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

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

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 pH < 7.35 and pCO₂ > 6
² pH < 7.35 and BE < -3
³ pH < 7.35, pCO₂ > 6 and BE < -3
⁴ pH < 7.35, pCO₂ < 6 and BE > -3
⁵ 7.35 ≤ pH ≤ 7.45, 4 ≤ pCO₂ ≤ 6 and -3 ≤ BE ≤ 3
⁶ 7.35 ≤ pH ≤ 7.45, (pCO₂ < 4 or > 6) or (BE < -3 or > 3)
⁷ pH > 7.45 and pCO₂ < 4
⁸ pH > 7.45 and BE > 3
⁹ pH > 7.45, pCO₂ < 4 and BE > 3
¹⁰ pH > 7.45, pCO₂ > 4 and BE < 3
BE: Base Excess. Units for pCO₂ are kPa
Within the pH group < 7.35 and > 7.45 the sum exceeds 100% due to patients represented in more than one group
The table illustrates complete cases. VBG results were missing for 3605 patients (57%)

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