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PubMed1979

SI units.

The development of the International System of Units (Systeme International d'Unites--SE Units), based on seven fundamental quantities--length, mass, time, electric current, thermodynamic temperature, luminous intensity, and amount of substance is described. Units (coherent and noncoherent) for other measurable quantities that are derived from the seven basic quantities are reviewed. The rationale for the use of SE units in medicine, primarily as applied to clinical laboratory data, is discussed, and arguments are presented for the rigid adoption of SI units in medicine and for exceptions. Tables are given for the basic and derived SI units used in medicine and for conversion factors from the quantities and units in current use to those in SI units.

Blood Chemical Analysis↗
PubMed1979

[The Davenport diagram and the international system of units].

The implantation of the international system of units in medical science leads to revising the Davenport diagram. This diagram has been widely used for 20 years as a system displaying the variations in acid-base equilibrium. In order to conserve its familiar aspect the coordinates are: a pH abscissa complete with a scale of H+ ion concentrations (nmol.l-1) and an ordinate using real plasma HCO-3 concentrations. The isobars of PCO2 are reconstructed for whole and semi-whole kilopascal values (kPa). The real plasma buffer lines are reconstructed for 3, 6 and 9 n.mmol.-1 of monomeric hemoglobin which are the nearest whole values of 5, 10 and 15 g of Hb/100 ml. The diagram is calculated for 37 degrees C and the constants used for pK' and aCO2 are the most recently suggested values.

Acid-Base Equilibrium↗