Arterial Blood Gas

ABG analysis, acid-base status, and ventilatory adequacy

CRITICAL ABG: Rajan Mehta (ICU-1) — Severe metabolic acidosis. pH 7.22, HCO₃ 11, Lactate 4.2. Notify intensivist immediately.

Rajan Mehta, 75M — ICU-1

UHID: UH-2026-0812 · Collected: 22 Jun 2026 09:15 · Mode: Radial Artery · FiO₂: 0.40 · Temp: 38.2°C

Critical — Metabolic Acidosis

Parameter	Value	Unit	Reference	Flag
pH	7.22		7.35–7.45	Critical
PaCO₂	28	mmHg	35–45	Low
PaO₂	88	mmHg	80–100	Normal
HCO₃⁻ (Actual)	11	mEq/L	22–26	Critical
HCO₃⁻ (Standard)	12	mEq/L	22–26	Critical
Base Excess	-16	mEq/L	-2 to +2	Critical
SpO₂ (Calc)	96.8	%	95–100	Normal
Lactate	4.2	mmol/L	0.5–2.0	Critical
Na⁺	138	mEq/L	136–145	Normal
K⁺	4.1	mEq/L	3.5–5.0	Normal
Cl⁻	112	mEq/L	98–107	High
Glucose	182	mg/dL	70–110	High

Interpretation: High anion gap metabolic acidosis with partial respiratory compensation (compensatory hyperventilation PaCO₂ 28 mmHg). Elevated lactate 4.2 — likely septic shock / hypoperfusion. Anion gap = 138 − (11 + 112) = 15 mEq/L (elevated). Bicarbonate deficit = 13 mEq/L × 0.4 × 70 kg = 364 mEq. Sodium bicarbonate correction considered.