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Table 3 Acid-base status evaluated with a venous blood sample at admission

From: The formation and design of the 'Acute Admission Database'- a database including a prospective, observational cohort of 6279 patients triaged in the emergency department in a larger Danish hospital

pH N (%) Acid-base status N (%)
< 7.35 405 (15) Respiratory acidosis1 311 (77)
   Metabolic acidosis2 100 (25)
   Mixed respiratory/metabolic acidosis3 10 (2.5)
   Acidosis other4 16 (4)
7.35-7.45 2069 (77) Normal acid-base status5 976 (47)
   Compensated6 1093 (53)
> 7.45 200 (8) Respiratory alkalosis7 44 (22)
   Metabolic alkalosis8 83 (42)
   Mixed respiratory/metabolic alkalosis9 1 (0.5)
   Alkalosis other10 73 (37)
  1. 1 pH < 7.35 and pCO2 > 6
  2. 2 pH < 7.35 and BE < -3
  3. 3 pH < 7.35, pCO2 > 6 and BE < -3
  4. 4 pH < 7.35, pCO2 < 6 and BE > -3
  5. 5 7.35 ≤ pH ≤ 7.45, 4 ≤ pCO2 6 and -3 ≤ BE ≤ 3
  6. 6 7.35 ≤ pH ≤ 7.45, (pCO2 < 4 or > 6) or (BE < -3 or > 3)
  7. 7 pH > 7.45 and pCO2 < 4
  8. 8 pH > 7.45 and BE > 3
  9. 9 pH > 7.45, pCO2 < 4 and BE > 3
  10. 10 pH > 7.45, pCO2 > 4 and BE < 3
  11. BE: Base Excess. Units for pCO2 are kPa
  12. Within the pH group < 7.35 and > 7.45 the sum exceeds 100% due to patients represented in more than one group
  13. The table illustrates complete cases. VBG results were missing for 3605 patients (57%)