The stability of vitamin A and retinol-binding protein (RBP) in serum separated from the clot
at different times after blood extraction and the effect of ingesting a vitamin A-rich breakfast …

The micromethod of Besseyet al. 1 for serum vitamin A has been shown to be subject to a
number of errors. The primary difficulty arises from the fact that ultraviolet light not only …

Many problems concerning the human requirement for vitamin A could be solved if a reliable
measure of subclinical vitamin A deficiency were found. The biophotometer test has been …

The effect of ingesting a breakfast rich in vitamin A on postprandial blood serum
concentration of retinol, retinol-binding protein, and carotenoids has been investigated in …

Carotenoids in human tissues were in low and variable concentrations. Approximately 50%
of the total carotenoids was present as carotene. The adrenal was the only tissue that …

The usual or habitual diets of 114 men and 41 women were examined by 3-day diary
recording in 3 studies for from 6 months to 1 year. The average daily intakes of preformed …

Liver samples obtained from subjects who died acute traumatic deaths or who died from
various diseases in metropolitan Washington, DC were analyzed for vitamin A and carotene …

The chemical determination of vitamin A in the blood has been simplified so that it can be
carried out in any clinical laboratory. Apart from the changes of the plasma vitamin A in …

Previous studies using spectrophotometric methods for vitamin A analysis concluded that
fasting prior to blood collection is not necessary for determining vitamin A status of children …

The vitamin A status in 11 generally healthy surgical patients was estimated by measuring
the dilution of a 45-mg oral dose of tetradeuterated retinyl acetate (99% pure). After …