Question

A 40-year-old woman with a blistering rash on sun-exposed areas, fragile skin, and some hypertrichosis is suspected of having porphyria cutanea tarda (PCT). Which test is most useful for confirming the diagnosis?

Accepted Answer

24-hour urine porphyrins

Answer

Skin biopsy

Answer

Plasma porphyrin levels

Answer

ANA test

Answer

Wood's lamp examination

Practice question

A 40-year-old woman with a blistering rash on sun-exposed areas, fragile skin, and some hypertrichosis is suspected of having porphyria cutanea tarda (PCT). Which test is most useful for confirming the diagnosis?