From: Chapter 5, Use of the Laboratory
Copyright © 1990, Butterworth Publishers, a division of Reed Publishing.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition. Boston: Butterworths; 1990.
Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition.
Show detailsTable 5.6Rules for Repeating Laboratory Tests
| Test Results | ||||
|---|---|---|---|---|
| Rule | Initial | Repeat | Action | |
| Believe the positive | + | + | } | |
| + | − | Further diagnostic or therapeutic action | ||
| − | + | |||
| − | − | No further action | ||
| Believe the negative | + | + | Further diagnostic or therapeutic action | |
| + | − | } | ||
| − | + | No further action | ||
| − | − | |||
Source: Adapted from Politser, 1982.
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