The venereal disease research laboratory test (VDRL) is a blood test that can identify syphilis infections. Syphilis is one of the most common sexually transmitted infections (STIs). The Centers for ...

Polymerase chain reaction (PCR) and rapid (antigen) tests for COVID-19 both involve taking a swab. Results for a PCR test take longer, as it needs to go to a laboratory. It is more costly but tends to ...

Cytomegalovirus (CMV) is a common virus. According to the Centers for Disease Control and Prevention (CDC), it infects between 50 to 80 percent of all adults by the time they reach 40 years old.

A cortisol level test uses a blood sample to measure the level of cortisol in your blood. Cortisol is a steroid hormone released by the adrenal glands. The adrenal glands sit on top of your kidneys. A ...

Sapha Shibeeb does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...