An inflammatory reaction is induced after release of proinflammatory mediators such asinterleukin 1 and 6 and tumour necrosis factor α. These mediators stimulate the liver tosuppress the syntheses of albumin and endure the syntheses of acute phase protein forinstance C-reactive protein. The aim of this paper was to perform a method validation on animmune turbidimetric assay to quantify C-reactive protein in canine serum at the laboratory atSkara Animals Hospital, Skara, Sweden. The validation involved evaluation of the assaylinearity, precision, stability and recovery.The method was proved to be linear for both TruLab control and Medinor control. TheTruLab control is based on human C-reactive protein while the Medinor control is based oncanine C-reactive protein. The precision of the method had a CV of 2.26 % (n=40). Themethod is considered stable and has good precision, under the circumstance that the TruLabcontrol is used. It was concluded that a Canine CRP-control is required and should beincluded in routine analysis.