blood test

noun

: a test of the blood

specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of a particular disease or medical condition (such as diabetes, cardiovascular disease, or cancer) or serve to indicate the degree of function of a specific organ (such as the liver or kidney)

Examples of blood test in a Sentence

He had a blood test, and the doctor who did it said his cholesterol was too high.

Recent Examples on the Web

It is diagnosed with a blood test and can be treated with medication. —Joyann Jeffrey, PEOPLE, 11 Apr. 2026

But blood tests showed elevated levels of two enzymes, known as AST and CK, the website said. —Sharon Bernstein, Sacbee.com, 8 Apr. 2026

The Sacramento district attorney’s office declined to file charges after a blood test showed there were no traces of drugs or alcohol in her system. —Clara Harter, Los Angeles Times, 7 Apr. 2026

Standard blood tests frequently miss low levels, so even if your doctor said things looked fine, that doesn’t necessarily tell the whole story. —Allison Palmer, Charlotte Observer, 6 Apr. 2026

Word History

First Known Use

1851, in the meaning defined above

Rhymes for blood test

• abreast
• accessed
• addressed
• appressed
• armrest
• arrest
• assessed
• attest
• backrest
• behest
• bequest
• caressed

Kids Definition

blood test

noun

: a test of the blood (as to detect the presence of disease-causing agents or determine the number of blood cells)

Medical Definition

blood test

noun

: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of a particular disease or medical condition (as diabetes, cardiovascular disease, or cancer) or serve to indicate the degree of function of a specific organ (as the liver or kidney)