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Torch Screen

Definition

The TORCH screen is a blood test that checks for several different infections in a newborn. TORCH stands for toxoplasmosis, rubella, cytomegalovirus, herpes simplex, and HIV.

Sometimes the test is spelled TORCHS, where the extra "S" stands for syphilis.

How the test is performed

The health care provider will clean a small area (usually the finger) and stick it with a sharp needle or cutting instrument called a lancet. The blood may be collected in a small glass tube, on a slide, onto a test strip, or into a small container. If there is any bleeding, cotton or a bandage may be applied to the puncture site.

How to prepare for the test

For specific information regarding how you can prepare your child, see infant test or procedure preparation.

How the test will feel

While the blood sample is being obtained, your child will most likely feel a prick and a brief stinging sensation.

Why the test is performed

This test is used to screen infants for certain infections that are spread from the mother to her baby. Infections like toxoplasmosis, cytomegalovirus, herpes simplex, syphilis and others may lead to birth defects, growth delay, and neurological problems.

In some cases, the mother may also need to be tested to help diagnose certain infections.

Normal Values

Normal values vary from lab to lab.

What abnormal results mean

If high levels of immunoglobulin IgM against a particular substance are detected in the infant, there may be an infection. Further tests must be done to confirm a diagnosis.

What the risks are

Blood draws carry a small risk of bleeding, bruising, and infection at the involved site.

Special considerations

The TORCH screen is useful in narrowing down the possibility of a congenital infection, but if the result is positive, a definitive diagnosis will require additional testing. The mother will also need to be evaluated in order to interpret the newborn's blood tests.

Review Date: 5/12/2009

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Information developed by A.D.A.M., Inc. regarding tests and test results may not directly correspond with information provided by UCSF Medical Center. Please discuss with your doctor any questions or concerns you may have.