Canonical Question

IV Fluids

V5 F2.i Historical V4 I2.i 1 appearance

Master answer

Definitions

Osmolality is a measure of solute concentration as defined as the number of osmotically active particles per kilogram water.

Tonicity is the effective osmolality and is equal to the sum of the concentrations of the solutes which have the capacity to exert an osmotic force across the membrane.

Pharmacology

CICMWrecks Table – NS | 5% Dex (Click to Open)

Exam appearances

ExamExact wordingRelationshipSuccess
2018A Q17 Define the osmolality and tonicity of an intravenous fluid (20% of marks). Compare and contrast the pharmacology of intravenous Normal Saline 0.9% and 5% Dextrose (80% of marks). historical_member —