Fig. 1From: Late-onset symptomatic hyperprolactinemia in 6-pyruvoyl-tetrahydropterin synthase deficiencyProlactin levels of the 12 patients with PTPS deficiency. Patients 1, 2, 5, 9, and 10 had significant or symptomatic elevation of prolactin. Normal reference values of prolactin: male < 11 ng/mL, female < 17 ng/mLBack to article page