Chronic Urticaria (CU) Index Panel

Abbrev Code:XMISC   
Order Code:LAB4909Order Name:Laboratory Miscellaneous Order
Methodology:Ex Vivo Challenge, cell culture and histamine analysis
CPT Codes: 84443 x1, 86352 x1, 86376 x1, 86800 x1
Test Includes:Anti-Thyroid Peroxidase IgG, Anti-Thyroglobulin IgG, TSH and CU Index
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 4-12 days.

This test has not been cleared or approved by the US Food and Drug Administration.

Collection Instructions

Optimal Volume:6 mL
Minimum\Peds Volume:2.2 mL
Container:Red (no gel)
Patient Preparation:Patients taking calcineurin inhibitors should stop medication 72 hours prior to draw. Patients taking prednisone should be off their medication 2 weeks prior to draw.
Causes for Rejection:Collected in gel. Thawed specimens.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 3 mL serum, 1 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature (preferred).
Stability:5 days at room temperature; 7 days refrigerated or frozen.
Test Performed at or Referral Lab Lab Sendouts  (ViraCor via Mayo)
Referral Lab number:FCUIP


Reference Range:
Anti-Thyroid Peroxidase IgG Less than 35 IU/mL
Anti-Thyroglobulin IgG Less than 40 IU/mL
TSH (Thyrotropin) 0.4-4.0 uIU/mL
CU Index Less than 10.0



Use:The CU index test is the second generation Functional Anti-FceR test. Patients with a CU index greater than or equal to 10 have basophil reactive factors in their serum which supports an autoimmune basis for disease.

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