-  Patient should fast for 8 h.

-  Inject the tracer either by lumbar or cisterna magna subarachnoid puncture.

-  For CSF leak add nasal or othic cotton pledgets.

-  In following hours patient should keep in bed.

1  Thom AF et al. Medicina Nuclear en la Hidrocefalia del Adulto, p: 491-497 in: Medicina Nuclear Aplicaciones Clínicas. Eds: I. Carrio - P. González. Editorial Masson, Barcelona España, 2003.