Psychology Today's online self-tests are intended for informational purposes only and are not diagnostic tools. Psychology Today does not capture or store personally identifiable information, and your ...

A complement blood test measures how well complement proteins in your blood support immune defense. The complement system helps antibodies fight germs and clear foreign substances. Complement testing ...

What Is a Cortisol Test? A cortisol test measures the level of cortisol in your blood, urine or saliva. Cortisol is a hormone that's important throughout the body for maintaining blood pressure, blood ...

Psychology Today's online self-tests are intended for informational purposes only and are not diagnostic tools. Psychology Today does not capture or store personally identifiable information, and your ...

Food intolerances, food sensitivities, and food allergies can all produce negative symptoms, ranging from undesirable to downright dangerous. Food intolerances can produce uncomfortable or ...

Eosinophils are a kind of white blood cell that helps fight disease. The exact role of eosinophils in your body isn't clear, but they're usually linked with allergic diseases and certain infections.

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PCR tests are very accurate and can find the virus even in people without symptoms. Rapid tests can be done at home and show results in minutes. It's important to follow instructions closely when ...

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Pregnant women should be tested for group B strep at 36 or 37 weeks. Positive group B strep tests in pregnant women mean they will get antibiotics during labor. Group B strep can cause dangerous ...