Figure 1From: Diagnostic pitfalls of hyperprolactinemia: the importance of sequential pituitary imagingFrequency distribution according to serum prolactin concentration in patients with non-functioning pituitary adenoma. Serum prolactin concentration in most patients was around 10 to 20 ng/ml. Nine (4.2%) patients presented the serum prolactin concentration higher than 90 ng/ml (the dark bar graph).Back to article page