A detailed written description or study of blood and its properties, or a method of recording blood-related medical information.
From Greek 'haima' (blood) + 'graphia' (writing or description). The term combines the medical root for blood with the suffix indicating documentation or detailed recording, evolving in medical usage to describe systematic blood analysis.
Before modern blood tests, doctors literally had to write down everything they observed about blood—color, thickness, smell—making hematography one of the earliest forms of patient data collection in medicine.
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