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The Triple Screening Test is done in the second trimester. Doctors use this test to check the risks of various chromosomal abnormalities. But, mainly this test helps in detecting neural tube defects; these defects are the birth defects of the spine, brain, and spinal cord. This Prenatal DNA Testing is typically a blood test in which 3 substances are measured in the blood such as alpha-fetoprotein, human chorionic gonadotropin, and estriol........Read more !