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A 40-year-old female asked:

why is it so hard to find out normal urine creatinine and calcium levels for a 5 yr old if 3, 3 creatinine , 2.4 calcium..what is norm ? shud i worry?

2 doctor answers4 doctors weighed in
Dr. Pierrette Mimi Poinsett
Pediatrics 38 years experience
Need clarification: Is this based upon a "spot urine" single sample or a 24 hour urine collection? Also lab values are best discussed with your child's physician.
Dr. Ed Friedlander
Pathology 44 years experience
Worthless number: The total creatinine put out varies primarily with the total mass of skeletal muscle. You'll never find a "normal" value for either. The concentration is even more variable as it depends on how much water was drunk. The urine creatinine is measured only as something to compare with a semi-constant, the creatinine. People aren't numbers, and we do a disservice focusing on labs apart from history.

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Last updated Feb 6, 2015

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