[Fasting urinary excretion of calcium, phosphorus and hydroxyproline in relation to creatinine. Normal values and...

The ratios to creatinine of calcium (Ca/Cr), phosphorus (P/Cr) and hydroxyproline (HOP/Cr) were determined in samples of urine collected during a 2-hour period in fasting subjects. Normal values (mean +/- s.d.) of Ca/Cr (0.134 +/- 0.067), P/Cr (0.048 +/- 0.15) and HOP/Cr (0,017 +/- 0,007) obtained in 50 healthy subjects were in agreement with those previously reported by Nordin. The 2-hour urine collection is technically simpler than the conventional 24-hour urine collection, does not expose to the errors inherent in minuted urine collection and provides more information on bone diseases.