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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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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
The researchers then compared the results to show how their blood test compared to colonoscopy.
—Thomas G. Moukawsher, Newsweek, 30 Jan. 2025
Montgomery’s team has closely tracked Looney's recovery through blood tests and other measurements since the Nov. 25 surgery.
—Landon Mion, Fox News, 26 Jan. 2025
Discharged just 11 days after the Nov. 25 surgery, Montgomery's team has closely tracked her recovery through blood tests and other measurements.
—CBS News, 25 Jan. 2025
For example, a blood test can detect alcohol for up to 12 hours, whereas a breath test can detect the substance for 12 to 24 hours.
—Angelica Bottaro, Verywell Health, 23 Jan. 2025
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Word History
First Known Use
1851, in the meaning defined above
Dictionary Entries Near blood test
Cite this Entry
“Blood test.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20test. Accessed 2 Feb. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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
Britannica English: Translation of blood test for Arabic Speakers
Britannica.com: Encyclopedia article about blood test
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