Definition

1. Noun:
   • A coagulation factor formed in the kidney under the influence of vitamin K: Cothromboplastin is a specific protein substance (a factor) that is essential for the blood clotting process. It is synthesized in the kidneys, and its production requires vitamin K.

Usage Examples

• Noun:
  • A deficiency in vitamin K can impair the synthesis of cothromboplastin.
  • The doctor explained that the patient's bleeding disorder was linked to low levels of cothromboplastin.

Advanced Usage

• Medical Context: The term is used almost exclusively in specialized medical, hematological, or biochemical contexts when discussing the coagulation cascade—the series of steps that lead to blood clot formation.
  • The laboratory test measured the activity of several coagulation factors, including cothromboplastin.

Variants and Related Words

• Factor VII: This is the more common and standard medical term for cothromboplastin. It is one of the serine protease enzymes in the coagulation cascade.
  • The patient was diagnosed with a hereditary deficiency of Factor VII.

Synonyms

• Factor VII: The direct and primary synonym in medical terminology.
• Proconvertin: An older, less common synonym for this coagulation factor.

Notes on Meaning

• Specificity: "Cothromboplastin" is a highly technical term. In modern clinical practice, "Factor VII" is the preferred term. "Cothromboplastin" may be encountered in older texts or in specific regional medical literature.
• Function: It acts early in the extrinsic pathway of blood coagulation, initiating the clotting process in response to tissue injury.

Noun

1. a coagulation factor formed in the kidney under the influence of vitamin K