Translation guide
The protein in red blood cells that carries oxygen. In Japanese, the standard term is ヘモグロビン, a katakana loanword from English. It is used in medical, biological, and everyday health contexts.
Referring to the substance haemoglobin itself, in medical, scientific, or general health contexts.
My haemoglobin level is low.
Haemoglobin is a protein found in red blood cells.
A kanji-based term literally meaning 'blood pigment'. More common in older medical texts or formal written contexts, but still understood.
Please measure the haemoglobin level.