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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

In the latest update from the Vatican, the press office said Leo underwent blood tests and a chest X-ray on Friday morning. — Barbie Latza Nadeau, CNN Money, 16 Oct. 2026

The Vatican says post-operative blood tests and a chest X-ray show no immediate complications. — Stephanie Stahl, CBS News, 14 Oct. 2026

From that came the evidence that HIV causes AIDS and the development of the blood test that helped protect the blood supply. — Robert C. Gallo, STAT, 9 Oct. 2026

Thus, the use of clozapine is associated with close medical monitoring for some patients, in the form of blood tests to measure the absolute neutrophil count. — Encyclopedia Britannica, 7 Oct. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)