amnio,
amniocentesis (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of fetal abnormalities
celiocentesis removal of fluid from the abdomen by centesis
lumbar puncture,
spinal puncture,
spinal tap removal by centesis of fluid from the subarachnoid space of the lumbar region of the spinal cord for diagnostic or therapeutic purposes