Serum PTH level
CBC, CMP, phosphate, coags
Inpatient - hepatitis panel, cryofibrinogen level, lipase, ESR, CRP, ANA, ANCA
Plain radiographs - arborization of vascular calcification within dermis and subQ tissues
Ultrasound may aid in examining for vascular calcification
Definitive means of diagnosis
Punch biopsy from lesion margin by dermatologist or wound surgeon
Caution in non-ulcerated/necrotic lesions as biopsy site has high likelihood of not healing in true<unk>
Calciphylaxis
Brown recluse spider bite
Purpura fulminans
Bullous pemphigoid
Drug rash
Cellulitis, necrotizing fasciitis
Malaria
Erythema nodosum