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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

By contrast, companies like Function Health (cost is $365) and InsideTracker ($489 for a blood test & annual membership) now offer panels of 50–250+ markers, making comprehensive testing accessible without a doctor’s order. — Jesse Pines, Forbes.com, 20 July 2026

If low testosterone is confirmed, doctors may order additional blood tests to determine the underlying cause, including luteinizing hormone (LH), which helps distinguish whether the problem originates in the testes, pituitary or hypothalamus. — Melissa Rudy, FOXNews.com, 20 July 2026

But no brain scan or blood test can diagnose the condition, so clinicians must rely on a person’s own account—or their parent’s account—of their challenges. — Olga Khazan, The Atlantic, 20 July 2026

In recent years, the Centers for Disease Control and Prevention began certifying testosterone blood tests for quality, accuracy, and reliability. — Beth Mole, ArsTechnica, 17 July 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)