Assertion: elisa's specificity | /r/HasProperty | determined using 198 hbsag
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text: Specificity, sensitivity, positive predictive value and negative predictitive value of the designed ELISA assay were determined using three collections of human sera including 198 HBsAg positive, 250 HBsAg negative and 100 unselected samples collected from the Iranian Blood Transfusion Organization and referral medical labs, respectively.