BACKGROUND: Some properties of blood are modified post mortem. These modifications might give false-negative or false-positive results in infectious disease testing. Most CE-marked test equipment for infectious serology testing is not validated for testing post-mortal blood. Validation, however, is obligatory, if the results are used for the release of tissues for transplantation. MATHODS: Samples of pre- and post-mortem sera were obtained from 20 cornea donors, and the results were compared for anti-HIV-1/2, anti-HCV, HBsAg, and anti-HBc on the Siemens-BEP-III Automatic System. Negative post-mortem sera were spiked with standard sera (PEI anti-HCV IgG, PEI HBsAg ad 1000 standard, anti-HBc IgG (WHO) NIBSC 95/522, PEI anti-HIV-IV) in concentrations which give low- and high-positive results for the respective marker. RESULTS: All pre-mortem sera were negative for all markers. None of the post-mortem samples was false-positive. None of the spiked postmortem samples was false-negative. Technical errors occurred during the validation process but could be detected and eliminated. Serum samples should be centrifuged immediately after collection, and it must be taken into account that post-mortem serum could rarely lead to blockage of pipetting systems due to clotting phenomena. CONCLUSION: There is no indication that post-mortem samples give false-negative or false-positve results with the test system and test kits used. The procedure described might serve as a model for validating other test kits on post-mortem samples.
BACKGROUND: Some properties of blood are modified post mortem. These modifications might give false-negative or false-positive results in infectious disease testing. Most CE-marked test equipment for infectious serology testing is not validated for testing post-mortal blood. Validation, however, is obligatory, if the results are used for the release of tissues for transplantation. MATHODS: Samples of pre- and post-mortem sera were obtained from 20 cornea donors, and the results were compared for anti-HIV-1/2, anti-HCV, HBsAg, and anti-HBc on the Siemens-BEP-III Automatic System. Negative post-mortem sera were spiked with standard sera (PEI anti-HCV IgG, PEI HBsAg ad 1000 standard, anti-HBc IgG (WHO) NIBSC 95/522, PEI anti-HIV-IV) in concentrations which give low- and high-positive results for the respective marker. RESULTS: All pre-mortem sera were negative for all markers. None of the post-mortem samples was false-positive. None of the spiked postmortem samples was false-negative. Technical errors occurred during the validation process but could be detected and eliminated. Serum samples should be centrifuged immediately after collection, and it must be taken into account that post-mortem serum could rarely lead to blockage of pipetting systems due to clotting phenomena. CONCLUSION: There is no indication that post-mortem samples give false-negative or false-positve results with the test system and test kits used. The procedure described might serve as a model for validating other test kits on post-mortem samples.
Authors: Theodore B Wright; Sai Patibandla; Renee Walsh; Rachel Fonstad; Matthew Gee; Vera Bitcon; Julie Hopper; Susie J Braniff; Susan Best; Scott Read Journal: Transpl Infect Dis Date: 2022-03-03