Reference materials

Samples from the proficiency test schemes are available as reference material, which can be used for method development or as reference samples for internal quality control. The reference materials are delivered with a certificate of analysis or summary statistics. These documents are based on results from the WEPAL-QUASIMEME proficiency test schemes. The certificates provide information about:

  • the consensus value: the mean value of the dataset obtained from the proficiency test, calculated with robust statistics
  • the standard deviation and coefficient of variation
  • the number of results used to calculate the consensus value
  • the median and MAD (Median of Absolute Deviation)

Overview reference materials and how to order

Check the WEPAL-QUASIMEME webshop for a complete overview of available reference materials and information on how to order.


Fees depend on your choice. Participants of the WEPAL-QUASIMEME programmes are entitled to a discount.