What're the tests for idiopathic intracranial hypertension?

Spinal tap: The most direct test is to measure pressure in the spinal fluid. This is done with a spinal tap and pressure measuring column. The fluid column is measured, and then the fluid is drained off. Just draining the fluid can relieve symptoms. Analysis of the fluid would rule out more serious conditions. This procedure is easily performed in a doctor's office or emergency room.

CT, MRI, LP: Imaging studies like cts or mris are useful to start with to make certain that there isn't actually a lesion(ie. Tumor) that is causing the intracranial pressure. Also the cerebral ventricles can be visualized to ensure there isn't frank hydrocephalus. A physical examination with fundoscopy can reveal transmitted pressure to the optic discs. Finally, an LP can measure the spinal pressure.