Abstract
Studies of the day to day creatine and creatinine excretion of a number of [male] [male] and [female] [female] , aged 19-26 yrs., revealed the absence of creatinuria in the d1 d1 and its presence, in amts. up to 150 mg./day, in a proportion of the [female] [female] . No evidence was obtained to relate creatinuria, whenever it appeared, to any phase of the menstrual cycle. A weekly periodicity in creatinine excretion was observed, but there was no conclusive evidence to link the level of urinary creatinine with menstruation.

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