rh-negative
Definition
Adjective 1. Lacking the Rh factor: Describes a person whose red blood cells do not have the Rh factor (Rhesus factor) antigen on their surface. This is a specific blood type characteristic. * Example: She is Rh-negative, so she requires special care during pregnancy if the baby is Rh-positive. * Example: Rh-negative blood can be safely transfused to another Rh-negative person.
Usage Notes
- The term is primarily used in medical, biological, and healthcare contexts, especially concerning blood typing, transfusions, and pregnancy.
- It is often written with a hyphen: Rh-negative. The "Rh" stands for "Rhesus," referring to the Rhesus monkey in which the factor was first identified.
- It is typically used to describe a person's blood type or the person themselves. It is the opposite of Rh-positive.
Examples in Context
- Medical Diagnosis/Description:
- The blood test confirmed that the patient is Rh-negative.
- Donors with Rh-negative blood are always in high demand.
- Medical Advice/Treatment:
- An Rh-negative mother may need an injection to prevent complications in future pregnancies.
- It is critical to match Rh-negative recipients with Rh-negative blood for transfusion.
Advanced Usage
- The term can be used attributively (before a noun) or predicatively (after a linking verb like "is" or "are").
- Attributive: The Rh-negative donor saved a life.
- Predicative: The donor is Rh-negative.
Variants and Related Words
- Rh factor (noun): The antigen present (or absent) on red blood cells that determines Rh status.
- Rh-positive (adjective): Describing a person whose red blood cells the Rh factor antigen.
- Blood type / Blood group (noun): The general classification of blood, including the ABO system (A, B, AB, O) and the Rh system (positive or negative).
Synonyms
- RhD-negative: A more precise clinical term specifying the absence of the RhD antigen, which is the most immunogenic part of the Rh factor.
Antonyms
- Rh-positive
Adjective
-
of persons (or their blood) lacking the Rh factor present in their red blood cells
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