Testing 1-2-3 | Fit Pregnancy

Testing 1-2-3

The prenatal tests you may receive and what they mean

Test
Chorionic villus sampling

Who needs it, when is it performed?
Women with a history of birth defects or who will be over 35 at term; at 10–12 weeks.

What's Involved?
A needle is inserted through the abdomen and uterus (or a catheter is inserted through the vagina and cervix) to sample the outer fetal
membrane
.

What does it reveal?
Chromosomal or genetic birth defects such as Down syndrome or spina bifida. Accuracy rate is about 98%

Potential harm to fetus?
Slightly increased risk of miscarriage (1 in 100–200) and damage to fetus.

What's next? Follow-up:
Depends on findings; genetic counseling may be advised if an abnormality is found.

Test
Blood sugar

Who needs it, when is it performed?
Most women; at 24–28 weeks or when glucose is found in the urine.

What's Involved?
A blood sample is drawn after the mother drinks a sugary mixture.

What does it reveal?
Glucose level in the blood may indicate gestational diabetes.

Potential harm to fetus?
None.

What's next? Follow-up:
A change in diet and/or insulin treatment may be prescribed.

Test
Group B Strep

Who needs it, when is it performed?
All women; at 35–37 weeks.

What's Involved?
Vagina and perineum are swabbed and sample is examined.

What does it reveal?
Presence of potentially deadly bacteria that can be passed to baby at birth.

Potential harm to fetus?
None.

What's next? Follow-up:
Antibiotics are given during labor if bacteria are found.

 

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