An instrument that measures the concentration or amount of hemoglobin (oxygen-carrying protein) in blood samples.
From 'hemo-' (blood) + 'globin' (the protein part of hemoglobin, from Latin 'globus' meaning ball/sphere) + '-meter' (measure). Developed in the late 19th century as laboratory medicine expanded, allowing quantitative analysis of blood components.
Early hemoglobinometers were beautifully simple—they compared blood colors to a standard chart, because darker blood meant more hemoglobin, just like stronger tea looks darker. This visual shortcut let doctors diagnose anemia before electronic measurements existed.
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