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HelpTest Code LAB3417 Electrolyte and Osmolality Panel, Feces
Additional Codes
Mayo test code: EFPO
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 |
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
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
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 |
Reject Due To
| Preservatives added | Reject |
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
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.
Day(s) Performed
Monday, Thursday