title: Fractional intestinal absorption and retention of calcium measured by whole-body counting. Application of a power function model.
abstract: By application of a power function model, fractional intestinal calcium absorption was investigated with a new technique involving whole-body counting after successive oral and intravenous administration of standard doses of 47Ca. The fractional calcium retention 7 days after the oral load of 47Ca was also measured. Fractional calcium retention averaged 30.3% in normal subjects and 11.5% in 11 patients with intestinal malabsorption. In the same groups fractional calcium absorption averaged 46.6% and 16.4%, respectively. Fractional calcium retention and intestinal calcium absorption were significantly correlated to body surface area, and there was a well-defined relation between fractional retention and absorption of calcium...
mesh_terms: D000328:Adult; D000368:Aged; D002118:Calcium / Q000097:blood / Q000378:metabolism*; D002132:Calcium Radioisotopes; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008286:Malabsorption Syndromes / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D014915:Whole-Body Counting / Q000379:methods
chemical_list: D002132:Calcium Radioisotopes; D002118:Calcium