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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Together, Van Der Beek and Guardant Health are also raising awareness about the Shield blood test, approved by the Food and Drug Administration last year, which can also detect colon cancer, though a colonoscopy remains the gold standard for diagnosis. —Charles Trepany, USA Today, 11 Feb. 2026

The commercial told you that screening starts with a simple blood test. —Dr. Jamin Brahmbhatt, CNN Money, 11 Feb. 2026

The blood test also checks for triglycerides, another type of fat in the blood that can contribute to heart disease. —Akshay Syal, NBC news, 8 Feb. 2026

Typically, a blood test is needed to diagnose the condition. —Mark Gurarie, Verywell Health, 8 Feb. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)