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Follow‐up program for blood donors with unconfirmed screening results reveals a high false‐positive rate in Dalian, China

Abstract : Background: Chinese blood donors with unconfirmed serological and/or molecular screening results are deferred permanently. This study investigated the implementation and performance of a follow-up program aiming to improve the notification and management of deferred donors in Dalian, China. Study design and methods: From January 2013 to February 2018, 411,216 donations were tested for HBsAg, anti-HCV, anti-HIV/HIV antigen, and antibodies to Treponema pallidum. HBV, HCV, and HIV nucleic acid testing (NAT) was performed in mini-pools of six or in individual donations (IDs). Reactive donations were evaluated further with alternative serological assays and ID-NAT re-testing. A follow-up procedure was developed to evaluate a subset of deferred donors that were either potential NAT yield cases, serology non-reactive and NAT non-repeated reactive (NRR), or serology NRR irrespective of NAT result. Results: Serological and molecular routine, plus supplemental testing, identified HBV, HCV, HIV, and TP in 503 (0.12%), 392 (0.09%), 156 (0.04%), and 2041 (0.49%) donations, respectively. Overall, 683 of 4156 (16.4%) eligible donors and 205 donors deferred prior 2013 participated in the program. They included 664 serology NRR and 224 NAT yield cases, and 58.8% repeat donors. All markers combined, follow-up documented false reactivity, primary acute infections, and OBI in 61.9% (550/888), 3.3% (29/888), and 12.8% (114/888) of these donors, respectively. Isolated anti-HBc or anti-HBs reactivity was observed in 22% of cases. Conclusion: Follow-up testing refined infection status in 78.0% (693/888) of deferred donors with unconfirmed screening results. This high false-positive rate encouraged to reevaluate the current screening strategies and to consider donor reentry.
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Submitted on : Wednesday, May 26, 2021 - 5:29:53 PM
Last modification on : Saturday, May 29, 2021 - 3:02:23 AM




Xuelian Deng, Liang Zang, Xinmei Wang, Hui Chen, Jiangdi Liu, et al.. Follow‐up program for blood donors with unconfirmed screening results reveals a high false‐positive rate in Dalian, China. Transfusion, Wiley, 2020, 60 (2), pp.334-342. ⟨10.1111/trf.15656⟩. ⟨inserm-03237661⟩



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