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After you've found out you're pregnant, a blood sample is taken during your prenatal visit to the doctor. More blood will likely be drawn during later prenatal checkups for other reasons.
Blood tests are routine for all pregnant women.
Be prepared for a small needle stick, usually in the arm. The blood is then sent to a laboratory and analyzed.
Results from the tests are usually available within a few days. Performed properly, blood tests are nearly 100 percent accurate. They are interpreted in various ways, depending on what analyses have been performed on the blood, and what information your practitioner needs to know. The results are not usually called to the patient unless there is something that either needs treatment or further testing.
Typically, you have the following tests performed.
CBC - checks for anemia which has been associated with mental delay and platelets which are important for blood clotting
Blood type - ABO and Rh status - either + or -
Antibody screen - to ensure no irregular antibodies in your blood that may harm the developing fetus
Pap smear - screens for cervical cancer
Gonorrhea and Chlamydia cultures - are recommended by the CDC on everyone regardless of age, relationship status, or symptoms because infants delivering in the presence of these bacteria can lead to blindness and other more serious infections - pneumonia, etc.
Immune status to HIV, Syphilis, Hepatitis B, and Rubella - infections that can create problems during pregnancy as well as infections in your newborn baby