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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 best way to check on your pregnancy is to have an ultrasound scan. By 6.5 weeks, your HCG levels should be at least 2,000 mIU/ml â and probably higher. Thatâs when you can see, and hear, a fetal heartbeat in the scanning room. Reading too much into HCG scores is a slippery slope.