KEQAS participants area


This page is for KEQAS participants, providing the information needed for trouble free participation.


  • Investigation of bias (PDF 77Kb). At ISTH 2013 we presented a poster highlighting the major sources of methodological bias, and compared results from the novel tandem mass spectrometry method to that of the established fluorescence method.
  • Pilot schemes for analysis of menaquinone-4, menaquinone-7 and vitamin K1 2,3-epoxide are now available (see below for results).
  • Standard reference material now available. For more information, email David Card -
  • Join our KEQAS group on LinkedIn.


Batch reports

Pilot scheme results

Submit results

Email results to When submitting results please include your group number, method used, and the results for all three samples. You can attach the results submission form (Word 162Kb) to the email if you wish.