What Is The CIU?
Clinical Investigation Unit is no longer an inpatient unit; instead, it deals
entirely with outpatient tests such as pituitary stimulation tests, described in
the section entitled Outpatient Endocrine Tests.
Thyroid cancer patients requiring radioiodine ablation are still admitted to hospital but the original CIU - which provided inpatient management of diabetes and other endocrine problems - no longer exists.