Gastroenterology · Internal Medicine

Stool Osmotic Gap calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Measured stool osmolality

mOsm/kg

Allowed range: 50–600 mOsm/kg

Stool sodium

mmol/L

Allowed range: 0–200 mmol/L

Stool potassium

mmol/L

Allowed range: 0–200 mmol/L

Result

3 fields remaining

Anyone can run this calculator. Sign in to save, favourite, or send the result.

Ruqelo is AI and can make mistakes. Check important information.

Clinical inputs

Measured stool osmolality (mOsm/kg)Accepted range: 50 to 600
Stool sodium (mEq/L)Accepted range: 0 to 200
Stool potassium (mEq/L)Accepted range: 0 to 200

Primary source

Clinical stool osmotic gap identity used with measured stool osmolality: gap = measured stool osmolarity - 2*(stool Na + stool K). Related osmolality methods literature PMID 1112025 (Dorwart). Scope: osmotic gap >50 mOsm/kg suggests osmotic diarrhea; <50 suggests secretory. (1975)

View source