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Osmolality, fecal-994

Test info

Test name:

Osmolality, fecal

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Alternate names:

Fecal Osmolality

Useful for:

Distinction of osmotic from nonosmotic secretory diarrhea. A large deficit (>50 mOsm/kg) in the calculated osmolality (twice the sum of the stool sodium and stool potassium) from the measured stool osmolality indicates osmotic diarrhea.

Specimen

Specimen type:

Stool, liquid

Collection container:

Screw cap plastic container (sterile)

Volume:

15 mL

Collection instructions:

Stool sample must be collected without addition of water

Processing instructions:

Freeze

Transport container:

Screw cap plastic container (sterile)

Transport and stability:

Frozen (strict)

Ambient - NO

Refrigerated - NO

Reason for rejection:

Stool not liquid
Stool contaminated with urine
Paint can submitted
Non-frozen stool

Performance

Performing lab:

LabCorp Burlington (120071): R-NX

Days set up:

Mo - Sa

TAT:

5 days

Method:

Freezing point depression

Clinical and Interpretive info

Reference ranges:

Not established

Billing

CPT codes:

84999

LOINC code:

Result 2693-0

Tracking

Date created:

05/24/2019

Revised date:

04/11/2022

Review date:

03/31/2022