WOMENS-HEALTH Messages for May, 1997: Re: Counting weeks of pregnancy

Re: Counting weeks of pregnancy

From: Harvey S. Marchbein, M.D. (anonymous@obgyn.net)
Thu, 8 May 1997 20:38:12 -0500 (CDT)

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In reply to: Kristi: "Counting weeks of pregnancy"

At Thu, 8 May 1997, Kristi wrote: >
>Why are the approximately 40 weeks of pregnancy counted starting from
>the day of the last normal menstrual period, rather than the date of
>conception which would be about 38 weeks? I've noticed a high
>correlation with the fundal height in cm with the week of pregnancy, but
>didn't really know if their was a relationship or was just a
>coincidence.
>
>Also, why are pregnant women advised to lie & sleep on their left side?
>Is it because the uterine artery is on the right?
>
>Just curious...I always seem to have a zillion questions. Thanks!

Hi Kristi, Welcome back t the forum. 40 weeks from the last menstrual period was a determination that was made BEFORE the nature and timing of ovulation was known with respect to regular vs. irregular cycles, etc. We all know that 40 weeks of pregnancy is 38 weeks from ovulation. This is known and accepted by all professionals. Sonograms are also interpreted with this in mind.

Cool the way the fundal height is approximately equivalent to the number of weeks, huh!

Pregnant women acan sleepany way they want. Optimum position for resting is on the left side because that will get the uterus of the aorta and maximize blood flow to the uterus. When you sleep, you change positions 60-80 times a night. The only way to sleep on your left side (which would be rather uncomfortable long term) would be to wedge pillows front and back. Yuck!

Be well and stay well.

-- Harvey S. Marchbein, M.D. FACOG, FACS OBGYN.net U.S. Representative, New York Great Neck, New York http://www.obgyn.net/states/bios/marchbein.htm http://www.obgyn.net/women/heroes/harveym.htm

*Note: Opinions expressed here are for educational purpose only. This information is not intended to supplant the need for you to consult with your physician prior to choosing therapeutic options.

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