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specifically : a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (such as glucose, hemoglobin, or white blood cells) that indicate the presence or probable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

Hazelnuts may also lower HbA1c, a blood test that reflects the average blood sugar level over three months. —Cory Martin, Verywell Health, 6 Jan. 2026

After eight days in quarantine, X-rays, blood tests and a successful parasite treatment, Percy is recovering well. —Lucia Cheng, Des Moines Register, 6 Jan. 2026

Long-term care often also involves regular monitoring through blood tests, imaging and specialist visits to ensure disease activity remains under control. —Daryl Austin, USA Today, 5 Jan. 2026

Both companies also added on the ability to get blood tests to track metabolic health metrics last year. —Victoria Song, The Verge, 5 Jan. 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: a laboratory test in which a sample of blood is withdrawn from the body to analyze the level of substances or cells (as glucose, hemoglobin, or white blood cells) that indicate the presence or probable development of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)