Dilution curve of the dye T-1824 has been studied in eleven patients with central arteriovenous shunts; also in a case of venous-arterial bypass; one carrying an abdominal aortic aneurysm; a patient in congestive heart failure before and during treatment, and two normal subjects in whom errors in technique (puncture of the femoral vein; injection rebound) was committed.

We have noted the normal values ​​of sodium and potassium in the serum of 50 normal subjects. The method employed was the flame photometer. Suggest the use of the technique and fast anaerobic whey separation in handling blood samples