Application of ⁴²K Labelled Red Corpuscles in Blood Tolume Measurements.

Abstract

Summary. Red corpuscles were labelled by adding 42 KC1 to a blood sample kept at 37 o C for 2 hrs. When reinjecting the blood sample to the patient in the course of 1 hr, within the error of the blood volume determination which is 3 %, no change in the activity of the red corpuscles could be observed. Washed labelled red corpuscles injected into the circulation lost in the average 3.5 % of their 42 K content in the course of the first hr., while the mean loss per hour in the course of 24 hours was found to be 2.1 %.