The UK NEQAS for Vitamin K Scheme is in the process of transitioning from Synnovis Analytics LLP, operating the Vitamin K External Quality Assurance Scheme (KEQAS) to Birmingham Quality. The transition will be complete by 1st January 2023.

Please contact Birmingham Quality if you have any queries for the 2023 registration period. Birmingham Quality is continuing to offer the Vitamin K and pilot analytes. The pilot analytes (as listed below) are not accredited to ISO/IEC 17043:2010.

KEQAS Standard Reference Material-2 (SRM-2) is a serum reference material for validation of methods measuring vitamin K1 (phylloquinone). It is available to purchase from the Nutristasis Unit, Synnovis. Please contact or for further information.

Scheme Particulars Indicative Details
Accreditation body UKAS
UKAS Accredited Proficiency Testing Provider No 7860
Number of distributions per year (nominal) 4
Specimens per distribution 3 (2 for pilot analytes)
Frequency of distribution Quarterly
Material distributed Single or Pooled, liquid serum with or without exogenous added analyte
Nominal sample volume (mL) 1.8
Programme Director(s) / Organiser(s) Rachel Marrington
Analyte Approximate Range Default Scheme Units
Vitamin K1 0 – 8 ug/L
K1 (Pilot) 0 – 8 ug/L
K1 2,3-epoxide (Pilot) 0 – 20 ug/L
MK-4 (Pilot) 0 – 20 ug/L
MK-7 (Pilot) 0 – 20 ug/L

Analyte not yet accredited to ISO/IEC 17043:2010

  • Download Vitamin K 2024 schedule 52 KB

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