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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Additionally researchers are working on advanced blood tests that could look for hallmarks of the disease. —Aria Bendix, NBC news, 2 May 2026

Key pieces of evidence were excluded, including entries from her diary and blood test results for alcohol and other substances, which were administered without proper adherence to due process, according to GQ. —Jordana Comiter, PEOPLE, 2 May 2026

The only reliable way to know is a 25-hydroxyvitamin D blood test, which is standard and widely available. —Allison Palmer, Sacbee.com, 30 Apr. 2026

To diagnose a bleeding disorder, your healthcare provider may need to review your symptoms, risk factors, medical history, and blood test results, the National Heart, Lung and Blood Institute noted. —Sara Moniuszko, USA Today, 30 Apr. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)