Unstained Specimen

A specimen that is mounted for microscopic study but without preparation methods which use dyes, reagents or other materials to produce coloration in tissues or microorganisms for microscopic examination. (NCI Thesaurus)

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Unstable Medical Device Problem

Issue associated with the connection of device and/or device components not possessing stability, or is unbounded.

Unstable Capture Threshold Medical Device Problem

Issue with the amount of output energy needed to cause cardiac depolarization being unstable.

Unstable Angina

Angina pectoris (or equivalent type of ischemic discomfort) which has recently changed in frequency, duration, intensity, or occurs at rest.

Unspecified Type Delusional Disorder

A subtype of delusional disorder applied when the dominant delusional theme cannot be clearly determined.

Unspecified State of Consciousness

The state of consciousness is not controlled. The possibility exists for having multiple conscious states over a period of time.

Unspecified Anatomic Sites

Research that isn't focused on a specific site.