Porphyria cutanea tarda

Familial PCT; PCT; UROD deficiency; Uroporphyrinogen decarboxylase deficiency

Porphyria cutanea tarda is the most common type of porphyria. The disorder results from low levels of the enzyme responsible for the fifth step in heme production. Heme is a vital molecule for all of the body's organs. It is a component of hemoglobin, the molecule that carries oxygen in the blood. Porphyria cutanea tarda is a subtype of porphyria. When signs and symptoms occur, they usually begin in adulthood and result from the skin becoming overly sensitive to sunlight. Areas of skin expo ...