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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Sleep problems Men can ask their primary care doctors to perform a blood test to check their testosterone levels, Munger advised. —Shiv Sudhakar, FOXNews.com, 4 Oct. 2025

Researchers at the University of Vienna in Austria linked physical fitness in older adults to changes in blood markers, exploring whether simple blood tests can reflect how someone is aging, according to a new study published in Nature. —Reed Albergotti, semafor.com, 3 Oct. 2025

There are blood tests now (though not accessible to every pregnant person) that can detect your baby’s gender and conveniently send that information directly to your inbox. —Elisabeth Sherman, Parents, 2 Oct. 2025

Your doctor can check your cholesterol levels with a simple blood test. —Tom Gavin, EverydayHealth.com, 2 Oct. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)