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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Thyroid function This blood test can be done yearly to evaluate how well your thyroid gland is functioning, according to Caamano. —Melissa Rudy, FOXNews.com, 8 Dec. 2025

According to Towle, her blood test did not actually show a promising turn of events; her oncologist had made a mistake. —Zoey Lyttle, PEOPLE, 5 Dec. 2025

The panel also approved, 6–4, a proposal encouraging parents to speak with pediatricians about blood tests to check whether children develop protective antibodies — a practice not standard in pediatrics. —Gabe Whisnant, MSNBC Newsweek, 5 Dec. 2025

Back home in San Diego, her parents immediately took her to the hospital and a blood test confirmed the diagnosis of Type 1 diabetes. —Karen Billing, San Diego Union-Tribune, 3 Dec. 2025

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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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