A Fagan nomogram can be used to chart the chance that a patient with a negative X-ray has a fracture. Using a likelihood ratio of 0.075 (center line), the 10 percent pretest probability (left line) of Patient A (blue line) indicates a less than 1 percent post-test probability (right line). The 90 percent pretest probability (left line) of Patient B (red line) indicates a 40 percent post-test probability (right line).
A Fagan nomogram can be used to chart the chance that a patient with a negative X-ray has a fracture. Using a likelihood ratio of 0.075 (center line), the 10 percent pretest probability (left line) of Patient A (blue line) indicates a less than 1 percent post-test probability (right line). The 90 percent pretest probability (left line) of Patient B (red line) indicates a 40 percent post-test probability (right line).
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