Obstetric ultrasound dating accuracy

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Being highly safe for patients and clinicians, obstetric ultrasound has proven a fundamental ingredient of prenatal care for applications ranging from accurate dating of a pregnancy to detecting pregnancy complication factors and fetal abnormalities. Benefiting from being highly portable and economical, it has become one of the most commonly performed imaging modalities in clinical practice, providing real-time data acquisition and visualization. Although ultrasound imaging is widely used, it remains one of the most complex and time consuming examinations, associated with high variability and low quality of monochrome images. The accuracy of fetal abnormality diagnosis is highly dependent on physiological factors, quality of the machine, and the experience and cognitive ability of diagnosticians.
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What to Look for in Your Baby Boy Ultrasound

A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures.
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Ultrasound Images of Your Growing Baby Boy

Objective: To compare last menstrual period and ultrasonography in predicting delivery date. Methods: We used ultrasound to scan 17, nonselected singleton pregnancies at completed weeks. The last menstrual period LMP was considered certain in 13, and uncertain in cases. The duration of pregnancy from the scan to the day of spontaneous delivery was predicted by crown-rump length, biparietal diameter BPD , and femur length FL using linear regression models, and the results were compared with estimates based on LMP. Results: At all gestational ages, ultrasound was superior to certain LMP in predicting the day of delivery by at least 1.
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Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn't match the due date that is estimated by ultrasound also known as a sonogram. During an ultrasound, a technician spreads a warm gel over the lower part of the abdomen, and then presses a tool called a transducer against the belly to examine the fetus using sound waves.
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