NCARC has a growing collection of blood and cerebrospinal fluid samples in patients with idiopathic normal pressure hydrocephalus (iNPH). There is an associated research database with clinical, neuropsychological and imaging data. iNPH lacks a good understanding of the cause of the condition. The iNPH collection aims to promote research into the discovery of new biomarkers by providing biomaterial to academic and commercial researchers/partners, to enable investigation into the underlying cause of the condition using the most advanced scientific methods thereby improving diagnosis and treatment.