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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

These tests can include chest X-rays, swabbing the inside of the mouth or nose, pulse oximetry to detect levels of oxygen and blood tests. —Sacbee.com, 23 Jan. 2026

According to the suit, the practitioners didn’t order blood tests for Lindsay, often met with her virtually when in-person visits would have been more conducive to treatment, and failed to fully comprehend the severity of her deterioration. —Colleen Cronin, Boston Herald, 22 Jan. 2026

There is also a blood test that looks for antibodies linked to cedar pollen allergy. —Miriam Fauzia, Dallas Morning News, 20 Jan. 2026

The rescue paid about another $1,000 for other medical treatment, such as blood tests, according to Peralta. —Jack Perry, The Providence Journal, 16 Jan. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)