Journal of Laboratory Medicine and Quality Assurance

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Table. 3.

Table. 3.

Positive rates of qualitative rheumatoid factor reagents used in this study

VariableLotCut-off (IU/mL)/time (min)Level 1Level 2Level 3Level 4Level 5Level 6Level 7Level 8Level 9Level 10
First experiment
 ManufacturerRandoxRandoxRandoxRandoxBio-radRandoxBio-radRandoxRandoxBio-rad
 Measured value by Modular E170 (IU/mL)11.418.228.033.033.648.859.977.890.893.8
 Target value (range), IU/mL12.623.128.5 (22.8–34.2)40.532.7 (28.0–37.4)60.859.5 (52.9–66.1)82.1 (65.7–98.5)109.995.5 (86.5–105)
 LabSlide RF651803110/20%0%25%87.5%100%100%100%12.5%100%100%
 ASAN RA LatexS99320/10%37.5%50%100%100%100%100%50%100%100%
 RaPET RF65700520/30%0%62.5%87.5%100%100%100%100%100%100%
 RaPET RF65800520/30%0%100%100%100%87.5%100%100%100%100%
 RF Latex Test18051220/20%50%100%100%100%100%100%100%100%100%
 RF-100753488/20%25%100%100%100%100%100%100%100%100%
Second experiment
 ManufacturerPooled serumPooled serumPooled serumBio-radPooled serumPooled serum----
 Measured value by Modular E170 (IU/mL)7.9013.2522.9523.1027.80199.10----
 LabSlide RF651808110/20%0%100%100%100%100%----
 ASAN RA LatexH99520/10%0%0%0%100%100%----
 RaPET RF65800420/30%0%100%100%100%100%----
 RF Latex Test18163120/20%0%100%100%100%100%----
 RF-100770018/20%0%100%80%100%100%----
J Lab Med Qual Assur 2019;41:105-10 https://doi.org/10.15263/jlmqa.2019.41.2.105
© 2019 J Lab Med Qual Assur