

Orthostatic proteinuria in adolescents typically shows protein in daytime urine but not in the first-morning sample. A negative first-morning result means there isn’t nocturnal protein excretion, which supports a nonpathologic, posture-related proteinuria pattern rather than a persistent glomerular process. Because this condition is usually benign and may resolve with time, the appropriate next step is to monitor for proteinuria at routine annual well-child visits, rechecking as needed. If proteinuria appears again in daytime samples or remains persistent across visits, then more detailed evaluation (such as a daytime/24-hour collection or nephrology referral) would be considered. Reassurance with no follow-up would miss potential progression, a 24-hour collection is not immediately required after one negative morning test, and nephrology referral is unnecessary without persistent abnormalities.

Orthostatic proteinuria in adolescents typically shows protein in daytime urine but not in the first-morning sample. A negative first-morning result means there isn’t nocturnal protein excretion, which supports a nonpathologic, posture-related proteinuria pattern rather than a persistent glomerular process. Because this condition is usually benign and may resolve with time, the appropriate next step is to monitor for proteinuria at routine annual well-child visits, rechecking as needed. If proteinuria appears again in daytime samples or remains persistent across visits, then more detailed evaluation (such as a daytime/24-hour collection or nephrology referral) would be considered. Reassurance with no follow-up would miss potential progression, a 24-hour collection is not immediately required after one negative morning test, and nephrology referral is unnecessary without persistent abnormalities.