FECAL ELECTROLYTES

What this test checks

Measures sodium and potassium in stool to help classify chronic diarrhea (osmotic vs secretory).

Why do people get this test?

Used in chronic diarrhea investigations to guide treatment.

When you should consider this test

• Diarrhea lasting more than 4 weeks
• Unexplained chronic loose stools
• Specialist requested

How to prepare

Stool sample — collection instructions provided.