Direct Immunofluorescence, Tissue Biopsy (Cutaneous, Mucosal, Epithelial)

Casandra

Casandra Test Code AR72469Version 1 (DRAFT)

Performing Lab

Lab ARUP LaboratoriesLab Test ID 0092572CPT Codes 88346, 88350

Direct Immunofluorescence, Tissue Biopsy (Cutaneous, Mucosal, Epithelial)

Also known as: CUTDIF

Clinical Use

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Use

This test is used for the assessment of pruritic, urticarial, blistering, and/or erosive inflammatory conditions, including immune-mediated cutaneous diseases. Direct Immunofluorescence is particularly useful in diagnosing immunobullous diseases, epithelial antibody-associated disorders, and other inflammatory skin conditions by detecting specific immunoglobulin deposits in biopsy specimens.

Special Instructions

Optimal specimen location and type, along with complementary serum testing and histopathological examination, are crucial for accurate diagnosis. Ensure that tissues are transported in the appropriate medium (Michel's medium or Zeus tissue fixative) and labeled properly if not using ARUP-supplied vials. Avoid formalin-fixed or frozen tissue in Michel's medium, as these conditions are unacceptable.

Limitations

Direct Immunofluorescence may not distinguish between certain pemphigoid variants or differentiate specific immunological markers in isolation; additional serum testing or alternative fixation methods may be required for comprehensive analysis. The fluorescence fades over time, limiting long-term specimen visualization. Negative control sections and technical adequacy checks are essential for ensuring valid results.

Test Details

New York Approved