This was done by drawing 10cc of blood and labeling the red blood cells with chromium 51. The blood was then injected back into the body, where it distributed equally round the body. Another 10cc of blood was drawn and the chromium 51 level was measured. From this it's possible to work out the amount of blood in the body. This is a very reliable test.
Blood pressure is normal.
Peripheral hematocrits are normal. Proportion of red blood cells to plasma. Even if blood volume is low, hematocrits are normal. In one person, they had half the normal red blood cell volume. Plasma volume - one had a very high level, but it is really changeable, and they had drunk a lot before the test.