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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Kan highlights cautious optimism from new diagnostic blood tests and disease-modifying drugs, and stresses lifestyle changes as the most accessible path to brain health. — Sue Peschin, Forbes.com, 4 Aug. 2026

There are already a variety of mail-in blood tests out there. — Emily Forlini, Fortune, 3 Aug. 2026

The latest blood tests show Jackie is still anemic, but one measure of her red blood cell count has improved to 17%, according to the Ojai Raptor Center. — Anthony Thompson, USA Today, 1 Aug. 2026

When the disorder arises, it’s considered a medical emergency, so running blood tests, measuring hormone levels or getting a patient into a magnetic resonance imaging (MRI) machine for tests isn’t always feasible. — Jackie Flynn Mogensen, Scientific American, 31 July 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)