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HelpTest Code EFPO Electrolyte and Osmolality Panel, Feces
Specimen Required
Collection Container/Tube: Stool container (T291)
Specimen Volume: 10 g
Collection Instructions: Collect a very liquid stool specimen.
Additional Information:
1. Do not send formed stool. In the event a formed stool is submitted, the test will not be performed. The report will indicate "A formed stool specimen was submitted for analysis. This test was not performed because it only has clinical value if performed on a watery stool specimen."
2. Osmolality results will be reported as mOsm/kg regardless of collection duration.
3. Sodium, chloride, and potassium will be reported as mmol/L
4. Magnesium and phosphorus will be reported as mg/dL
Useful For
Workup of cases of chronic diarrhea
Diagnosis of factitious diarrhea (where patient adds water to stool to simulate diarrhea)
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| NA_F | Sodium, F | No | Yes |
| K_F | Potassium, F | No | Yes |
| CL_F | Chloride, F | No | Yes |
| OSMOF | Osmolality, F | No | Yes |
| MG_F | Magnesium, F | No | Yes |
| OG_F | Osmotic Gap, F | No | Yes |
| POU_F | Phosphorus, F | No | Yes |
Method Name
OG_F: Calculation
NA_F, K_F, CL_F: Indirect Ion-Selective Electrode (ISE) Potentiometry
OSMOF: Freezing Point Depression
POU_F: Photometric, Ammonium Molybdate
MG_F: Colorimetric Titration
Reporting Name
Electrolyte and Osmolality Panel, FSpecimen Type
FecalSpecimen Minimum Volume
5 g
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Fecal | Frozen (preferred) | 14 days |
| Refrigerated | 7 days | |
| Ambient | 48 hours |
Reference Values
No established reference values
Day(s) and Time(s) Performed
Monday, Wednesday, Friday; Evening
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
82438-Chloride
83735-Magnesium
84302-Sodium
84100-Phosphorus
84999 x 2-Osmolality, Potassium
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| EFPO | Electrolyte and Osmolality Panel, F | 88697-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| NA_F | Sodium, F | 15207-4 |
| K_F | Potassium, F | 15202-5 |
| CL_F | Chloride, F | 15158-9 |
| MG_F | Magnesium, F | 29911-5 |
| OG_F | Osmotic Gap, F | 73571-2 |
| POU_F | Phosphorus, F | 88713-3 |
| OSMOF | Osmolality, F | 2693-0 |