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Doctor insights on: Pregnancy Calculator By Ultrasound Date

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Dr. Michael Gabor
2,271 Doctors shared insights

Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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I had unprotected sex november 16, 2013 everytime I put that into a online pregnancy calculator under "date of conception" its says im 4 weeks. Why?

I had unprotected sex november 16, 2013 everytime I put that into a online pregnancy calculator under "date of conception" its says im 4 weeks. Why?

Easier calculation: Every pregnancy dating software is based on a 40 week pregnancy. Actually the pregnancy is not 40 weeks but 38 weeks. Not every women knows when they conceive but women know when their last menses occurs. Therefore the dating is from the last menses artificially adding 2 weeks to every pregnancy. ...Read more

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How do 9 week transvaginal ultrasounds date a pregnancy?

How do 9 week transvaginal ultrasounds date a pregnancy?

By measuring the: Size of the fetus and the size equates with weeks gestation. ...Read more

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Can longer implantation time affect dating ultrasounds in early pregnancy? Can it affect growth estimates in early pregnancy and date you behind?

Can longer implantation time affect dating ultrasounds in early pregnancy? Can it affect growth estimates in early pregnancy and date you behind?

"Dating" a fetus: The "dating" refers to the gestational age of the developing fetus not a social romantic encounter. Ultrasounds are only accurate plus or minus 2 weeks gestation unless done serially. (more than one). 'That is why OB MD's use multiple parameters to date pregnancies including LMP (last period), pelvic exam uterine size, etc. "Dating" is an inexact science in life and medicine. ...Read more

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How accurate are ultrasounds for dating pregnancy what's the margin of error. If my due date is oct 31, what are the dates I could have gotten pregnant?

How accurate are ultrasounds for dating pregnancy what's the margin of error. If my due date is oct 31, what are the dates I could have gotten pregnant?

What year?: It would seem that you would have to conceive on feb. 8, 2014 to give birth on 10/31. If the question is of historical interest, I would need to know when the ultrasound was done. Otherwise, you might want to check the dates you provided. ...Read more

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When 1st trimester ultrasounds date pregnancy how do they base the gestational age? Do they assume conception occured on cd14?

When 1st trimester ultrasounds date pregnancy how do they base the gestational age? Do they assume conception occured on cd14?

US: First trimester ultrasound is based on biometric measurements only, the embryonic crown-rump length, which is extremely reliable when done by a skilled sonographer. No assumptiosn need be made at all. The ega is however reported correctly, by convention, from the first day of a hypotehtical last menstrual period; so in that regard it 'assumes' conception on cd 14. ...Read more

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How find out expected date of pregnanacy by using ultrasound?

How find out expected date of pregnanacy by using ultrasound?

Standard measures: This is a complicated topic and dependent on how far along you are. Ask the doctor who will be performing your ultrasound. ...Read more

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How I know expected date of gestation by ultrasound?

How I know expected date of gestation by ultrasound?

Measurements: Depending on who big the fetus is, different parts are measured that show how many weeks pregnant you are. ...Read more

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Why would an ob change your due date from an ultra sound taken at 9 weeks of pregnancy but not mention until 3 days beore said due date?

Why would an ob change your due date from an ultra sound taken at 9 weeks of pregnancy but not mention until 3 days beore said due date?

Common: Bonnie, it is very common to revise the due date based on ultrasound evidence, because it is much more accurate than the first day of your last period. Why they didn't mention it earlier, I can't say, but remember that guessing a due date is an inexact science. Only 5% of babies are actually born on their due date. Hope this helps! ...Read more

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My first sonogram of 8 weeks and 2 days of pregnancy says my due date is sept.17, 2013. Could I have conceived between dec.15 and dec.26 of 2012?

My first sonogram of 8 weeks and 2 days of pregnancy says my due date is sept.17, 2013. Could I have conceived between dec.15 and dec.26 of 2012?

Around xmas: If you estimated due date on 09/17/2013 that makes your LMP around 12/11/2012, usually you get pregnant about 2 weeks after your period so most likely you conceived around xmas 12/25. ...Read more

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How accurate are clearblue digital pregnancy test with conception calculator?

How accurate are clearblue digital pregnancy test with conception calculator?

Positive test: They are accurate to determine if you are pregnant or not but not very accurate to give you the date of conception. ...Read more

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Is it ok to have ultrasound free pregnancies? I heard ultrasound can harm unborn children.

Is it ok to have ultrasound free pregnancies? I heard ultrasound can harm unborn children.

Yes: Certainly, you can request not to have any ultrasounds during your pregnancy. However, ultrasound has been used for decades and there are no known consistent health risks to a developing fetus. They are safe. Ultrasound is an easy way to look for potential health issues which may be addressed before delivery, or at least can be anticipated for intervention after delivery. Trust your ob. ...Read more

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How common are partial molar pregnancies among Caucasians? Can they be picked up on a an ultrasound at 5 weeks gestation? Possible signs?

How common are partial molar pregnancies among Caucasians? Can they be picked up on a an ultrasound at 5 weeks gestation? Possible signs?

1:1500: The incidence of a molar pregnancy is about 1 in 1500. If you've previously had a molar pregnancy, its about 1 in 150. In early pregnancy, the symptoms are much the same as a normal pregnancy. Sometimes you can have spotting or more severe nausea and vomiting. U/S at 5 weeks is not always reliable for ruling out molar pregnancy. Best wishes! ...Read more

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Had sex on the 4th and my fertile days start till 6-11 acording to the fertility calculator. A condom was used is there any risk of pregnancy?

