Abstract
In normal blood plasma the average value of vitamin A was 152±10 I.U.%, and that of carotene 50±7μg%. In the vitamin A tolerance curve, the highest peak was observed after 5 hours. The vitamin A content of whole blood varied from 51 to 58% of that in plasma. In liver diseases and in several pulmonary tuberculosis, the plasma vitamin A level was lowered. The reduction took place correspondingly to the degree of liver damage, but not to that of jaundice. In renal diseases, the vitamin A level was often increased considerably.
