External quality Command, also called external good quality assessment (EQA) or proficiency tests (PT), is an important course of action for ensuring the precision and trustworthiness of laboratory testing.[79] In this assessment, surrogate samples are supplied by an independent external organization, plus the laboratory is unaware in the anticipated values http://puurpositief.nl/24-uurszorg-thuis-dag-en-nachtzorg-bij-u-thuis/