Wait at least nine days after unprotected sex to take a pregnancy test. The best time to take a pregnancy test is the first day after a missed period. You should wait 21 days after unprotected sex if ...

An IgE blood test measures antibodies to help diagnose allergies. High levels of IgE antibodies can mean you have an allergy to something. Your healthcare provide may do additional testing to ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Michael Rosenston is a fact-checker and researcher with expertise in business, finance, and insurance. Julie Bang / Investopedia A Z-test evaluates the significance of a sample mean's difference from ...

What are some common liver tests? A series of blood tests can often find out if the liver is inflamed, injured, or working normally. These tests can also tell the difference between acute and chronic ...