This test is most often done between the 15th and 22nd weeks of the pregnancy. It is most accurate between the 16th and 18th weeks. A blood sample is taken and sent to the lab for testing.
The test measures levels of 4 pregnancy hormones:
If the test does not measure levels of inhibin A, it is called the triple screen test.
The test is done to find out if your baby might be at risk for certain birth defects, such as Down syndrome and birth defects of the spinal column and brain (called neural tube defects). This test is a screening test, so it does not diagnose problems.
Certain women are at greater risk for having a baby with these defects, including:
Normal levels of AFP, hCG, uE3, and inhibin A.
To interpret test results use the reference range in the laboratory report.
None
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