Table 2.

Test characteristics of ESR, CRP and a combination of the two for positive temporal artery biopsy

	Sensitivity	Specificity	PPV	NPV
ESR	84.2%	29.5%	26.4%	86.1%
	149/177	173/592	149/563	173/201
CRP	86.4%	30.5%	27.2%	88.6%
	153/177	179/587	153/561	179/202
ESR and CRP*	80.8%	41.2%	29.3%	87.7%
	143/177	242/587	143/488	242/276

^*evaluating subjects with both tests elevated

ESR=erythrocyte sedimentation rate; CRP=C-reactive protein; PPV=positive predictive value; NPV=negative predictive value