Vitamin A Liver Reserves and Serum Markers of Vitamin A in US Adults at Time of Death
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ClinicalTrials.gov Identifier: NCT03305042
Recruitment Status :
First Posted : October 9, 2017
Last Update Posted : October 17, 2017
University of Wisconsin, Madison
National Institute on Deafness and Other Communication Disorders (NIDCD)
Minimal human data exist on actual liver vitamin A compared with blood biomarkers. One blood biomarker, the percent of total serum retinol (vitamin A) in the form of retinyl esters, has been suggested to diagnose hypervitaminosis A with cutoffs of 5% and 10%. In this study, investigators aim to compare total liver vitamin A reserves with the percent total serum retinol as retinyl esters to evaluate hypervitaminosis A using autopsy samples from US adults. Investigators also evaluate the sensitivity (the ability of the biomarker to correctly identify those with deficiency) and specificity (the ability of the biomarker to correctly identify those without deficiency) of serum retinol to determine vitamin A deficiency, variation of liver vitamin A concentration among lobes, and liver alpha retinyl ester concentrations, a cleavage product of alpha-carotene, a vitamin A precursor. To conduct the study, matched serum and liver samples were procured from 27 US adult cadavers (from donors age 49-101 years) and their vitamin A biomarkers were analyzed.
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Ages Eligible for Study:
21 Years and older (Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
US adult cadavers from the the National Disease Research Interchange service age 21 years and older, death from any cause.
Human liver and serum samples were acquired as a consecutive sample through a request to the National Disease Research Interchange service, based on sex and age range targets (5 male and 5 female per age group; age groups: 21-54 ; 55-74; 75 and above).