Cerebrospinal fluid opening pressure in clinical practice - a prospective study.

Using two standard deviations, we provide suggestions for CSFOP limits with respect to gender, age and BMI. Our results suggest that CSFOP cut-offs for pathological intracranial hypertension should be raised with these factors taken into consideration. As a "rule-of-thumb" we suggest the following cut-offs: for males < 30 cm H2O (< 25 if over age 70), and for females < 25 cm H2O (27.5 if over 30 BMI). A diagnosis of intracranial hypertension should not be given without such considerations.