An increase in urinary hydroxyproline excretion suggests A E

An increase in urinary hydroxyproline excretion suggests A. Elevated bone turnover. B. Impaired renal amino acid reabsorption. C. Excess dietary protein. D. Excess dietary calcium. E. Elevated renal 25-hydroxylase.

Solution

A. elevated bone turnover

The two most commonly used biochemical markers of bone turnover are the serum alkaline phosphatase and the urinary excretion of peptide-bound hydroxyproline.