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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
There are devices for sleep, movement and recovery, along with apps, blood tests and other technologies that can generate information throughout the day. — Mick Safron, Forbes.com, 1 Sep. 2026 Biomarkers can be collected through blood tests, imaging scans and other methods that reveal factors associated with a specific disease. — Anand Kumar, The Conversation, 26 Aug. 2026 The process has to start with a blood test, ideally ordered by a trichologist or a dermatologist who specializes in scalp and hair who knows what to look for in your results. — Maggie Ryan, Flow Space, 25 Aug. 2026 Instead of using p-tau217 and amyloid blood tests for diagnosis, Isaacson runs them to look for clues on how people are responding to treatment and lifestyle changes. — Sandee Lamotte, CNN Money, 24 Aug. 2026 See All Example Sentences for blood test

Word History

First Known Use

1851, in the meaning defined above

Time Traveler
The first known use of blood test was in 1851

Rhymes for blood test

See All Rhymes for blood test

Browse Nearby Words

blood sugar
blood test
blood thinner
See all Nearby Words

Cite this Entry

“Blood test.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20test. Accessed 2 Sep. 2026.

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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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

More from Merriam-Webster on blood test

Britannica.com: Encyclopedia article about blood test

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