Methodology
Ion Selective Electrode (ISE)
Specimen Type
Stool
Performing Lab
Quest Diagnostics Chantilly
Epic ID
Other Reference Test
Lab Test Days
Sunday-Friday
Standard TAT
3-5 Days
Collection Information
Specimen Required
2-10 mL random watery liquid fecal
Container Type
Sterile Container
Collection Instructions
24-hour, 48-hour or 72-hour watery liquid fecal collected in a sterile container also acceptable. Keep refrigerated during collection
Processing Information - Lab Use Only
Transport Temperature
Frozen-Only
Specimen Stability
Room Temp: Unacceptable; Refrigerated: 7 Days; Frozen: 60 Days (preferred)
Rejection Criteria
Specimens in paint cans, Formed stool, Specimens received refrigerated
Test Volume Required
10 ml random watery liquid fecal
Minimum Test Volume
2 ml random watery liquid fecal
Processing Instructions
Submit a frozen specimen of watery liquid feces in a plastic screw-cap container. Keep feces refrigerated during collection and transport frozen.
Included Tests
Sodium, Feces; Potassium, Feces; Chloride, Feces
Comments
Only watery liquid feces are an acceptable specimen. In the event a formed fecal specimen is submitted, the test will not be performed and will be cancelled. Stable up to 3 freeze-thaw cycles
CPT Codes
82438, 84302, 84999
Revised
9/10/26
Initials
IM