If you have Rh negative blood - an inherited trait that refers to a specific protein found on the surface of red blood cells - you might need a blood test to check for Rh antibodies. Blood tests might be offered between week 24 to 28 of pregnancy to check your blood count and iron levels and screen for diabetes that can develop during pregnancy (gestational diabetes). Fetal ultrasound also might give you an opportunity to find out the baby's sex. A detailed ultrasound can help your health care provider evaluate fetal anatomy. Fetal ultrasound is an imaging technique that uses high-frequency sound waves to produce images of a baby in the uterus. During amniocentesis, a sample of the fluid that surrounds and protects a baby during pregnancy is removed from the uterus for testing. If your results are concerning, your doctor will recommend a diagnostic test, typically an amniocentesis. Blood tests might be offered to screen for genetic or chromosomal conditions, such as spina bifida or Down syndrome. You'll likely notice flutters for the first time around 18 to 20 weeks of pregnancy.ĭuring the second trimester, you might be offered various prenatal screenings or tests: Keep in mind that mothers notice these movements at different times, and movement at this time in pregnancy is typically unpredictable. Tell your health care provider when you begin noticing flutters or kicks. The Doppler instrument detects motion and conveys it as sound. At second trimester visits, you might hear your baby's heartbeat using a Doppler instrument. After 20 weeks of pregnancy, this measurement in centimeters often matches the number of weeks you've been pregnant, plus or minus 2 centimeters. By measuring the distance from the pubic bone to the top of your uterus (fundal height), your health care provider can gauge your baby's growth. Then it's time for your baby to take center stage. Your health care provider will check your blood pressure and weight at every visit.
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