blood serum: meaning, definition, pronunciation and examples
C1/C2Technical/Scientific/Medical
Quick answer
What does “blood serum” mean?
The clear, yellowish liquid component of blood that remains after clotting agents (fibrinogen) are removed.
Audio
Pronunciation
Definition
Meaning and Definition
The clear, yellowish liquid component of blood that remains after clotting agents (fibrinogen) are removed; the fluid part of blood without the cells.
A key biological fluid used in medicine and research, containing antibodies, hormones, electrolytes, and proteins. Often simply called 'serum' in medical contexts. It is distinct from plasma, as plasma retains clotting factors.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling follows standard regional conventions (e.g., 'analyse' vs. 'analyze' in surrounding text).
Connotations
None beyond the technical/medical field.
Frequency
Equally low-frequency in both dialects, confined to medical, scientific, and certain public health contexts.
Grammar
How to Use “blood serum” in a Sentence
N + of + blood serum (e.g., 'a sample of blood serum')blood serum + for + purpose (e.g., 'blood serum for testing')blood serum + from + source (e.g., 'blood serum from the patient')Vocabulary
Collocations
Examples
Examples of “blood serum” in a Sentence
verb
British English
- The lab will centrifuge the sample to blood-serum it.
- We need to blood-serum the donor sample for analysis.
American English
- The lab will centrifuge the sample to serum-separate it.
- We need to separate serum from the blood sample for analysis.
adverb
British English
- The protein was measured serum-wise.
- The analysis was performed serum-specifically.
American English
- The protein was quantified in the serum fraction.
- The analysis was performed on the serum component.
adjective
British English
- The serum-albumin level was checked.
- A serum-based assay was developed.
American English
- The serum albumin level was checked.
- A serum-based assay was developed.
Usage
Meaning in Context
Business
Rare. Possibly in biotech/pharmaceutical contexts regarding product development or testing.
Academic
Common in medical, biological, biochemical, and immunological research papers and textbooks.
Everyday
Very rare. May be encountered in medical news, doctor-patient discussions, or diagnostic reports.
Technical
Core term in clinical pathology, laboratory medicine, serology, and immunology.
Vocabulary
Synonyms of “blood serum”
Neutral
Weak
Vocabulary
Antonyms of “blood serum”
Watch out
Common Mistakes When Using “blood serum”
- Using 'blood serum' and 'plasma' interchangeably (they are processed differently).
- Pronouncing 'serum' with a hard /e/ as in 'set'; it's /ˈsɪər.əm/ or /ˈsɪr.əm/.
- Treating it as a countable noun (e.g., 'three blood serums'); it's usually uncountable (e.g., 'three samples of blood serum').
FAQ
Frequently Asked Questions
No. Plasma is the liquid component of unclotted blood and contains clotting factors like fibrinogen. Serum is what remains after blood clots and these factors are removed. They are collected using different laboratory procedures.
In medical and biological contexts, 'serum' is very commonly used as a shorthand for 'blood serum'. However, there are other types of serum (e.g., immune serum, foetal bovine serum), so 'blood serum' is used for absolute clarity.
It is used extensively for diagnostic testing (measuring hormones, antibodies, drugs, electrolytes), in medical research, and in the production of vaccines and therapeutic antibodies.
It is generally treated as an uncountable (mass) noun. You refer to 'a sample of blood serum' or '10 ml of blood serum', not 'a blood serum' or 'blood serums'.
The clear, yellowish liquid component of blood that remains after clotting agents (fibrinogen) are removed.
Blood serum is usually technical/scientific/medical in register.
Blood serum: in British English it is pronounced /ˈblʌd ˌsɪər.əm/, and in American English it is pronounced /ˈblʌd ˌsɪr.əm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of BLOOD separating: Cells go to the bottom, SERUM stays on top. 'Serum' sounds like 'see-room' – the clear liquid you can see room through.
Conceptual Metaphor
BLOOD SERUM IS A MESSENGER/CARRIER (it carries information and substances around the body). BLOOD SERUM IS A DIAGNOSTIC WINDOW (it reveals the body's state).
Practice
Quiz
What is the primary difference between blood plasma and blood serum?