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  Wintersí Formula for Metabolic Acidosis Compensation  
HABG calculated
bicarbonate (HCO3-)
(mmol/L or mEq/L)
   
Expected pCO2 Compensation (mmHg)
 

Calculation(s) used

Winter's formula:

Expected pCO2 = 1.5 * HCO3- + 8 +/- 2

Notes

Winter's formula is used to calculate the patients expected pCO2 value. This is then compared with the patients actual (measured) pCO2...

  • If the measured pCO2 is higher than calculated this indicates Primary Respiratory acidosis.

  • If measured pCO2 is lower than calculated this indicates Primary Respiratory acidosis.

  • If the values are similar then Respiratory compensation is deemed adequate.


References
1. Acid-Base Disorders: Acid-Base Regulation and Disorders: Merck Manual Professional
[Online] http://www.merckmanuals.com/professional/sec12/ch157/ch157b.html

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