| NRS | neurobehavioral rating scale; normal rabbit serum; normal reference serum; numerical rating scale |
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| NRSCC | National Reference System in Clinical Chemistry |
| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
| OSI | open systems interconnection [reference model] |
| PDR | pediatric radiology; peripheral diabetic retinopathy; Physicians' Desk Reference; postdelivery room;... |
| reference values | The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality. (12 Dec 1998) |
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| physicians' desk reference | This thick volume the 1998 pdr runs 3,223 pages in length is a guide to all the prescription drugs available in the united states. Although not exactly redcommended fare for bedtime reading, the pdr is a key reference to the american pharmacopeia. It is available in many bookstores in the u.s. (12 Dec 1998) |
| planes of reference | Plane's which act as a guide to the location of other plane's. (05 Mar 2000) |
| hexaxial reference system | The figure resulting if the lines of derivation of the unipolar limb leads of the electrocardiogram are added to the triaxial reference system. (05 Mar 2000) |
| delusion of reference | A delusional idea that external events, etc., refer to the self. (05 Mar 2000) |
| triaxial reference system | The figure resulting from rearranging the lines of derivation of the three standard limb leads of the electrocardiogram (as represented in Einthoven's triangle) so that, instead of forming the sides of an equilateral triangle, they bisect one another. Synonym: Dieuaide diagram. (05 Mar 2000) |