Quantifying human calcium absorption using pharmacokinetic methods

Robert P. Heaney

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Calcium absorption was measured simultaneously by tracer and pharmacokinetic methods in 12 men. The purpose of the study was to calibrate the area under the curve (AUC) for absorptive calcemia to permit comparison or pooling of pharmacokinetic data with tracer-derived estimates. Each subject was studied twice during intake of 500 mg calcium loads (as the carbonate salt), once without excipients, and once with a binder that impeded dissolution of the salt, reducing its absorbability and thereby providing a broad range of absorption values over which to calibrate the method. Various time periods were evaluated, with the best prediction being given by the AUC for the increment in serum calcium calculated over 9 h (AUC9). For net absorbed calcium (mmol) the relationship was given by 4.358 × AUC9 ± 0.820. The empirical regression coefficient was significant and the error of the estimate (0.820 mmol) acceptably small.

Original languageEnglish
Pages (from-to)1224-1226
Number of pages3
JournalJournal of Nutrition
Volume133
Issue number4
StatePublished - Apr 1 2003

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pharmacokinetics
Pharmacokinetics
Calcium
calcium
Area Under Curve
tracer techniques
Salts
salts
hypercalcemia
Excipients
Carbonates
Hypercalcemia
methodology
carbonates
Meta-Analysis
prediction
Serum

All Science Journal Classification (ASJC) codes

  • Food Science
  • Medicine (miscellaneous)

Cite this

Quantifying human calcium absorption using pharmacokinetic methods. / Heaney, Robert P.

In: Journal of Nutrition, Vol. 133, No. 4, 01.04.2003, p. 1224-1226.

Research output: Contribution to journalArticle

Heaney, Robert P. / Quantifying human calcium absorption using pharmacokinetic methods. In: Journal of Nutrition. 2003 ; Vol. 133, No. 4. pp. 1224-1226.
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