Doctor insights on:
How Accurate Are Pregnancy Scans
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 moreSee 1 more doctor answer
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
The most accurate: The earlier you get your first ultrasound, the more accurate is the estimate of your due date and the age of the pregnancy. During the first trimester, the dates are within about a week of the actual conception date. Later in the second trimester, you can be at least 2 weeks off. If you were to present for your first sono in the third trimester there can be 3 or more weeks of uncertainty of dates. ...Read more
Depends: Home pregnancy tests measure the amount of beta human Chorionic Gonadotropin hormone in urine. It takes about 1 week after conception for beta HCG to become detectable in the blood and 2 weeks for it to become detectable in urine. If it has not been 2 weeks since your missed period, your home pregnancy test may be falsely negative. ...Read moreSee 1 more doctor answer
Accurate: Urine pregnancy tests bought from a drugstore in the U.S. Are quite accurate. They give a reliable result, if done correctly, about a week after missing a period (or 3 weeks after sex). If a woman wants to be extra certain, she can buy 2 different brands of tests and see if they give the same result. ...Read more
Variable accurancy: The accuracy of MRI depends a great deal on the person who is being scanned being able to hold still during the scan. Motion artifact is the most common artifact that decreases the accuracy of an MRI. The overall accuracy also depends on if the right type of MRI is ordered and if contrast is used where needed. ...Read moreSee 1 more doctor answer
Utility of the EEG: An EEG measures the brain waves. If one is obtained during a seizure, they are diagnostic for seizure. This is much better than seeing a seizure with our eyes. The EEG is also helpful for monitoring brain activity during sleep and alertness, coma and confusion. ...Read moreSee 1 more doctor answer
Being Pregnant: Yes. The early ones are thought to be more accurate than later in pregnancy. You can verify dating with a conception calculator. Remember all the tools you need to learn or monitor you pregnancy are available online. Here is where I recommend you start: http://www.babymed.com/conception-calculator ...Read more
3 weeks after sex: A urine pregnancy test done correctly gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test. If a woman has her normal regular period, then she is not pregnant, and a test is not needed. ...Read more
It varies: Ovulation prediction kits are one predictor of ovulation. Others are menstrual cycle length, pain at ovulation, vaginal and cervical fluids. Ultrasound is a great way of detecting ovulation. If everything looks good, ovulation has probably occurred, but the only real test is whether you get pregnant. ...Read moreSee 1 more doctor answer
Very accurate: Ultrasounds tend to get more inaccurate as your pregnancy progresses. First trimester ultrasounds are more accurate than second trimester ultrasounds, which are in turn more accurate than third trimester ultrasounds. First trimester ultrasounds can reliably predict gestational age within 5-7 days. ...Read moreSee 1 more doctor answer
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