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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Sickle-cell trait, which is diagnosed through a blood test, doesn’t usually affect people's daily lives. — ABC News, 6 July 2026

In September 2025, Maxton had two blood tests done and was later diagnosed with acute lymphoblastic leukemia. — Vanessa Etienne, PEOPLE, 6 July 2026

Diagnostics as basic as blood tests, ultrasounds, or electrocardiograms cannot currently be performed in Cuba due to the lack of basic services. — Sarah Moreno july 1, Miami Herald, 1 July 2026

Your blood tests may reveal elevated cholesterol levels, prompting them to order unnecessary tests, increase your dose, or prescribe an additional medication. — Colleen Doherty, Verywell Health, 25 June 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)