In a screening study in 509 patients with TBI or subarachnoid hemorrhage (SAH), set to determine the prevalence of post-traumatic hypopituitarism, PRL was measured in 93% and low PRL (defined as PRL < 2.8 ng/ml in females and < 2.1 ng/ml in males) was observed in 1 case, resulting in a 0.2% rate [85]. The gene discussed is PRL; the disease is hypopituitarism.