| OPM | occult primary malignancy; Office of Personnel Management; ophthalmoplegic migraine |
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| UAP | unlicensed assistive personnel; unstable angina pectoris; urinary acid phosphatase; urinary alkaline... |
| insurance selection bias | Adverse of favourable selection bias exhibited by insurers or enrollees resulting in disproportionate enrollment of certain groups of people. (12 Dec 1998) |
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| k selection | <zoology> In evolution, the selection of traits that aid an organisms competitive capability when the population is at or near its carrying capacity. (21 Mar 1998) |