Decrease (-) Restore Default Increase (+)
Print    Email
Bookmark and Share

Health Information

Health Information

Health Information

Health Information - Special Health Issues

Search Health Information    Third-Trimester Exams and Tests

Third-Trimester Exams and Tests

Topic Overview

Routine exams and tests

At each prenatal visit, you can expect to be weighed and have your urine and blood pressure checked. Your health professional will monitor your fetus's growth and position by measuring the size of your uterus (fundal height) and feeling (palpating) your abdomen.

If your fetus is not in the head-down (vertex) position after 36 weeks (as confirmed by fetal ultrasound), your health professional may try to turn it gently from the outside (version). Version carries some risks, and not all health professionals are skilled in this technique. For more information, see the topic Breech Position and Breech Birth.

Late in your pregnancy, your health professional:

  • Is likely to check you for group B streptococcus, which can cause severe newborn illness, disability, or death. This is done by rubbing the vaginal and rectal areas with a cotton swab. If you test positive for group B strep (or if for some reason you are not tested), you will be treated with antibiotics during labor.
  • Will check to see how far the baby's head has dropped into your pelvis. Close to delivery, you may be checked to see whether your cervix has begun to stretch and open (cervical effacement and dilatation).
  • May check you for hepatitis B . If you test positive for hepatitis B infection, your baby will receive the hepatitis vaccine and hepatitis B immunoglobulin (HBIG) within 12 hours of birth.

Additional testing

Later in pregnancy, your health professional may recommend an amniocentesis if:

  • You are going to deliver prematurely. An amniocentesis is commonly used to see whether the fetus's lungs are developed enough for delivery.
  • There is a concern about infection in the amniotic fluid .

Related Information

Credits

By Healthwise Staff
Primary Medical Reviewer Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer Kirtly Jones, MD - Obstetrics and Gynecology
Last Revised July 23, 2012

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

© 1995-2013 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

© 2014 St. Mary's Health System   |  3700 Washington Avenue  |  Evansville, IN 47750  |  (812) 485-4000