2, S/CO, on behalf of the blood samples measured value and the critical value (whether the critical value of infection) ratio, less than 1 are normal, that your blood samples measured value is less than the value of infection.
3, 0 - 1 data between no difference, as long as less than 1 are negative.
4, 0 - 1 between the data is different mainly reagents and instrument precision, of course, with the individual also has a relationship. You don't need to pay attention to these, as long as it is negative.