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IT has been known for many years that postural changes affect the plasma volume and the concentration of certain blood constituents.1 2 3 4 5 6 In healthy subjects, the plasma volume decreases whereas the concentrations of certain nonfiltrable blood constituents increase on change from the recumbent to the upright position, and these alterations are reversed on reversal if the postural positions. Little account has been taken of such effects in clinical work. The importance of such changes became apparent during a study of the serum lipid responses during glucose tolerance tests in which numerous sequential samples were taken. This report describes the rapidity, magnitude . . .
Tan et al. (Thu,) studied this question.
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