Ex-Vivo Challenge and cell culture.
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.
2 - 3 days
- IBT Chronic Urticaria Index
Patients taking calcineurin inhibitors should stop their medication for 72 hours prior to draw. Patients taking prednisone should be off their medication for 2 weeks prior to draw. Collect specimen in an SST or red top tube. Centrifuge and aliquot serum into a plastic vial within 2 hours of collection. Store at room temperature up to 1 week or freeze for longer storage.
Test sent to Viracor Eurofins.