Bullous Disease of Dialysis Workup
- Author: Maureen B Poh-Fitzpatrick, MD; Chief Editor: William D James, MD more...
Laboratory Studies
To exclude a true porphyria, a plasma or serum porphyrin assay is recommended. The test result will be grossly abnormal in the case of any porphyria in an individual with compromised renal function. Fecal porphyrin analyses may also reveal increased porphyrin excretion in dialyzed patients with true porphyria.[12]
Histologic Findings
Light microscopic examination of a biopsy of a blister reveals a subepidermal bulla indistinguishable from that of a true porphyria, with edematous dermal papillae and a scant perivascular lymphocytic infiltrate.[1]
Ultrastructural studies show thickening of the dermal venular walls and dermoepidermal junction due to replicated basal laminae, hypogranulated mast cells, and granulofilamentous hyaline masses in the dermal connective tissue that appear to be secreted by adjacent fibroblasts.[13]
Direct immunofluorescence examinations have revealed the presence of immunoglobulin G and, inconsistently, of immunoglobulin A, immunoglobulin M, fibrin, and complement around the dermal venules, with immunoglobulin G and complement sporadically noted at the dermoepidermal junction or bulla floor.[1, 6, 14]
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