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1 Blood test. 2  This blood test measures the levels of pregnancy-associated plasma protein-A (PAPP-A) and the pregnancy hormone known as human chorionic gonadotropin (HCG). 3  Abnormal levels of PAPP-A and HCG may indicate a problem with the baby.f your screening test results are positive or worrisome, or you're at high risk of having a baby with Down syndrome, you might consider more testing to confirm the diagnosis. Your health care provider can help you weigh the pros and cons of these tests.
The Pap smear is currently the best test available for the prevention of most cases of cervical cancer. All women between the ages of 18 and 70 should have a Pap smear every two years.Women should start having Pap smears between 18 and 20 years of age or one to two years after becoming sexually active.It is important to know that no screening test is 100 per cent accurate.omen should start having Pap smears between 18 and 20 years of age or one to two years after becoming sexually active. It is important to know that no screening test is 100 per cent accurate.