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Clinical Chemistry 39: 2040-2052, 1993;
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Clinical Chemistry, Vol 39, 2040-2052, Copyright © 1993 by American Association for Clinical Chemistry

Urinary selenium concentrations

M Sanz Alaejos and C Diaz Romero
Department of Analytical Chemistry, Food Science, and Toxicology, University of La Laguna, Tenerife, Spain.

Urinary selenium concentrations are used as an indicator of selenium status. A strong correlation has been established between dietary selenium and daily urinary selenium excretion in a wide range of populations from all over the world with different dietary selenium intake. Data on urinary selenium concentrations in healthy individuals and patients with different pathological conditions are reviewed. Selenium excretion rates of 20-200 micrograms/day are not associated with deficiency or toxicity problems. Urinary Se excretion is decreased in children, elderly people, and pregnant women. Workers exposed to heavy metals, and cancer patients, have higher and lower urinary Se concentrations, respectively, than control groups. The trimethylselenonium ion, a minor metabolite of Se in urine, assumes a significant role only in the detoxification of excess Se intake. Studies of bioavailability and balance show the important role of the kidneys in homeostatic regulation of Se.


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