A Determination of the Biological Half-Life of 25-Hydroxyvitamin D3 in Beagles
Gengle, Michael J.
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The biological half-life of 25-hydroxyvitamin D3 in four beagles was determined from serum samples using a precise and specific high-performance liquid chromatographic (HPLC) assay. Initial baseline levels ranging from 16.3 to 28.3 ng/ml of serum were established. Single rapid intravenous injections containing 20 rg of 25-hydroxyvitamin D3 were administered. Blood samples were then drawn at specified periods of time, and the serum was separated and assayed. The biological half-life based on a two compartment, single bolus injection model ranged from 28.5 to more than 400 days. The mean half-life for three of the dogs was 43.3 ± 15.0 days. The fourth dog appeared to be an unusual case.