A method was developed for the preparation of carboxyhemoglobin (COHB) standards, which were stable for more than four months with the prepared control remaining within acceptable limits during this time. A mathematical equation was developed to more accurately determine the constants A and B used in the equation COHB% = 100[(C − B)/(A − B)]; where B = 0% COHB peak ratio at 540 nm and 579 nm; A = 100% COHB peak ratio at 540 nm and 579 nm; and C = the peak ratio at 540 nm and 579 nm for the blood being analyzed. The following equations were developed to calculate A and B: B = Pavg − (P)[(Pavg − Navg)/(P − N)]; A = B + (Pavg − Navg)/(P − N), Pavg = average peak ratio 540/579 for the positive standard run on the spectrophotometer; P = average decimal concentration measured on the CO-OXIMETER for the positive standard; Navg = average peak ratio 540/579 for the negative standard; N = average decimal concentration measured on the CO-OXIMETER for the negative standard. The new equations provided results consistent with those obtained from a CO-OXIMETER.
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