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PSA Standardization

Hybritech vs. WHO Standardized Assays12,14

Slide 19

October 2009

Summarizing these purely analytical differences, it is notable that the WHO standardized calibration yields PSA values between 10 to 20% lower than the Hybritech assays, a difference that is likely due to the different mass assignments of the standards.  The initial impact of this calibration change was not realized by the medical community but awareness is certainly increasing.

Hybritech vs. WHO


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