Had sex on the 4th and my fertile days start till 6-11 acording to the fertility calculator. A condom was used is there any risk of pregnancy?

Very unlikely: While it is technically possible to get pregnant on any day of the menstrual cycle, this is true because a person doesn't know when she ovulated. If your periods are regular, your fertility calculator should be quite accurate. Since you had sex, with contraception, outside of this time window your risk of pregnancy is very low, probably not more than 1%. ...Read more

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How many ultrasounds will I have during my pregnancy?

How many ultrasounds will I have during my pregnancy?

Varies: Most women will have one ultrasound in the first trimester to verify dating and possibly as part of a special early screening for chromosomal abnormalities. A detailed second trimester ultrasound (around 20 weeks)is typical to look for any fetal abnormalities. Any additional ultrasounds will vary depending upon the specific circumstances of your pregnancy. ...Read more

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How often should you get ultrasounds during pregnancy?

How often should you get ultrasounds during pregnancy?

Depends: There is debate about ultrasound in pregnancy. until the 1980s Ultrasound was not available, and women still had babies.

If there are no problems with the pregnancy, Many suggest a Fetal survey at about 19 weeks.

More scanning, only if there is a problem. However, there is a lot of variability in opinion. ...Read more

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Can having too many ultrasounds during pregnancy be linked to autism?

Can having too many ultrasounds during pregnancy be linked to autism?

Not that I know: I have not seen any research that shows a link between ultrasounds in pregnancy and autism. Ultrasound is a valuable tool to use in ob, (check dates, position of placenta, growth of baby), but sometimes it is overdone, because it is risk free, and parents like to see pictures, and drs. Like to 'make sure' they are not surprised. It's a wonderful tool, that sometimes is used to much imho. ...Read more

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For a normal pregnancy, how many ultrasounds are done and when are these done?

For a normal pregnancy, how many ultrasounds are done and when are these done?

Let me advise you: Fetal ultrasound is often done during the first trimester to confirm and date the pregnancy and again during the second trimester — between 18 and 20 weeks — when anatomic details are visible. If your baby's health needs to be monitored more closely, ultrasounds might be repeated throughout the pregnancy. ...Read more

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Are ultrasounds can be dengerous to the baby when it is being done monthly during pregnancy (ob visits)?

Are ultrasounds can be dengerous to the baby when it is being done monthly during pregnancy (ob visits)?

Not likely: Why monthly? If there is a problem needing close follow-up this makes sense. Ask your doctor why. But I know of no good evidence that ultrsound exams are any risk to the unborn infant. ...Read more

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I've had total 7 ultrasounds with my pregnancy beacuse of bleeding I had is it true its bad for the baby iam having another coming up to see gender?

I've had total 7 ultrasounds with my pregnancy beacuse of bleeding I had is it true its bad for the baby iam having another coming up to see gender?

Safe when done right: My understanding of ultrasounds is that when they're done properly, they are safe. Ultrasounds are not like x-rays in which radiation is used. If an ultrasound probe is left in one spot for a very extended period of time, it could potentially raise the temp of the scanned tissue, but it is unclear if that has any ill effect. Recommend you pose this good? To the radiologist before the next u/s. ...Read more

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What number of ultrasounds is too many during pregnancy?

What number of ultrasounds is too many during pregnancy?

The # of ultrasounds: Can vary by situation. For instance - some women with particular complications may need more frequent ultrasounds. ...Read more

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Why is it necessary to get so many ultrasounds in pregnancy/

Why is it necessary to get so many ultrasounds in pregnancy/

It isn't: In an uncomplicated pregnancy, repeated ultrasounds aren't necessary. A 1st trimester sonogram is best for confirming the due date and number of fetuses while fetal anatomy is best assessed in the mid to late 2nd trimester. Additional sonograms may be recommended if complications such as hypertension, diabetes, or pre-eclampsia arise, but for the uncomplicated, low risk patient, 2 should suffice. ...Read more

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Ultrasounds in the first 4 to 6 weeks of pregnancy can only have a error of 3 to 5 days?

Ultrasounds in the first 4 to 6 weeks of pregnancy can only have a error of 3 to 5 days?

very accurate: If done properly the first trimester ultrasound measuring the actual embryo length is the most accurate dating method. ...Read more

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Could someone please tell me how many ultrasounds are needed in a pregnancy? In which weeks these should be done? Thank u so much.

Could someone please tell me how many ultrasounds are needed in a pregnancy? In which weeks these should be done? Thank u so much.

A reasonable: Approach is an ultrasound around 20 weeks to look for any fetal or maternal problems and to estimate the date of delivery. This is often the only ultrasound an otherwise healthy expecting mother will have. ...Read more

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Are 3D ultrasounds during pregnancy safe?

Are 3D ultrasounds during pregnancy safe?

Debated but gnrly ya: The question of whether or not ultrasound (US) can physically heat the tissue (because of multiple internal reflections & the focusing of the US beam) is a topic that is debated among scientists, but generally speaking, though, US is considered safe by the FDA / medical community. The max power in the systems is regulated by the FDA, & no proven harm has been demonstrated as yet. Need more studies ...Read more

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What's the difference between cyst and pregnancy ultrasounds?

What's the difference between cyst and pregnancy ultrasounds?

same ultrasound: Same ultrasound just what it is looking for and what is found is different. ...Read more

Dr. Andrew Seibert
4 Doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more