do an initial check if you missed the earlier viability ultrasound This ultrasound checks for overall fetal development and is sometimes called the “anatomy scan.”But aside from the two standard ultrasounds, your doctor may schedule additional screenings to: Because it’s based on non-ionizing radiation as opposed to the ionizing sort found in X-rays, you and baby won’t be exposed to the same dangers as you might with an X-ray.A 16-week ultrasound isn’t standard — but don’t let it worry you! Look at it as an opportunity to get more glimpses of baby.Your first ultrasound will usually occur between 8 and 14 weeks to listen for a heartbeat to confirm that you’re pregnant and to estimate a due date.Then the next ultrasound is typically between 18 and 20 weeks. Waves in the megahertz range have enough energy to heat up tissues slightly, and possibly produce tiny bubbles inside the body.In the hands of a trained medical professional, 3D ultrasounds are generally safe.
address any complications you may be having, such as bleedingThere’s nothing you need to do to prepare for the 16-week ultrasound.This transabdominal scan relies on a transducer that moves over your abdomen to display 2D images of your developing baby. look for fetal conditions such as heart abnormalities, Down syndrome, or spina bifida check for multiples if they suspect you might be carrying twins, triplets, or more
So, if you’re 27 weeks along, it’s assumed that you would have a 27-centimeter fundal height measurement.However, there’s a margin of error in the measuring. This confirms that your baby is growing properly.Usually, by the time you’re in your 24th week, your fundal height is the same number as your gestational week in your pregnancy. So, don’t be surprised if your sonographer gently pokes your abdomen to encourage your baby to move if they’re not especially active during the appointment.At 16 weeks, your baby is usually between 4 and 5 inches long and weighs around 5 ounces.During your 16-week appointment, your physician may measure your fundal height, though this is typically done starting at 20 weeks.This noninvasive measurement checks the distance in centimeters from the top of your baby bump to the top of your pubic bone. During the procedure, your doctor or ultrasound technician — known as a sonographer — will:This is all to ensure that everything is developing on track.Depending on baby’s position, you might also be asked to move or turn so the technician can get a better look at different angles.They’ll also check for fetal movement.
So, physicians prefer to rely on noninvasive measures — like ultrasound — for initial screening. Or they could recommend further noninvasive prenatal testing.While amniocentesis and CVS are incredibly effective at confirming developmental abnormalities, they also carry tiny risks that can cause complications in the pregnancy such as miscarriage. They do this by checking movement and measurements, as we mentioned.While the 16-week appointment is noninvasive, your physician may also recommend that blood to be drawn to run a triple or quadruple screen for potential abnormalities like neural tube problems, Down syndrome, or additional chromosomal issues that can be screened by checking your blood.This screening usually takes place between the 15th and 20th week, but screens conducted between 16 and 18 weeks are said to be the most accurate.If those blood tests come back with results that indicate there may be an issue, your OB may then discuss more invasive diagnostic tests such as amniocentesis or chorionic villus sampling (CVS). It’s normal.What else the doctor may want to check forThe 16-week ultrasound, if you have one, is also a critical period where your doctor will want to check for any potential developmental abnormalities. If you had an ultrasound early in your pregnancy to estimate your due date, it will be more accurate.But all this to say: Don’t panic if baby is measuring a week or so off in either direction.
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