Algorithms for Calculating and Correcting Blood-gas and Acid-Base Variables,
Abstract
This is a review of equations available for correcting PO2, PCO2, and pH for temperature and for estimating blood-gas and acid-base variables from measured values: (1) Oxygen saturation (SO2) from PO2, PCO2, pH, and body temperature (T); (2) oxygen concentration from SO2, PO2, and hemoglobin concentration (HB); (3) PO2 at half-saturation (P50) from PO2, SO2, pH, PCO2, and T; (4) 'in vivo P50' from PO2, SO2, and T; (5) base excess (BE) from pH, PCO2, and Hb; (6) 'in vivo BE' (BE3) from pH and PCO2; (7) 'compensated BE3' from PCO2; and (8) bicarbonate and carbon dioxide concentrations from pH and PCO2. Physiologic considerations are emphasized, with mathematical background when it contributes to understanding. Algorithms are variously compared with their graphic counterparts, with the data from which they were derived, and with each other.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 27, 1978
- Accession Number
- ADA075004
Entities
People
- Ronald A. Gabel
Organizations
- United States Army Research Institute of Environmental Medicine