Diagnostic tests for cancer as cause of low back pain

	Sensitivity	Specificity
Erythrocyte sedimentation rate
≥20 mm/hour	0.78	0.67
≥50 mm/hour	0.56	0.97
≥100 mm/hour	0.22	0.996
Anemia (hematocrit <40 percent for men or <38 percent for women)	0.54	0.86
Hematocrit <30	0.09	0.994
White blood cell count ≥12,000	0.22	0.94

WBC: White blood cell count.

Data from: Deyo, RA, Diehl, AK. Cancer as a cause of back pain: frequency, clinical presentation, and diagnostic strategies. J Gen Int Med 1988; 3:230.

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Diagnostic tests for cancer as cause of low back pain