Relationship between dried blood and plasma triglyceride concentrations in 75 paired samples. Regression curve for triglyceride measurement in fresh plasma and blood dried on filter paper. Triglyceride values (n = 75) obtained in dried blood were correlated with values obtained in fresh plasma. Equation for the line is y = 0.88x + 0.13 (r = 0.97, P < 0.001). The intraclass correlation of the paired samples (ICC) is 0.96. Values represent the mean of duplicate measurement.