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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

John Hancock also partners with companies that offer advanced screening tests, giving members discounted access to early detection blood tests and MRI scans that can screen for hundreds of conditions. —Allison Aubrey, NPR, 25 May 2026

Teams move fast to obtain blood tests, look for signs of organ dysfunction, start IV fluids and antibiotics and identify the source of infection through cultures or imaging. —Dr. Jamin Brahmbhatt, CNN Money, 24 May 2026

New research published by the Alzheimer’s Association explored the link between a person’s biological age, determined through a blood test, and all-cause dementia risk. —Angelica Stabile, FOXNews.com, 23 May 2026

Further drops in mortality came in October 2025, when hospitals prioritized sepsis, getting more machines to run more blood tests and instituting workflows to pair the correct antibiotic with the associated infection, among other changes. —Jessica Bartlett — Boston Globe, STAT, 21 May 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)