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The effect of dietary control on the day-to-day variation in total hydroxyproline excretion has been examined in two studies. In the first, a normal volunteer ate a controlled diet containing varying gelatin supplements for several weeks. In the second, the effect of removing hydroxyproline-containing foods from the diets of 8 volunteers was examined. Both studies confirm that the day-to-day variation in total hydroxyproline excretion falls when the gelatin content of the diet is decreased, whether the results are expressed as total hydroxyproline excretion rate or as the total hydroxyproline: creatinine ratio. This fall in variation takes place within 24 h of dietary control beginning and therefore longer periods of dietary restrictions to achieve optimum precision in the measurement of total hydroxyproline are unnecessary. For some analytical methods, results are better expressed as the ratio total hydroxyproline:creatinine than as the total hydroxyproline excretion rate.
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Revista medica de Chile,
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Verhandlungen der Deutschen Gesellschaft fur Rheumatologie,
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