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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

The team predicts that, within five years, blood tests for early Parkinson’s diagnoses could become more common within clinical practice. —Angelica Stabile, FOXNews.com, 31 Jan. 2026

Unlike with an infection, where doctors can use an objective blood test to pinpoint the bacteria or virus causing the problem, there are few simple tests to determine what kind of mental health disorder someone has. —Jen Christensen, CNN Money, 28 Jan. 2026

When an initial blood test suggested a boy was on the way, her parents shared the news. —Ronnie Li, USA Today, 27 Jan. 2026

The Bexar County District Attorney’s Office pushed to keep Meza Gonzalez’s blood test results from the public while her case remained open. —Megan Rodriguez, San Antonio Express-News, 27 Jan. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)