Pregnancy: 7 Common Third Trimester Tests

  • Medical Author:
    Melissa Conrad Stöppler, MD

    Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

  • Medical Editor: Steven Doerr, MD
    Steven Doerr, MD

    Steven Doerr, MD

    Steven Doerr, MD, is a U.S. board-certified Emergency Medicine Physician. Dr. Doerr received his undergraduate degree in Spanish from the University of Colorado at Boulder. He graduated with his Medical Degree from the University Of Colorado Health Sciences Center in Denver, Colorado in 1998 and completed his residency training in Emergency Medicine from Denver Health Medical Center in Denver, Colorado in 2002, where he also served as Chief Resident.

View Stages of Pregnancy Slideshow Pictures

Quick GuideFetal Development Pictures Slideshow: Month by Month

Fetal Development Pictures Slideshow: Month by Month


Although amniocentesis (removal of a sample of amniotic fluid with a long, thin needle) is most often done during the second trimester, there are certain conditions that may warrant an amniocentesis later in pregnancy. These conditions include a suspicion of chorioamnionitis or a risk of premature delivery, since amniocentesis fluid can be used to estimate maturity of the fetal lungs.

Ultrasound examinations

Ultrasound examinations may be performed in the third trimester if needed to help evaluate fetal growth and look for problems with the placenta.

Medically reviewed by Steven Nelson, MD; Board Certified Obstetrics and Gynecology

Protect Your Baby from Group B Strep!

Medically Reviewed by a Doctor on 4/14/2015

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  • Common Third Trimester Tests - Experience

    Please describe your experience with tests you had during your third trimester of your pregnancy.

  • Common Third Trimester Tests - Group B Strep

    If your group B strep test was positive during your pregnancy, how was it treated during labor and delivery?


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