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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

When meningitis is suspected, Joshua said doctors can use blood tests, brain imaging and a lumbar puncture to determine whether the infection is bacterial, viral or caused by something else. — Kelly McGreal, FOXNews.com, 6 Nov. 2026

But the past decade has brought remarkable progress, including blood tests that can identify proteins associated with the disease and treatments that help clear them from the brain. — Josephine Murphy, NBC news, 6 Nov. 2026

Molecular testing can be done at the time of an initial biopsy, later using tissue from that same biopsy or another biopsy, or via a blood test called a liquid biopsy. — Petra Guglielmetti, Glamour, 6 Nov. 2026

Your doctor may suggest a blood pressure measurement and blood tests for cholesterol and kidney function. — Matthew Nudy, The Conversation, 5 Nov. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)