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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

At the time of the blood test, Perez also had in his system THC, the primary psychoactive compound in marijuana, according to the DA’s Office. — Rosalio Ahumada, Sacbee.com, 2 Oct. 2026

There’s a place for topical solutions and other hair loss treatments (including minoxidil), but blood tests are the first step to uncovering the underlying cause of shedding. — Maggie Ryan, Flow Space, 2 Oct. 2026

Depending on a person’s health insurance, the cost of blood tests may not be covered unless ordered by a doctor for medical reasons, such as concerning health symptoms. — Renée Onque, CNBC, 29 Sep. 2026

While blood tests for cancer already exist in the market, none that screen for multiple cancers has undergone safety and accuracy reviews to win FDA approval so far. — Yuki Noguchi, NPR, 23 Sep. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)