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HelpTest Code NITF Nitrogen, Total, Feces
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
FecalShipping Instructions
Send entire stool collection (must contain at least 5 g of feces) frozen on dry ice in Mayo Clinic Laboratories-approved container.
Necessary Information
Length of collection period is required.
Specimen Required
Patient Preparation: Laxatives and enemas should not be used during collection as barium and boric acid interfere with test procedure.
Supplies: Stool Containers - 24, 48, 72 Hour Kit (T291)
Container/Tube: Stool container; complies with shipping requirements, do not use other containers.
Specimen Volume: Entire collection (24, 48, 72, or 96 hours)
Collection Instructions:
1. All containers must be sent together.
2. Entire collection must contain at least 5 g of feces.
3. The number of containers sent should be indicated on the labels (ie, 1 of 4)
Specimen Stability Information: Frozen 3 years
Additional Information: Patient can store sample at refrigerate temperature during collection period.
Specimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Fecal | Frozen (preferred) | ||
| Ambient | 7 days | ||
| Refrigerated | 7 days | ||
Reference Values
<16 years: Not established
≥16 years: 1-2 g/24 hours
CPT Code Information
84999
Specimen Retention Time
7 daysReject Due To
| Urine and stool mixed | Reject |
Day(s) Performed
Friday