title: Fasting urinary calcium/creatinine and hydroxyproline/creatinine values in young women with amenorrhoea and in matched eumenorrhoeic controls.
abstract: The present study was undertaken to compare fasting urinary calcium/creatinine (Ca/Cr) and hydroxyproline/creatinine (HP/Cr) values in young amenorrhoeic women with those of age and weight-matched menstruating women and to see whether restoration of menstruation would influence values. Thirty amenorrhoeic patients were matched with 30 controls. Higher Ca/Cr (0.393 (SD 0.213) vs 0.142 (0.89), p less than 0.001) and HP/Cr (0.025 (0.005) vs 0.020 (0.007), p less than 0.005) values were found in patients with hyperprolactinaemia or hypothalamic dysfunction associated with weight loss, anorexia nervosa or excessive exercise (n = 20), suggesting excessive bone loss in these amenorrhoeic patients, who are frequently oestrogen deficient. Furthermore when 9 amenorrhoeic patients with hypothalamic dysfunction became eumenorrhoeic their urinary Ca/Cr values fell (p less than 0.02). However, amenorrhoeic patients with polycystic ovaries (n = 10) had similar Ca/Cr and HP/Cr values as their controls. It is therefore probable that amenorrhoeic patients with polycystic ovaries are not at risk of osteopenia. The present findings suggest measurements of fasting urinary Ca/Cr and HP/Cr values are likely to prove useful in identifying patients with amenorrhoea who are rapidly losing bone, and in assessing their responses to therapy.
authors.affiliation: Department of Medicine, University of Otago Medical School, Dunedin.
authors.forename: A
authors.initials: A
authors.lastname: Goulding
authors.forename: B G
authors.initials: BG
authors.lastname: Rae
authors.forename: R
authors.initials: R
authors.lastname: Bland
mesh_terms: D000328:Adult; D000568:Amenorrhea / Q000209:etiology / Q000652:urine*; D002118:Calcium / Q000652:urine*; D003404:Creatinine / Q000652:urine*; D005215:Fasting / Q000652:urine*; D005260:Female; D006801:Humans; D006909:Hydroxyproline / Q000652:urine*; D006966:Hyperprolactinemia / Q000150:complications; D007027:Hypothalamic Diseases / Q000150:complications; D010900:Pituitary Diseases / Q000150:complications; D011085:Polycystic Ovary Syndrome / Q000150:complications
chemical_list: D003404:Creatinine; D006909:Hydroxyproline; D002118:Calcium