Transvaginal Pregnancy Ultrasound

This is an ultrasound of a pregnancy done with a slim probe placed in the vagina rather than on the belly. Putting the probe closer to the uterus gives a much sharper picture, which matters most in early pregnancy and when the cervix needs to be measured. It is a separate code from the through-the-abdomen scan, and the two are sometimes done in one visit.

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What it is

Ultrasound images are built from sound echoes, and sound loses detail with every centimeter of tissue it crosses. A transvaginal scan shortens that distance: a narrow probe, covered and lubricated, is placed a few inches into the vagina, so only the vaginal wall separates it from the uterus and ovaries. The result is a far more detailed view than a probe on the abdomen can produce, particularly in the first weeks of pregnancy when the embryo is only millimeters across. This code is the transvaginal study of a pregnant uterus specifically, as opposed to the same approach used outside pregnancy.

Why it is done

  • To confirm that a pregnancy is inside the uterus and to look for a heartbeat, early on, when an abdominal scan may show too little to be sure
  • To work out the age of a very early pregnancy from measurements that are only reliable at close range
  • To measure the length of the cervix, which is done by this route because the cervix is hard to see well through the abdomen
  • To look at the position of the placenta in relation to the cervical opening
  • To investigate bleeding or pain in early pregnancy

What to expect

Unlike the abdominal scan, this one is usually done with the bladder empty, so patients are often asked to urinate first. The patient lies back with knees bent and feet supported, and the sonographer inserts the probe, which is roughly the width of a tampon applicator, and angles it to sweep through the uterus. Pressure and a sense of fullness are common; sharp pain is not expected and is worth saying out loud. The scan usually takes fifteen to thirty minutes. Images are reviewed by a physician afterward, and the sonographer may not be permitted to give findings during the scan.

Questions worth asking

  • Is an abdominal ultrasound planned in the same visit? Both can be billed, and it helps to know before rather than after.
  • Does my plan's maternity benefit cover a set number of ultrasounds, and does this one count against that number?
  • If my obstetric care is billed as a single global package, is this scan inside that package or outside it?
  • Is the scan being performed in a hospital-based clinic? The same study in an office often carries no facility fee.

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