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HelpTest Code FCUI CU Index
Additional Codes
| Mayo | FCUIX |
| Epic ID | LAB2972 |
Specimen Type
SerumSpecimen Required
Patient Preparation: Patients taking calcineurin inhibitors should stop medication 72 hours prior to draw. Patients taking prednisone should be off their medication for 2 weeks prior to draw.
Specimen Type: Serum
Collection Container/Tube: Red or SST
Submission Container/Tube: Plastic vial
Specimen Volume: 2 mL
Collection Instructions:
1. Draw 5 mL blood in a serum separator tube (SST) (plain, red-top tube is acceptable).
2. Separate from cells within 2 hours of draw. Send 2 mL of serum ambient in a plastic vial.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Ambient (preferred) | 14 days |
| Frozen | 14 days | |
| Refrigerated | 14 days |
Transport at room temperature.
Reject Due To
| Hemolysis: | NA |
| Thawing: | Warm OK; Cold OK |
| Lipemia: | NA |
| Icterus: | NA |
| Other: | NA |
Performing Laboratory
Eurofins ViracorMethod Name
Ex Vivo Challenge, Cell Culture and Histamine Analysis
Day(s) Performed
Monday and Thursday
Report Available
2 to 9 daysReference Values
< 10.0
The CU Index test is the second generation Functional Anti-FceR test. Patient with a CU Index greater than or equal to 10 have basophil reactive factors in their serum which supports an autoimmune basis for disease.
CPT Code Information
86343