FCUIX - Clinical: CU Index

Test Catalog

Test Name

Test ID: FCUIX    
CU Index

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Patients with a chronic form of urticaria who are positive (>10) with the CU index have an autoimmune basis for their disease.  A positive result does not indicate which autoantibody (anti-IgE, anti-FceRI or anti-FCERII) is present.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

< 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.