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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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 blood test screens for cancer. —Nicole Fallert, USA Today, 6 Nov. 2025

Some patients may also notice changes in blood test results, like lower levels of blood cells or certain minerals, which doctors can monitor during treatment. —Melissa Rudy, FOXNews.com, 4 Nov. 2025

Currently, heart failure is generally detected through a range of tests such as clinical evaluation, blood tests and imaging, which can be geographically and financially restrictive. —New Atlas, 3 Nov. 2025

At this point, scientists don’t have a simple blood test or scan that can detect CTE in a living person. —Jen Christensen, CNN Money, 30 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)