title: A simplified isotope dilution procedure for the assessment of vitamin A status in rats.
abstract: In four separate experiments, rats with liver reserves of vitamin A ranging from deficient to high were administered physiological doses (5, 10 or 20 micrograms) of [11,12-3H] retinol, either by gastric intubation or intraperitoneal injection, and sacrificed after either 7 days or 5 hours. Measurements were then made of radioactivity and vitamin A in plasma and liver. In all four experiments there was a highly significant negative correlation between the logarithm of the specific activity of plasma vitamin A and the logarithm of total liver vitamin A.
mesh_terms: D000818:Animals; D008099:Liver / Q000032:analysis; D008297:Male; D011865:Radioisotope Dilution Technique; D051381:Rats; D011919:Rats, Inbred Strains; D014801:Vitamin A / Q000008:administration & dosage / Q000032:analysis* / Q000097:blood / Q000494:pharmacology; D014802:Vitamin A Deficiency / Q000175:diagnosis
chemical_list: D014801:Vitamin A