On July 31, President Donald Trump signed an executive order that would bring the set of physical exercises back Christopher Rudolph is a contributing writer for PEOPLE. He previously covered ...

If your doctor suspects you have one of several diseases, they may want to perform an “enzyme-linked immunosorbent assay” test. This is more commonly known as an ELISA test, and it can help to confirm ...

For many students and young adults, hearing about the Rice Purity Test can be a bit confusing. You might have seen friends ...

What is a cell proliferation assay? Cell proliferation assays are in vitro techniques. Methods differ in how sensitive they are, their compatibility with high-throughput analysis, and their ...

Doctors may order a cyclic citrullinated peptide (CCP) antibody test and other exams to confirm or rule out a rheumatoid arthritis (RA) diagnosis. A positive CCP antibody test doesn’t necessarily mean ...

A complement C4 (also known as a complement component 4, or simply C4) is a test to measure the level of C4 proteins you have in your blood. These proteins play a role in how your immune system ...

Antigen tests can identify the presence of antigens within the body, which are substances that cause immune responses, such as the release of antibodies. The immune system, and antibodies specifically ...

In 1985, graphic novelist Alison Bechdel came up with criteria for whether she'd watch a movie. It's become known as the Bechdel test, and it's surprisingly hard for films to pass these days. After ...

A polymerase chain reaction (PCR) test detects genetic material from a pathogen or abnormal cell sample. Ways of collecting samples include a nasal swab, a saliva swab, or taking a sample of blood.