Sample type

Photo import

Add a photo of the ABG report

AI extracts values automatically

Patient context

Age (yrs)

Weight (kg)

pH

PaCO₂ (ref 4.7–6.0 kPa)

kPa

HCO₃⁻ (ref 22–26 mmol/L)

mmol/L

Base excess (ref −2 to +2)

mmol/L

FiO₂ (room air = 0.21)

fraction

Temperature (for correction)

°C

PaO₂ (ref art 10.6–13.3 kPa)

kPa

SaO₂ (ref 94–100%)

%

SpO₂ (pulse oximetry)

%

Respiratory rate

br/min

All optional — leave blank if unavailable

Haemoglobin (Hb)

Haematocrit (Hct)

%

Dyshemoglobinaemias

Methaemoglobin (MetHb) (ref <2%)

%

Carboxyhaemoglobin (COHb) (ref <3%)

%

Oxyhaemoglobin (O₂Hb)

%

Lactate (ref <2 mmol/L)

mmol/L

All optional

Sodium (Na⁺) (135–145)

mmol/L

Potassium (K⁺) (3.5–5.0)

mmol/L

Chloride (Cl⁻) (95–110)

mmol/L

Anion gap (measured, ref 8–12 — leave blank to calculate from Na/Cl/HCO₃⁻)

mmol/L

Ionised Ca²⁺ (1.15–1.35 mmol/L)

mmol/L

Phosphate (0.8–1.5 mmol/L)

mmol/L

Albumin (35–50 g/L)

g/L

All optional

Glucose (4.0–7.0 mmol/L)

Urea (2.5–7.8 mmol/L)

Creatinine (60–120 µmol/L)

Bilirubin (<21 µmol/L)

Osmolality (275–295 mOsm/kg)

mOsm/kg

For ventilator calculations & lung-protective targets

Tidal volume (Vt)

mL

Respiratory rate (set)

br/min

PEEP

cmH₂O

Peak pressure (Ppeak)

cmH₂O

Plateau pressure (Pplat)

cmH₂O

E:I ratio

E:I

Ventilator calculations

Run Interpret with weight and ventilator settings entered to populate this page.

Oxygen delivery & consumption

Enter Hb, SaO₂ and weight, then run Interpret to calculate DO₂, CaO₂ and O₂ extraction ratio.

Serial ABG trends

Each interpretation is logged here automatically with timestamp and trajectory arrows.

No ABGs recorded yet — run an interpretation first.

Stewart / physicochemical approach

Enter Na⁺, Cl⁻, albumin and phosphate values, then run Interpret to see Stewart analysis.

Classic clinical scenarios — quick load

Tap any scenario to auto-populate and interpret. Use as teaching anchors or differential reference.

HAGMA decision tree

High anion gap metabolic acidosis workup

1. Lactate >2 mmol/L?→ Lactic acidosis (type A: hypoperfusion; type B: liver/drugs/seizures)

2. Glucose >11 + ketones?→ DKA (also AKA if glucose normal)

3. Creatinine markedly raised?→ Uraemic acidosis

4. Osmol gap >10?→ Toxic alcohol (methanol, ethylene glycol, propylene glycol)

5. Salicylate levels?→ Salicylate toxicity (often HAGMA + respiratory alkalosis)

6. None of above?→ Pyroglutamic acidosis, D-lactic acidosis, paraldehyde

Normal AG metabolic acidosis (NAGMA)

Urine AG positive (>0)?→ RTA type 1 (distal) or type 4; urease UTI

Urine AG negative (<0)?→ GI losses (diarrhoea, fistula, ileostomy)

Post-large saline infusion?→ Dilutional / hyperchloraemic acidosis

K⁺ high + RTA features?→ RTA type 4 (Addison's, ACEi/ARB, trimethoprim)

Blood Gas Interpreter — ABG, VBG and CBG Analysis with Teaching Notes