The sensitivity and specificity, PPV and NPV of the other three hemoglobin screening methods with reference to the Coulter counter using capillary and venous blood samples are shown in table 2.
The concordance correlation coefficient between Hemocue and the reference method was 0.74 (capillary samples) and 0.89 (venous samples) whereas the corresponding values obtained for Cyanmeth Hb method were 0.78 and 0.91, respectively.
The mean Hb value as obtained by the reference method was higher with capillary samples in comparison to the venous samples (Mean difference=0.2g/dl)