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Re: amniotic fluid volumesFrom: ainsron (ainsron@sbcglobal.net)Mon Jun 12 17:54:46 2006
Looks like the best reference is Chamberlain, Manning, et.al; Ultrasound evaluation of amniotic fluid volume, Am J Obstet Gynecol, 1984; 150:245-249. The classic article on Amniotic fluid volume in pregnancy is by Queenan, also in Am J Obstet Gynecol, 114: 34, 1972. There is a good graph in his book, Management of High-risk pregnancy. It shows amniotic fluid volume peaking around 34wks, with a mean of ~900 and a range of 400-1300 mL (+ or - 1 SD). How long it takes to reaccumulate depends on pathologic process. He states that the fetus produces 43 mL of urine per hour and the average exchange between mother and fetus is 3600 mL per hour, according to studies from 1959 by Hutchinson. Ronald E. Ainsworth, MD, FACOG -----Original Message----- From: ob-gyn-l@obgyn.net [mailto:ob-gyn-l@obgyn.net] On Behalf Of Charlie Chambers Sent: Monday, June 12, 2006 12:57 PM To: Multiple recipients of list OB-GYN-L Subject: amniotic fluid volumes I'm trying to correlate AFI's to true amniotic fluid volume. Does anyone know of a reference for such info? Also, what would be the range of normal true volume at term? And lastly, if one performs a reduction amnio, over what length of time does the fluid reaccumulate? Thanks for the help. I couldn't find it in my references. *************************************************************************
-- Charlie Chambers
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