how accurate are ultrasounds in dating gestational age? can they be off by 5 days? my doc said by up to a week, anybody know from personal experience?
2007-09-26 07:47:49 · 13 answers · asked by baby number 1 2 in Pregnancy & Parenting ➔ Pregnancy
paternity test/DNA only sure thing. Ultrasounds are not always accurate. Alot of factors can affect it
2007-09-26 07:51:29 · answer #1 · answered by Anonymous · 1⤊ 1⤋
I think if you had sex with two different people within 5 days of each other and don't know which one is the daddy, you are going to have a lot of problems.
Typically, the ultrasound is extremely accurate in dating the pregnancy, the most accurate time being between 18-20 weeks.
Good luck
2007-09-26 07:52:30 · answer #2 · answered by ChefMel 5 · 1⤊ 0⤋
No they can not be used to determine paternity. Especially as close as 5 days. Sperm can live inside of you for up to 5 days, so honestly you will HAVE to get a dna test.
Please take this as a lessoned learned, and let both men know.
I posted a like below to a paternity site. It has a calculator, and will give you the propable time of conception, and you can match the dates from there.
Good Luck.
http://www.genetree.com/resource/conceptionCalculator.php
2007-09-26 09:54:54 · answer #3 · answered by MOMMYS-TWINS-ARE-IN-HEAVEN 4 · 0⤊ 0⤋
I believe Ultra Sounds are the best way to tell. I do not believe they are that accurate. I know it is not the same but they were off with my child's weight by a good 2.5 pounds. The date was off as well but within the 1 week perimeter.
2007-09-26 08:03:11 · answer #4 · answered by Momma Wanda 1 · 0⤊ 0⤋
im guessing you are trying to figure out who the babys dad is.
even if the ultrasound is right, sperm can live in you for up to 5 days, which means either guy could be the father all you can do it wait till you have the baby and get a dna test
2007-09-26 07:53:30 · answer #5 · answered by mommy2408 5 · 0⤊ 0⤋
Mine was off by 4 days. I am a very careful "calendar keeper" and I knew the exact day my husband and I conceived and yet the ultrasound showed us conceiving 4 days earlier :)
It all depends on the size of the baby--mine was a little more developed early on and was born a little early too (though she was fully developed and 7.9lbs at birth :) No chance of my dates being off either--there was certainly no other possible father and I knew when we had sex!
2007-09-26 07:55:59 · answer #6 · answered by Aubrey and Braeden's Mommy 5 · 0⤊ 0⤋
Mine was off by 17 days. So by my lmp i should be due November 26th - but the ultrasound said I wasn't that far along and gave the due date of december 14th.
2007-09-26 07:52:22 · answer #7 · answered by charlie 4 · 1⤊ 0⤋
They can be off by up to a week in the first trimester. After the first trimester they are even less reliable as babies grow at different rates.
2007-09-26 07:51:46 · answer #8 · answered by LatchKeyPrincess 4 · 1⤊ 0⤋
Correction to different poster-you may have CVS or amnio (one or the different) at any time interior the being pregnant. they have hazards, besides the undeniable fact that. i assume you say 5 days because it is the time span on your distinct sex companions. i imagine they're in many circumstances off by utilizing per week, and much relies upon on the adventure of the guy reading the u/s. for 2 examples, i replaced into due January 30. provided that my husband were OUT OF city, and that i did not cheat on him, I knew precisely the earliest we'd want to have conceived. (which handed off to be day 14 of my cycle). in accordance with united stateswellness care professional gave us a a million/22 due date and my husband replaced right into slightly annoying that i replaced into dishonest! the newborn got here FEBRUARY 9! NINETEEN days after his meant due date! Our 2d newborn replaced into an same, we were travelling acquaintances so I knew when we had sex, (when we were given residing house), the wellbeing care professional replaced due date from April 8 to April 2, she got here April 18. This replaced into 2 distinct docs. obviously my childrens have vast leg bones or inspite of, in spite of the actual incontrovertible truth that they are very worry-free sized human beings now. i'm sorry they are not extra precise-that would want to help you! yet i'm afraid you won't be able to appropriately locate out for certain till this newborn is born. sturdy success.
2016-10-20 03:28:47 · answer #9 · answered by ? 4 · 0⤊ 0⤋
Ultrasounds are not an exact science...only bloodwork can truly determine paternity. Good luck.
2007-09-26 07:51:11 · answer #10 · answered by momoftwo 2 · 1⤊ 1⤋