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Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an estimated gestational age.
However, variations in each woman’s cycle and each pregnancy may hinder the accuracy of the gestational age calculation.
Ultrasounds are diagnostic procedures that detect or aid in the detection of abnormalities and conditions related to pregnancy.
Ultrasounds are usually combined with other tests, such as triple tests, amniocentesis, or chorionic villus sampling, to validate a diagnosis.
It is recommended that ultrasound only be used if medically indicated. The heartbeat may not be detected for reasons that include: tipped uterus, larger abdomen, or inaccurate dating with last menstrual period.
Heartbeats are best detected with transvaginal ultrasounds early in pregnancy.
An ultrasound exam may be performed throughout pregnancy for the following medically-necessary reasons: First Trimester: The ultrasound is a noninvasive procedure which, when used properly, has not demonstrated fetal harm.
The long-term effects of repeated ultrasound exposures on the fetus are not fully known.
There is not a recommended number of ultrasounds that should be performed during routine prenatal care.
Because ultrasound should only be used when medically indicated, many healthy pregnancies will not require an ultrasound.
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