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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Tests that can detect signs of the disease in a person's stool are available, and the Food and Drug Administration approved a blood test in 2024. —Ken Alltucker, USA Today, 12 Oct. 2025

Veronica Ewers said nothing, despite all the signs, despite the blood test results staring back at her, telling her the hormones in her body were barely present. —Megan Feringa, New York Times, 10 Oct. 2025

Scientists at the University of East Anglia (UEA) and Oxford BioDynamics have developed a highly accurate blood test to diagnose Chronic Fatigue Syndrome (CFS), also known as Myalgic Encephalomyelitis (ME/CFS). —Neetika Walter, Interesting Engineering, 9 Oct. 2025

These tests can include chest X-rays, swabbing the inside of the mouth or nose, pulse oximetry to detect levels of oxygen and blood tests. —Sacbee.com, 9 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)