Definition

Noun: - A blood group antigen: The Rh factor is a specific protein (antigen) found on the surface of red blood cells. Its presence or absence determines an individual's Rh blood type (Rh-positive or Rh-negative).

Usage

The term "Rh factor" is used primarily in medical and biological contexts to classify blood types and discuss compatibility for blood transfusions and pregnancy. - The patient's blood test confirmed she was Rh-negative, lacking the Rh factor. - Compatibility of the Rh factor is crucial to prevent adverse reactions during a transfusion.

Advanced Usage

• "Rh incompatibility": A condition that can occur when an Rh-negative mother carries an Rh-positive baby, potentially leading to health issues for the baby. This is a direct consequence of the mismatched Rh factor.
  • The doctor monitored the pregnancy closely due to potential Rh incompatibility.

Variants and Related Words

• Rh-positive (adj.): Describing blood that has the Rh factor antigen present on the red blood cells.
  • Approximately 85% of the population is Rh-positive.
• Rh-negative (adj.): Describing blood that lacks the Rh factor antigen on the red blood cells.
  • She has a rare blood type: O negative, which is both O and Rh-negative.

Synonyms

• Rhesus factor: A full, synonymous name for the Rh factor, derived from the Rhesus monkeys in which it was first identified.

Notes on Meaning

The Rh factor is a key determinant in the Rh blood group system, one of the most important systems for blood typing alongside the ABO system. Its significance lies in immune response; an Rh-negative person can develop antibodies if exposed to Rh-positive blood.

Noun

1. a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia