Expected Schedule for Prenatal Testing
The following is a list of “all” our prenatal testing in chronological order of weeks of gestation.
The tests in BOLD lettering are ordered for all prenatal patients. The other tests are optional based on your providers orders or your choice.
These are drawn on your first visit with us. They include: Blood type, RH factor, antibody screen, blood count, rubella antibody, syphilis, hepatitis B antigen, HIV & urine culture.
Urine samples will be done at “each visit” to measure glucose and protein. There are routinely urine cups in each bathroom with paper bags to collect your sample if you need to void prior to being called back for your visit.
First Trimester Ultrasound
This is ordered by the physician after your first visit to confirm your due date and your baby’s well being. It is done between 6-12 weeks gestation, ideally before your OB teaching visit with the Nurse Practitioner.
Chorionic Villi Sampling (CVS)- An optional genetic "diagnostic" test that samples from the chorionic villi of the placenta. Results from this test will provide you with a chromosomal analysis for your baby.
Sequential screen is an optional genetic "screening" test that includes a counseling session with a genetic counselor, an ultrasound to check the nuchal thickness on the baby and two sequential blood tests. One blood test is done with the ultrasound and the other a few weeks later. This test will give you an idea if your baby is at increased risk for Down syndrome, trisomy 18 and neural tube defects. It is approximately 95 percent predictive.
Quad screen is a “screening” genetic test. It will tell you if your baby is at increased risk for Down syndrome, trisomy 18 or neural tube defects. It is a one-time blood test that is done sometime during this time of your pregnancy. It is about 85 percent predictive.
Amniocentesis is an optional “diagnostic” genetic test that will tell you the chromosomal analysis and neural tube information on your baby. It is done by sampling the amniotic fluid around your baby.
Survey ultrasound is done around this time of your pregnancy for a “head to toe” look at your baby and the placenta. All the organs and limbs of the baby will be assessed to ensure your child is growing normally.
Glucose test and blood count will be rechecked at this time. The glucose test takes one hour. You eat normally the day of the test. When you arrive for your visit, you will be given a glucose “cocktail” to drink. Once you have finished the drink, you may not eat, chew gum or drink anything for one hour. You will then get a “timed” blood test. We advise you have a visit between the start and finish of this test for the best time management.
28- 32 weeks
If you have an RH negative blood type, you will receive a shot of Rhogam. Ideally, we do this at the time of a prenatal visit.
Group B strep is checked at this time by a quick swab to the outside of the vagina and anal fold. Group B strep can be normal flora for us. Some babies when exposed to this bacteria in the birth canal can become very sick. To prevent this problem, all moms that carry group B strep will be given IV antibiotics during their labor.
Most providers will do a vaginal exam with your visits after this time to check for cervical changes and position of the baby. If we are uncertain that your baby is head down, an ultrasound will be ordered to verify fetal position.