The conventions for use of the SI (International System of Units; le Système International d'Unités) in medicine (1, 2): include decimal fractions as replacements for percentages: 0.45 rather than 45%; 0.03 rather than 3%. The most frequently reported hematologic measurements to which this rule applies are hematocrits and leukocyte differential counts. The hematocrit has been conventionally defined as the fraction of a column of blood within a glass tube that contains the blood cellular elements packed at the bottom of the column after centrifugation. (Some electronic methods estimate hematocrit by other means but the meaning of the measurement remains the
Style Notes: Decimal Fractions for Hematologic Units. Ann Intern Med. ;109:182. doi: 10.7326/0003-4819-109-3-182
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Published: Ann Intern Med. 1988;109(3):182.
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