Wollenberg et al., Nürnberg, Germany. In Clin Lab, 2012
METHODS: During the one year study period, 15 laboratories applied 7 different tests and included a liquid BIOREF control serum with pancreatic carcinoma derived CA 19-9 in their routine testing and quality control procedures.
METHODS: Precision and long-term stability of 7 commercially available estradiol immunoassays were assessed in a multi-centre quality control study based on the repeated measurement of liquid BIOREF estradiol control sera by 18 laboratories during a 14-month study period.
This communication deals with a longitudinal evaluation of C-reactive protein (CRP) analysis during a one-year period using a single lot of liquid control sera (3 levels) (BIOREF-CRP levels 1, 2 and 3) in different laboratories.
MATERIALS AND METHODS: Laboratories using BIOREF reference material sent their routine internal quality control results of each monthly control period to the evaluation center for statistical analysis and inter-laboratory comparison.