F1.2

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** The two peptides that can be released by proteolytic activation of prothrombin to thrombin. The level of these fragments is directly proportional to the amount of active thrombin in a blood sample.

**Synonyms:** - F1+2 - F1-2 - Pro-Thrombin Activation Fragment - Prothrombin Activation Fragment - Prothrombin Activation Fragment F1-2 - Prothrombin Activation Fragment F1.2