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Abstract
The blood volume can be measured after labelling of red blood cells with tech-netium-99m. In addition, the blood volume and its standard error of estimate can be calculated from the subject's sex, height and deviation from desired weight. By comparing the measured blood volume with the estimated normal blood volume and using a statistical test, it can be decided whether a measured blood volume is normal or not. This method was applied to a group of 36 patients with heart diseases. Four of the patients had abnormal blood volumes. In the remaining 32 patients the measured blood volumes were equally distributed around the estimated mean normal values. The method described for determination of normal/abnormal blood volumes can be considered a by-product of routine radionuclide cardiography.