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Table 4 Interference of haemoglobin, intralipid and bilirubin was tested by adding these substances to patient samples

From: A new turbidimetric immunoassay for serum calprotectin for fully automatized clinical analysers

Substance Amount of substance Control - mg/L Test - mg/L Observed difference - mg/L Max allowed difference - mg/L Within acceptance (yes/no)
Hemoglobin - low 5 g/L 1,54 1,46 0,08 0,15 yes
Hemoglobin - high 5 g/L 10,06 9,92 −0,14 0,99 yes
Intralipid - low 10 g/L 1,48 1,37 −0,11 0,15 yes
Intralipid - high 10 g/L 9,71 9,7 −0,01 0,97 yes
Bilirubin - low 400 mg/L 1,52 1,5 −0,02 0,15 yes
Bilirubin - high 400 mg/L 10,02 10,01 −0,01 1,00 yes
  1. The calprotectin values before and after addition was compared. A difference of ≤10 % was the criteria for acceptance. None of the substances had significant interference at tested levels