complement fixation: meaning, definition, pronunciation and examples
C2 (very low frequency, highly technical)Scientific/Medical
Quick answer
What does “complement fixation” mean?
The binding and activation of serum complement proteins by an antigen-antibody complex, a key step in immune defense.
Audio
Pronunciation
Definition
Meaning and Definition
The binding and activation of serum complement proteins by an antigen-antibody complex, a key step in immune defense.
A laboratory test measuring this reaction to detect the presence of specific antibodies or antigens.
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference. Spelling follows the standard US/UK conventions (e.g., 'labour/labor' not part of term).
Connotations
Purely technical; no differential connotations.
Frequency
Equally rare and specialized in both varieties.
Grammar
How to Use “complement fixation” in a Sentence
undergo complement fixationperform a complement fixation testtest positive/negative for complement fixationVocabulary
Collocations
Examples
Examples of “complement fixation” in a Sentence
adjective
British English
- The complement-fixation assay yielded clear results.
American English
- We need complement-fixation reagents for the panel.
Usage
Meaning in Context
Academic
Used in immunology and microbiology textbooks and research papers to describe a fundamental immune mechanism and diagnostic technique.
Everyday
Not used in everyday conversation.
Technical
Core term in clinical diagnostics, virology, and immunology labs (e.g., 'The sample was analyzed using complement fixation.')
Vocabulary
Synonyms of “complement fixation”
Neutral
Weak
Vocabulary
Antonyms of “complement fixation”
Watch out
Common Mistakes When Using “complement fixation”
- Incorrect: 'complementary fixation' (confusion with 'complementary').
- Incorrect: using it as a verb (e.g., 'the serum complement fixated').
FAQ
Frequently Asked Questions
It is a two-word noun phrase, always written as separate words.
To detect the presence of specific antibodies in a patient's serum, indicating exposure to a particular pathogen.
It has been largely superseded by more sensitive and automated methods like ELISA, but it remains a historically important technique and is sometimes used in reference labs.
No. It refers to the 'complement system,' a group of proteins in the blood that aid the immune response.
The binding and activation of serum complement proteins by an antigen-antibody complex, a key step in immune defense.
Complement fixation is usually scientific/medical in register.
Complement fixation: in British English it is pronounced /ˈkɒmplɪmənt fɪkˈseɪʃən/, and in American English it is pronounced /ˈkɑːmpləmənt fɪkˈseɪʃən/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of 'fixation' as 'locking in.' The complement system is 'fixed' or locked onto the antigen-antibody complex.
Conceptual Metaphor
A SECURITY SYSTEM ALARM: The antigen-antibody complex 'triggers' the complement proteins, which then 'sound the alarm' (cause inflammation, cell lysis) to eliminate the threat.
Practice
Quiz
In which field is the term 'complement fixation' primarily used?