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Doctor insights on: Do Pregnancy Dating Scans Provide Accurate Results

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Do pregnancy dating scans provide accurate results?

Do pregnancy dating scans provide accurate results?

Yes: Early or 1st trimester ultrasound is generally an accurate way to date pregnancy. However, the further along the pregnancy is, the less accurate the dates. ...Read more

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Dr. Warren Foster
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


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Are abdominal ultrasounds just as accurate at dating pregnancies at 8 weeks as transvaginal?

Are abdominal ultrasounds just as accurate at dating pregnancies at 8 weeks as transvaginal?

Transvag better: Generally, transvag more accurate as you can get better views (usually). But if thin patient, experienced operator of the ultrasound and good views it can be very accurate. Best of luck. Dr R ...Read more

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U/s:single intrauterine gestation sac & fetal pole crown2rump 0.53cm 6w3d + or - a wk no yolk sac/ hb. Nxt u/s i'll be 11wk.Should i worry?Dating off?

U/s:single intrauterine gestation sac & fetal pole crown2rump 0.53cm 6w3d + or - a wk no yolk sac/ hb. Nxt u/s i'll be 11wk.Should i worry?Dating off?

A little concerning: More information needed but if a fetal pole is present and can be measured, then a fetal heart beat should seen. If there is just a gestational sac with no fetal pole, then the size of the gestational sac matters. A gestational sac that measures 18mm should have fetus with a heartbeat and if not, then a miscarriage is most probable. Good luck. ...Read more

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Do you really need to know your LMP or is a dating scan an accurate enough way to see how far gone you are in pregnancy?

Do you really need to know your LMP or is a dating scan an accurate enough way to see how far gone you are in pregnancy?

US is enough: An early dating scan in the first trimester of pregnancy is quite accurate for determining how far along someone is in her pregnancy. It is especially useful for those who are uncertain of their lmp or who have irregular cycles. While not exact, the dating scan is usually accurate within a few days of the actual gestational age. ...Read more

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How accurate is a dating scan performed at 13 weeks pregnancy?

How accurate is a dating scan performed at 13 weeks pregnancy?

Should be ok: Dating ultrasound scans have good accuracy at 8-11 weeks, so one done at 13 weeks should still be reliable. Dates by ultrasound are always estimates. ...Read more

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Is a pregnancy scan accurate on weeks that you are not?

Is a pregnancy scan accurate on weeks that you are not?

LMP dating vs US: Both methods have some error. Us dating is most accurate between 8 and 13 weeks using the crown rump length of the fetus. If us and lmp dating are different by more than 2 weeks, the accuracy of lmp dating should be questioned. Making sure interval growth is appropriate at your doctor checkups and the fetal anatomy ultrasound is complete is what you want to see. ...Read more

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How accurate are ultrasound scans in pregnancy?

How accurate are ultrasound scans in pregnancy?

Depends: The precision of an ultrasound depends somewhat on the equipment, the technician, the interpreter & the reason for study. If the scan is done to verify the placental location, fetal position & head size(to verify dates), simple equipment works ok. Specific things about baby like heart anatomy, facial features and the like, require a skilled technician using special equipment & interpretation. ...Read more

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