The 5 good reasons to participate in a proficiency test :

The results for between laboratory standard deviation by the abovementioned intercomparison are given in the table below

An EC collaborative study (4th intercomparison) was arranged in which three samples were analysed by up to 12 laboratories to certify the method for hydrolysis.

The repeatability expressed as within laboratory standard deviation of the abovementioned intercomparison is given in the tables below

Another EC collaborative study (3rd intercomparison) was arranged in which two samples were analysed by up to 13 laboratories to certify the method for extraction of free tryptophan.

Each analytical sequence contains reference materials, and the INSPQ also participated in an inter-laboratory comparison program.

When an interlaboratory test comparison is conducted for the express purpose of determining a laboratory’s capability to conduct specific diagnostic tests, i.e. 1.3.i above, it is referred to as proficiency testing.

Analytical accuracy was demonstrated for by the successful participation in the proficiency test of the German External Quality Assessment Scheme (G-EQUAS).