Fig. 2From: Comparison of whole blood cytokine immunoassays for rapid, functional immune phenotyping in critically ill patients with sepsisIFNγ and TNF concentrations measured by ELLA immunoassay, following ex vivo exposure of whole blood to immune stimulants. A Coefficient of variation of pooled IFNγ measurements, B coefficient of variation of pooled TNF measurements, C IFNγ and TNF responses measured by ELISpot immunoassay following 4 or 18 h of exposure to immune stimulants. CINS  critically ill and not septic patients, LPS  lipopolysaccharide, CD3/CD28  anti-CD3 and anti-CD28 antibodies, PMA/iono  phorbol 12-myristate 13-acetate and ionomycin. Blue dotted lines represent upper and lower limits of reliable detection provided by manufacturer. P values based on ANOVA analysis using log2-transformed cytokine concentrations from three patient cohorts (healthy, sepsis, CINS). *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001Back to article page