Anion Gap + Osmolality + Osmolar Gap
Calculator with US (conventional) and SI (European) units. Units are shown beside each input.
Inputs
Electrolytes
mEq/L
mEq/L
mEq/L
g/dL
Osmolality
mg/dL
mg/dL
mg/dL
mOsm/kg
AG = Na − (Cl + HCO₃)
US osmolality uses: 2×Na + glucose/18 + BUN/2.8 (+ ethanol/3.7)
SI osmolality uses: 2×Na + glucose + urea (+ ethanol)
US osmolality uses: 2×Na + glucose/18 + BUN/2.8 (+ ethanol/3.7)
SI osmolality uses: 2×Na + glucose + urea (+ ethanol)
Results
Anion Gap
—
mEq/L
Need Na, Cl, HCO₃
Corrected Anion Gap
—
mEq/L
Albumin optional
Calculated Osmolality
—
mOsm/kg
Need Na, glucose, BUN/urea
Osmolar Gap
—
mOsm/kg
Need measured osmolality
created by Nick Mark @nickmmark
Use this tool to calculate anion gap and osmolar gap.
The source code is available open source here.