| normal pressure hydrocephalus | <neurology> A brain disorder caused by blockage of the flow of cerebrospinal fluid (CSF), with enlargement of the ventricles of the brain (keep the pressure normal) and compression of brain tissue. Brain atrophy is the result. In this condition the CSF is produced normally but not reabsorbed. Symptom onset is gradual. A key feature is dementia. Treatment is surgical (VP shunt). (13 Nov 1997) |
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| normal range | Normal results can fall outside the normal range. By convention, the normal range is set to cover ninety-five percent (95%) of values from a normal population. Five percent (5%) of normal results therefore fall outside the normal range. (12 Dec 1998) |
| normal serum | A nonimmune serum, usually with reference to a serum obtained prior to immunization. (05 Mar 2000) |
| normal tartrate | Tartrate that contains no uncombined acid groups. (05 Mar 2000) |
| normal toxin | A toxin solution holding exactly 100 lethal doses in 1 ml. (05 Mar 2000) |
| normal values | A set of laboratory test value's used to characterise apparently healthy individuals; now replaced by reference value's. (05 Mar 2000) |