haemoglobin
Low-medium frequencyFormal, technical, medical
Definition
Meaning
The red protein in red blood cells responsible for transporting oxygen from the lungs to the body's tissues and returning carbon dioxide from the tissues back to the lungs.
Can also refer to the measurement of this protein's concentration in blood, often as a clinical health indicator, and in scientific contexts to related compounds (e.g., oxyhaemoglobin, deoxyhaemoglobin).
Linguistics
Semantic Notes
A countable noun in biochemistry (e.g., 'different haemoglobins'), but often uncountable in medical contexts (e.g., 'low haemoglobin'). The concept is central to discussions of blood, anaemia, oxygen transport, and respiration.
Dialectal Variation
British vs American Usage
Differences
The primary difference is spelling: 'haemoglobin' (UK, Commonwealth) vs. 'hemoglobin' (US). Pronunciation differs accordingly.
Connotations
Identical scientific meaning and usage; the spelling variant signals the regional origin of the text or speaker.
Frequency
The spelling 'haemoglobin' is virtually exclusive to UK/Commonwealth publications. The US spelling 'hemoglobin' is dominant in American English and in much international scientific literature.
Vocabulary
Collocations
Grammar
Valency Patterns
haemoglobin level of [number]haemoglobin in the bloodto bind to haemoglobinto have a haemoglobin of [number]Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Academic
Frequently used in biology, biochemistry, physiology, and medicine papers, lectures, and textbooks.
Everyday
Used in healthcare discussions, especially regarding blood tests, anaemia, and general wellness checks.
Technical
Core terminology in haematology, clinical pathology, sports science (oxygen transport), and biochemistry.
Examples
By Part of Speech
adjective
British English
- haemoglobin-related disorders
- haemoglobin deficiency
American English
- hemoglobin-related disorders
- hemoglobin deficiency
Examples
By CEFR Level
- The doctor said my haemoglobin is good.
- A simple blood test can measure your haemoglobin levels.
- Iron is a crucial component for the production of haemoglobin.
- Genetic mutations can result in abnormal haemoglobins, such as sickle-cell haemoglobin, which impair oxygen transport.
Learning
Memory Aids
Mnemonic
Think of 'HAEMO' (related to blood) + 'GLOBIN' (a type of protein) = the blood protein that carries oxygen.
Conceptual Metaphor
The body's oxygen delivery van/truck.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'гемоглобин' – it's a direct cognate, same meaning.
Common Mistakes
- Incorrect spelling in the wrong regional context (e.g., using 'haemoglobin' in a US journal).
- Mispronouncing the first syllable as /heɪ/ or /hæ/ instead of /hiː/.
- Using it as a verb (e.g., 'the blood haemoglobins oxygen' is incorrect).
Practice
Quiz
Which element is central to the function of haemoglobin?
FAQ
Frequently Asked Questions
Red blood cells are the cells that contain haemoglobin. Haemoglobin is the specific protein inside them that carries oxygen.
It is primarily uncountable when referring to the substance (e.g., 'Her haemoglobin is low'). It can be countable in biochemistry when referring to different types or molecules (e.g., 'Mammals have various haemoglobins').
It comes from the Greek 'haima' (blood), and in scientific Latin/Greek borrowings, 'ae' is often pronounced /iː/ in English.
It measures the percentage of haemoglobin that has glucose attached to it, providing an average of blood sugar levels over the past 2-3 months, crucial for diabetes management.