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Dating is more accurate when done earlier in the pregnancy; if a later scan gives a different estimate of gestational age, the estimated age is not normally changed but rather it is assumed the fetus is not growing at the expected rate.
Not useful for dating, the abdominal circumference of the fetus may also be measured.
This gives an estimate of the weight and size of the fetus and is important when doing serial ultrasounds to monitor fetal growth.
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The most accurate measurement for dating is the crown-rump length of the fetus, which can be done between 7 and 13 weeks of gestation.
After 13 weeks of gestation, the fetal age may be estimated using the biparietal diameter (the transverse diameter of the head, across the two parietal bones), the head circumference, the length of the femur, the crown-heel length (head to heel), and other fetal parameters.
There is no difference, however, in perinatal death or poor outcomes for babies.
In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.
One variant, transvaginal sonography, is done with a probe placed in the woman's vagina.