All EQA schemes offered by INSTAND are accredited according to DIN EN ISO/IEC 17043:2010.

The testing of proficiency test samples to ensure stability is carried out in the reference laboratory of INSTAND.

It can also be subcontracted to the following laboratories:

INSTAND is one of the three reference institutions appointed by the German Medical Association (Bundesärztekammer) and thus responsible for the organisation of EQA schemes for quality control in medical laboratories.