Rh-negative blood
- noun
- /ɑrˈeɪtʃ ˈnɛɡətɪv blʌd/
- Specialized
- Patients with Rh-negative blood require special care during pregnancy to avoid complications.
Examples
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She has Rh-negative blood.
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A blood transfusion can be risky if a person with Rh-negative blood receives Rh-positive blood.
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Before a transfusion, doctors check if the patient has Rh-negative blood to avoid complications.
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People with Rh-negative blood can donate to both Rh-negative and Rh-positive recipients.
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Pregnant women with Rh-negative blood may need special care if the baby is Rh-positive.
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Many people with Rh-negative blood may need special care.
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Only about 15% of the population has Rh-negative blood, making it a rarer blood type.
Synonyms
A blood group in which red blood cells do not have the Rh factor
Surface Forms
Morphology
The phrase is a straightforward adjective+noun composition: 'Rh-negative' (= lacking the Rh factor) modifies 'blood', so the meaning 'blood that does not have the Rh antigen' is directly derivable from the parts. Although clinical terminology, the morphological and semantic combination follows regular English patterns, so a B1 learner who knows both constituents would understand it.
Etymology
Rh-negative blood gets its name from tests on a kind of monkey called the rhesus monkey, where doctors found a small marker on red blood cells. Rh is that marker and negative means it is not there, so the term means 'blood that does not have the Rh marker' and this matters for pregnancy and blood transfusions.