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PubMed · 35496

Simple, accurate equations for human blood O2 dissociation computations.

J W Severinghaus
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Abstract

Hill's equation can be slightly modified to fit the standard human blood O2 dissociation curve to within plus or minus 0.0055 fractional saturation (S) from O less than S less than 1. Other modifications of Hill's equation may be used to compute Po2 (Torr) from S (Eq. 2), and the temperature coefficient of Po2 (Eq. 3). Variations of the Bohr coefficient with Po2 are given by Eq. 4. S = (((Po2(3) + 150 Po2)(-1) x 23,400) + 1)(-1) (1) In Po2 = 0.385 In (S-1 - 1)(-1) + 3.32 - (72 S)(-1) - 0.17(S6) (2) DELTA In Po2/delta T = 0.058 ((0.243 X Po2/100)(3.88) + 1)(-1) + 0.013 (3) delta In Po2/delta pH = (Po2/26.6)(0.184) - 2.2 (4) Procedures are described to determine Po2 and S of blood iteratively after extraction or addition of a defined amount of O2 and to compute P50 of blood from a single sample after measuring Po2, pH, and S.

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BloodHemoglobinsHumansHydrogen-Ion ConcentrationMathematicsOxygenJournal ArticleResearch Support, U.S. Gov't, P.H.S.

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J W Severinghaus. 1979. Simple, accurate equations for human blood O2 dissociation computations.. https://doi.org/10.1152/jappl.1979.46.3.599

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