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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Using patients' genetics and blood tests, tailors anti-rejection medications to them. —Nicole Villalpando, Austin American Statesman, 5 Mar. 2026

In some cases, a blood test can assess immunity. —Katia Hetter, CNN Money, 5 Mar. 2026

Multiple blood tests and 108 pelvis, transabdominal and transvaginal ultrasound images later, my ER doctor informed me of a possible ovarian cyst rupture. —Angelica Zhiyu Luo, SELF, 3 Mar. 2026

Norton also pointed to several emerging technologies that may help detect breast cancer earlier and lead to more effective treatment even in low-income areas, including digital pathology, diagnostic blood tests, and cancer-preventing vaccines. —Victoria Kusztos, ABC News, 2 Mar. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)