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HelpTest Code EFPO Electrolyte and Osmolality Panel, Feces
Reporting Name
Electrolyte and Osmolality Panel, FUseful 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 | Yes | Yes |
| OSMOF | Osmolality, F | Yes | Yes |
| MG_F | Magnesium, F | Yes | Yes |
| OG_F | Osmotic Gap, F | No | Yes |
| POU_F | Phosphorus, F | Yes | 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
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
FecalOrdering Guidance
This test is only clinically valid if performed on watery specimens. In the event a formed fecal specimen is submitted, the test will not be performed.
Specimen Required
Patient Preparation: No barium, laxatives, or enemas may be used for 96 hours prior to start of, or during, collection.
Supplies: Stool containers-24, 48, 72 Hour Kit (T291) Note: A random collection is required, but may be submitted in containers provided for timed collection.
Container/Tube: Stool container
Specimen Volume: 10 g
Collection Instructions:
1. Collect a very liquid, random stool specimen.
2. Do not add preservative to the specimen. If a preservative is added, testing will be canceled.
Specimen Minimum Volume
5 g
Reject Due To
| Preservatives added | Reject |
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Fecal | Frozen (preferred) | 14 days | |
| Refrigerated | 7 days | ||
| Ambient | 48 hours |
Reference Values
An interpretive report will be provided
Day(s) Performed
Monday, Thursday
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 |
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 US Food and Drug Administration.Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.