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HelpTest ID FCUIX CU Index
Method Name
Ex Vivo Challenge, Cell Culture and Histamine Analysis
Reporting Name
CU IndexSpecimen Type
SerumDraw 3 - 5 mL blood in a serum separator tube (SST) (plain, red-top tube is acceptable). Separate from cells within 2 hours of draw. Send 2 mL of serum refrigerated in a plastic vial.
Note: 1) Patients taking calcineurin inhibitors should stop medication 72 hours prior to draw.
2) Patients taking prednisone should be off their medication for 2 weeks prior to draw.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 7 days |
| Ambient | 7 days | |
| Frozen | ||
Reference 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.
Day(s) Performed
Monday, Wednesday, Friday
Report Available
2 - 3 daysPerforming Laboratory
Viracor-IBT LaboratoriesTest Classification
This test was developed and its performance characteristics determined by Viracor-IBT Laboratories. It has not been cleared or approved by the FDA.CPT Code Information
86352