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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Standard blood tests that count how many red blood cells a person has won’t catch iron deficiency that has not progressed into anemia. — Amanda Schupak, CNN Money, 23 Oct. 2026

The team at the University of California, San Francisco, who conducted the study, used blood tests to measure five different signaling molecules involved in inflammation in participants, both before and after two sessions with psilocybin. — Will Stone, NPR, 21 Oct. 2026

The company crumbled after John Carreyrou, then a reporter for The Wall Street Journal, broke the story in 2015 that Theranos wasn’t using its own technology to run most of its blood tests. — Elizabeth Lopatto, The Verge, 20 Oct. 2026

The actual Edison device that Theranos used was an eight-channel pipette inside a black box that used the same chemistry and detection methods that have been used for blood tests since the 1970s. — Tyler Shultz, STAT, 19 Oct. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)