Validation and Simplification of the Retinol Isotope Dilution Technique in Burkinabe Schoolchildren

A group of 60 school children will be recruited through a stratified sampling. To this first group of 60 school children a retinol isotope dilution (RID) test for total body store assessment will be applied. The remaining 98 school children will be recruited according to stratified sampling and divided into two groups of 49 children (females and males). To these groups of children, the modified relative dose response (MRDR) test, a qualitative measure of vitamin A status will be used to investigate the absorption of 3,4-didehydroretinyl acetate in oil.