Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Health & Pregnancy

Font Size

Blood Tests

WebMD Medical Reference
Reviewed by Nivin Todd, MD

Who Gets the Test?

All women get some blood tests when they're pregnant. Blood tests check on your health and help rule out problems.

What the Test Does

When you first get pregnant, your doctor will take a blood sample. The lab will check for problems that could affect your baby. They include rubella, cystic fibrosis, sickle cell anemia, hepatitis B, many sexually transmitted diseases, and others.

Your doctor will also use the sample to check your blood type, Rh factor, glucose, cell counts, and hemoglobin, the protein that carries oxygen throughout your body.

Later on, you will get your blood tested again. These tests can check for diabetes, infections, and gauge your baby's risk of birth defects.

How the Test Is Done

Blood tests are safe for you and your baby. A technician will draw a small amount of blood from your arm.

What to Know About Test Results

If any of your test results are abnormal, your doctor will probably suggest follow-up tests. If there is a problem, treatment or extra monitoring will help keep you and your baby healthy.

How Often the Test Is Done During Your Pregnancy

You'll get a blood test on your first prenatal visit. In your second trimester, you will get a blood test to check for diabetes and recheck your hemoglobin. If you are Rh negative, your antibodies will be rechecked. You may get other blood tests, depending on your preferences and health.

Other Names for This Test

Rh factor, First Trimester Screening, Triple Screen Test, Quad Screen, STD Tests, Prenatal labs

Tests Similar to This One

Urine test

Reviewed on June 12, 2014

Pregnancy Week-By-Week Newsletter

Delivered right to your inbox, get pictures and facts on
what to expect each week of your pregnancy.

Today on WebMD

hand circling date on calendar
Track your most fertile days.
woman looking at ultrasound
Week-by-week pregnancy guide.
Pretty pregnant woman timing contaction pains
The signs to watch out for.
pregnant woman in hospital
Are there ways to do it naturally?
slideshow fetal development
pregnancy first trimester warning signs
What Causes Bipolar
Woman trying on dress in store
pregnant woman
Close up on eyes of baby breastfeeding
healthtool pregnancy calendar
eddleman prepare your body pregnancy