As a matter of fact, these test tubes are characterized by such features that make them extremely easy to use: for example, the presence of an arrow to indicate the blood level, the convenience in ...

Medically reviewed by Chika Anekwe, MD A potassium blood test is used to measure the amount of potassium in your blood. It is ...

A test for fecal occult blood looks for blood in your poop ... such as colonoscopy (in which the doctor uses a flexible tube with a tiny camera on it to check your entire colon); CT colonography ...

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