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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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.
She was admitted to the hospital, treated with antibiotics, and had a blood test confirming her suspicions of whooping cough. Ashley Vega, PEOPLE, 27 Oct. 2025 The blood test analyzes 460 different biomarkers across 19 organs and systems, then provides a detailed breakdown of how quickly each part of your body is aging. Allie Garfinkle, Fortune, 23 Oct. 2025 Fasting is defined as not eating for at least eight hours before the blood test. Patty Weasler, Verywell Health, 23 Oct. 2025 The researchers compared the standard screenings alone to the standard screenings plus the blood test. Angelica Stabile, FOXNews.com, 21 Oct. 2025 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

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Cite this Entry

“Blood test.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20test. Accessed 30 Oct. 2025.

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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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

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