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/ˌhimoʊˈɡloʊbɪn/ · noun
(American spelling) The iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body; it consists of a protein (globulin), and haem (a porphyrin ring with an atom of iron at its centre)..
Use hemoglobin when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hemoglobin means (American spelling) The iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body; it consists of a protein (globulin), and haem (a porphyrin ring with an atom of iron at its centre)..
Common synonyms include Hb, Hgb, HGB, haemoglobin.
The opposite depends on the specific sense.
Use hemoglobin where its definition matches the intended context.
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