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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

This is a simple blood test that's widely available, and increasingly many primary care physicians offer it as part of preventive care. —Allison Aubrey, NPR, 13 Mar. 2026

In depression, for example, about a quarter of patients have elevated levels of an inflammatory protein, called C-reactive protein, that can be found through a blood test. —Jamie Ducharme, USA Today, 12 Mar. 2026

The test, which also analyzes data such as weight, height, last menstrual period, and hormone levels, identifies patterns and predicts outcomes that a standard blood test cannot. —Alexa Mikhail, Flow Space, 11 Mar. 2026

The blood test looks for high levels of a protein called p-tau217, indicating plaques in the brain that are a hallmark of Alzheimer’s disease. —Emily Kay Votruba, EverydayHealth.com, 10 Mar. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)