Use of Model-Based Compartmental Analysis and Theoretical Data to Further Explore Choice of Sampling Time for Assessing Vitamin A Status in Groups and Individual Human Subjects by the Retinol Isotope Dilution Method.

Results for the 20 theoretical adults ( Figure 2 ) show that there was a highly significant correlation between assigned and RID-predicted TBS, with R 2 increasing from 0.370 at day 4 to 0.992 at day 28; the plot for this group indicates that day 21 or 28 would be an optimal time to do the RID test in adults like these.

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