Blood tests are routine for all pregnant women. The tests determine your blood type (A, B, AB, or O) and Rh factor (negative or positive). In addition, your blood will be tested for anemia (a test that will probably be repeated later in your pregnancy), for infections such as hepatitis B and syphilis, and for infection with and antibodies to German measles (rubella). You may be offered additional tests for HIV and toxoplasmosis.
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.
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