Fluids & Lytes

Question 1

Osmolar Gap

1) Equation
2) Interpretation

Answer 1

1) = Measured Osm - Calculated Osm

2) If Gap > or = 10 mOsm / kg H2O, then it suggests Exogenous osmoles.

Question 2

Anion Gap

1) Equation
2) Normal value

Answer 2

1) = Na - Cl - HCO3

2) 12 (+/- 2) mEq/L

Question 3

Calculated Osmolality

1) Eq
2) Normal value

Answer 3

1) = 2Na + BUN (urea) + Glucse

2) 280-300 mOsm/kg H20