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Overview :
Excretion of creatinine in the urine can be used to estimate
lean body mass. Since urinary creatinine excretion may vary from day, the
average daily excretion over several days should be used. The authors are from
the University of Rochester in New York.
Method:
(1) No dietary
restrictions are required, although it probably should be fairly stable without
wide swings in meat ingestion.
(2) The subjects ranged in age from 8 to 71 years. There
were 21 males and 13 females.
(3) Timing of
the urine collections need to be accurate. The urine specimens need to
collected completely and stored at 4°C during the collection period.
(4) Urine is
collected over 3 or more days and the average urinary creatinine excretion is
calculated.
lean body mass in kilograms =
= (0.02908 * (urine creatinine in mg per day)) + 7.38
Limitations:
• The lean body mass is an approximation.
• Other methods are faster, cleaner and/or more accurate.
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