Banner image

Toxoplasma blood test

Toxoplasma serology; Toxoplasma antibody titer

Find

Learn More

Definition

The toxoplasma blood test looks for antibodies in the blood to a parasite called Toxoplasma gondii.

How the Test is Performed

How the Test will Feel

When the needle is inserted to draw blood, some people may feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

How to Prepare for the Test

There is no special preparation for the test.

Normal Results

Normal results mean you have likely never had a toxoplasma infection.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test result.

Risks

Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)

What Abnormal Results Mean

Abnormal results mean that you have probably been infected with the parasite. Two types of antibodies are measured, IgM and IgG:

  • If level of IgM antibodies is raised, you likely became infected in the recent past.
  • If level of IgG antibodies is raised, you became infected sometime in the past.

Why the Test is Performed

The test is done when the health care provider suspects that you have toxoplasmosis. The infection is a danger to a developing baby if a pregnant woman gets infected. It is also dangerous in people with HIV/AIDS.

In pregnant women, the test is done to:

  • Check if a woman has a current infection or had an infection in the past.
  • Check if the baby has the infection.

The presence of antibodies before pregnancy probably protects a developing baby against toxoplasmosis at birth. But antibodies that develop during pregnancy may mean the mother and baby are infected. This infection during pregnancy increases the risk for miscarriage or birth defects.

This test may also be done if you have:

  • An unexplained lymph node swelling
  • An unexplained rise in the blood white cell (lymphocyte) count
  • HIV and have symptoms of a toxoplasmosis of the brain (including headache, seizures, weakness, and speech or vision problems)
  • Inflammation of the back part of the eye (chorioretinitis)

Review Date: 9/27/2017
Reviewed By: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

ADAM QualityA.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is an independent audit to verify that A.D.A.M. follows rigorous standards of quality and accountability. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial policy, editorial process and privacy policy. A.D.A.M. is also a founding member of Hi-Ethics and subscribes to the principles of the Health on the Net Foundation (www.hon.ch).

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 9-1-1 for all medical emergencies. Links to other sites are provided for information only—they do not constitute endorsements of those other sites. © 1997-2010 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.