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The quad screening is a blood test that may be done at 15 to 22 weeks of pregnancy. It's used to look for possible problems with your baby. The quad screening measures the amounts of four things in a pregnant woman's blood. They are:
This test can't show for sure that your baby has a birth defect. You would need a diagnostic test called amniocentesis to find out for sure if there is a problem.
The quad screening is done to find out the chance that your baby has certain birth defects, such as Down syndrome, Trisomy 18, spina bifida, or anencephaly.
A health professional uses a needle to take a blood sample, usually from the arm.
If you have a positive test result for Down syndrome or Trisomy 18, your doctor may give you the option to have an amniocentesis to find out for sure if there is a problem. But it's your choice whether to have another test. If you have a negative result, amniocentesis is not indicated. A positive result for spina bifida is following up by a detailed anatomy ultrasound.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. Ask your doctor when you can expect to have your test results.
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Adaptation Date: 2/28/2022
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services
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