How do doctors estimate fetal weight in the 3rd trimester?
- Saturday Nov 21,2009 04:33 PM
- By diddy
- In Others
I just wonder what doctors go on to estimate the weight of the fetus. I’ve heard that sometimes doctors are quite far off in these determinations (as much as 2 lbs off) so I just wonder how they estimate this to start with. Also (if anyone knows) how often are doctors wrong when predicting the sex of the baby with an ultrasound?
Thanks!
3rd Trimester, Determinations, Doctors, Fetal Weight, Fetus, Sex Baby, Sex Of The Baby, Ultrasound
3 Comments
manily…they guess. i was due may 2nd…that very day the doc told me my son would be 7 1/2 lbs. 7 days later i had him and he was 9lbs 12oz!!! i can understand a few oz off but 2lbs?? yea right!!!
weight in utero is calculated from weight of various organs in aborted fetuses. while its still in there u just add up the weight of the organs based on the age. and docs arent often wrong about the sex even when just using ultrasound but u can have a dna test done to find out for sure
i had a growth scan done at 31weeks and they took all the babies measurements again just like the 20week scan and when they put it all into the computer the computer then used all the measurements to estimate the babies weight. the baby was right on target according to the measurements and im guessing that they can be wrong because even though the baby was the correct length doesn’t mean that all babies are the same weight at that stage. they also confirmed the sex to be male and im guessing theres a higher chance of getting it wrong if you only have one scan and its earlier in pregnancy as then they cant see the sex organs as clear.
good luck!
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