Vitamin K1 at endogenous concentrations in human serum
Full 17043 (ref 7586)
Assessment of vitamin K status
PURPOSE OF PROGRAMME:
Harmonisation of vitamin K status assessment
|Vitamin K1 (accredited)||ug/L|
|Vitamin K1 2 3-epoxide||ug/L|
MATERIAL PROVIDED: Serum and ethanolic standards
DISTRIBUTIONS PER YEAR: Four
SAMPLES PER DISTRIBUTION: Three
FREQUENCY OF DISTRIBUTION: Once annually
PROGRAMME OF ANALYSIS:
Grubbs test for outliers and Z scores
PERSISTENT POOR PERFORMANCE:
Outlier or Z score > 3 for two consecutive rounds, Z score > 2 for three consecutive rounds.
The External Quality Assessment Scheme for Vitamin K was founded in 1996 by Dr Dominic Harrington and Dr Martin Shearer at Guys and St Thomas' Hospital, London. In 2008 the Service became known as the UK National External Quality Assessment Service for Vitamin K. KEQAS is part of the Viapath Analytics LLP.