Determination of the retention of Ca-47 by whole-body counting

Retention of intravenously or orally administered Ca-47 in the human body a re described by a two-parameter function. It is then sufficient to make onl y a few whole-body measurements to determine the retention function, avoidi ng faeces sampling and stool markers. Seven days after intake the non-absor bed calcium was excreted and the model agreed with the measured relative re tention. Absorption of calcium could then, in some cases (e.g. comparative studies), be described by relative retention at the 7th day after intake. ( C) 2000 Elsevier Science Ltd. All rights reserved.