title: Hydroxyproline/creatinine ratios as estimates of bone resorption in early postmenopausal women. Fasting and 24-h urine samples compared.
abstract: Ratio of urinary hydroxyproline/creatinine excretion is often used as an index of bone resorption. To establish the difference between the fasting urinary content (FU-HPR/CR) and the 24-h urinary excretion (24 h-U-HPR/CR) we determined hydroxyproline and creatinine in specimens from a group of early postmenopausal women. One hundred and eighty-six early postmenopausal women were randomized into 10 groups receiving various doses of sequential female sex hormones and/or 1,25(OH)2D3, 0.25 microgram per day, or placebo. In all groups there were parallel changes of FU-HPR/CR and 24 h-U-HPR/CR, and in all groups treated with oestrogens the values decreased significantly. The changes in FU-HPR/CR were more pronounced than in the 24-h-U-HPR/CR, which indicates that FU-HPR/CR is a more sensitive marker of changes in bone resorption. The strong correlation between the mean values of 24-h-U-HPR/CR and those of FU-HPR/CR suggests that both methods are convenient for evaluating changes during long-term studies in groups of patients. The correlation on an individual basis is weak. The substantial intraindividual variation in 24-h-U-HPR/CR, (34.6%) indicates that FU-HPR/CR (CV = 17.0%) is the more valid variable for individual patients.
mesh_terms: D001862:Bone Resorption / Q000187:drug effects*; D002986:Clinical Trials as Topic; D003404:Creatinine / Q000652:urine*; D004311:Double-Blind Method; D004338:Drug Combinations; D004958:Estradiol / Q000494:pharmacology; D004964:Estriol / Q000494:pharmacology; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D006801:Humans; D006887:Hydroxycholecalciferols / Q000494:pharmacology*; D006909:Hydroxyproline / Q000652:urine*; D008593:Menopause / Q000187:drug effects*; D008875:Middle Aged; D009640:Norethindrone / Q000494:pharmacology
chemical_list: D004338:Drug Combinations; D004967:Estrogens; D006887:Hydroxycholecalciferols; D004958:Estradiol; D003404:Creatinine; D004964:Estriol; D006909:Hydroxyproline; D009640:Norethindrone