Three days of vomiting, one blood gas

core

The 45-year-old with gastric outlet obstruction from the lab module.

Blood gas

pH7.50

PaCO247 mmHg

HCO336 mmol/L

PaO284 mmHg

Na136 mmol/L

Cl86 mmol/L

K2.9 mmol/L

No high/low cues on purpose: read the numbers the way the gas machine prints them.

Stepwise interpretation

Commit to your own read first: pH, primary process, compensation, gap, delta, oxygenation. Then walk the engine’s steps and see where you agree.