Doctor insights on:
What Is More Accurate Lmp Or Measurements
It depends: In 1st trimester the measurements are very reliable. At the anatomy screen/survey (usually 18 - 22 weeks) the dating can be off by a couple of weeks. Standard measurements include two head measurements (the most accurate) and measurements of the abdomen circumference and the femur (thigh bone). Dating in the 3rd trimester becomes less accurate. ...Read more
Pretty good: The dating is accurate to about a week as long as the sonographer can see the baby early on. The due date though is really variable. ...Read more
Is a gestational age reading accurate on a 10 week ultrasound? And what exactly are they measuring?
Not always true : Early in fetal life all babies grow at the same rate. The longer into the pregnancy the more each baby grows slightly differently. Therefore, early in pregnnacy we can measure the size of a baby and very accurately predict the due date. Later on though, the sonographic measurements less accurately predict the due date. ...Read moreSee 4 more doctor answers
If LMP and 12 week ultrasound correlate, would the u/s be considered more accurate since the LMP is known? Or is there still 1 week margin of error?
Is an abdominal us at 11wks accurate for dating a pregnancy? What is the range of accuracy? Possible to be 4 weeks off? Ex measure 11wks but be 15wks?
No should not be: An 11 week us should be accurate within 1 week either way a the most and usually more accurate than that. ...Read more
Which gestational age is more accurate, LMP based or ultrasound one? By LMP i am 27weeks and 4 days.ultrasound says 28 weeks
Ultrasound dating: First trimester ultrasound is accurate within 5-7 days. 2nd trimester ultrasound has accuracy of +/_ 2 weeks. Lmp dating also assumes a 28 day cycle. There is no test that can date conception more accurately than a 1 week window. Due date is based on lmp unless us off by more than 1 week 1st trimester or 2 weeks in 2nd. ...Read moreSee 1 more doctor answer
Best on earlier u/s: Ultrasounds use composite data obtained during the exam to determine an EDD (estimated date of delivery). This date will also have a +/- number of days giving an accuracy range. First trimester ultrasounds are accurate to within about a week, second trimesters estimates are accurate within about 2 weeks, and third trimester scans about 3 weeks. ...Read more
Both is best: The most accurate dating is where the 1st trimester ultrasound is within a week of the lmp dating; that confirms the lmp dating. If the 9 week ultrasound gives dates greater than 1 week from what's predicted by the lmp then the lmp is not accurate and the ultrasound dating should be used. ...Read more
Which test is more accurate in measuring proximal abdominal aorta size in men: ultrasound or mri/mra? Is ap more accurate than tranverse measurement?
Ultrasound: Is the preferred method for screening for abdominal aortic aneurysm as it is less expensive and involves no ionizing radiation. If aortic enlargement is seen, cta is usually chosen to determine most accurately degree of aortic enlargement, extent of aneurysm, and involvement of aortic branches. ...Read more
What changes a due date? And why is the first trimester ultrasound more accurate than the second trimester ultrasound?
Ultrasound dating.: First trimester ultrasound is by far the most accurate in determining the precise due date (+/- 3-7 days, depending on exactly when it is performed). Second trimester sonograms are less accurate but still helpful in pegging down the due date within +/-7-12 days. Third trimester scans are not very accurate in dating the pregnancy, as growth varies (+/- 14-21 days). Menstrual dating is not very good. ...Read more
Embryo transfer: Embryo transfer would be the ultimate gold standard for gestation age.The number of days since conception of the transferred embryo (3-5 days) would be known so the precise time of conception would be available so the estimated due date could be more precisely estimated. ...Read more
Pregnant?: I assume you are pregnant. Early transvaginal ultrasound is very accurate and giving a proper gestational age for you pregnancy. From that age a due date is given and an "lmp" date is given even though you may not have actually had a menstrual cycle at that time. ...Read moreSee 1 more doctor answer
Usually close. : Studies have shown that up to 20 wks gestation, ultrasound can vary by as much as 1.2 wks. Others have shown a 2 wk variaton between 18 to 28 wks, and 3 wk variation at greater than 28 wks. In a normal developing fetus, variations are usually secondary to the experience and expertise of the technologist, position of the fetus, and the accuracy of the measurements. ...Read more
Is MRI more accurate than ultrasound test in measuring size of proximal abdominal aorta?If yes or no, why?
What is more accurate in dating conception, going 14 days after the last period, or the ultrasound crown rump?
CRL!!!: Due to biological variability in ovulation and implantation/fertilization timing, the use of crl by first trimester ultrasound is more accurate than use of last known menstrual period as dating criterion. In fact, studies have proven that even with certain menstrual dates, the sonographically-determined due date before 20-24 weeks is more accurate for clinical purposes (see jason gardosi's papers). ...Read more
Depends: both types of pelvic ultrasound approaches are useful and which is better depends on what part of the pelvis is to be examined and often the body size and shape of the patient. Many clinics do both if they are indicated based on the clinical question requested by the ordering doctor. ...Read moreSee 1 more doctor answer
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