Investigations into the influence of posture on renal plasma flow and glomerular filtration rate during late pregnancy.

Renal plasma flow and glomerular filtration rate were investigated in three positions (supine, left lateral and sitting) in a group of eighteen healthy women during late pregnancy and again after the puerperium. No difference in renal function could be attributed to the position adopted. However, an unexplained decrease in both of the indices occurred during the course of prolonged infusion in any position.