blood serum

noun

: the clear yellowish fluid that remains from blood plasma after clotting factors (such as fibrinogen and prothrombin) have been removed by clot formation

Examples of blood serum in a Sentence

Recent Examples on the Web

Pilot studies have detected QACs in human blood serum, breast milk, urine and feces. — Sandee Lamotte, CNN Money, 7 Aug. 2026

Of the successful claims, two of the men were cleared by DNA evidence, while blood serum evidence was used to prove innocence in the third. — Richard A. Webster, ProPublica, 6 Aug. 2026

Of the 25 people who received blood serum testing, one asymptomatic veterinary professional showed evidence of a H5N1 infection after exposure to a cat infected with the disease. — Christopher Edwards, PEOPLE, 14 May 2026

The defense has argued that, instead of testing a whole blood sample from Higgins, a sample of his blood serum was used, which led to a higher BAC. — Hailey Salvian, New York Times, 11 May 2026

Word History

First Known Use

1801, in the meaning defined above

Rhymes for blood serum

• theorem

Kids Definition

blood serum

noun

: blood plasma from which certain substances (as fibrinogen) involved in the clotting of blood have been removed

Medical Definition

blood serum

noun

: serum sense a(1)