When and why

A serology test is a test on a sample on blood. The test is used to detect the presence of specific antibodies in the blood, to assess whether the individual has previously been exposed to specific infections.

Examples of specific serology tests are Toxoplasma, CMV, syphilis and hepatitis serology. These tests may be performed as part of the routine monitoring of HIV infection or to help the doctor reach a diagnosis.

How it will help

The presence of antibodies to an infection indicates that the individual has previously been infected. With some infections, people who have severe damage to their immune system are at risk of re-activation. Knowledge of this risk allows treatments to be started which can prevent or reduce this risk (prophylaxis).