There is no value for the general gold standard, but there is for the enzyme immunoassay and chemiluminescence method. The s/co value is called the internal qualitative reference value of the enzyme marker, where s indicates the detection value and co indicates the threshold value, as long as the s/co value does not exceed the reference value (usually 1), the test is negative: conversely, it is positive if it is greater than the reference value (usually 1). In addition, the od value indicates the optical density. The s/co value is calculated by the enzyme marker based on the od value, and the final result is obtained. The s/co value is a floating value, you can test 0.01 this time, but the next test may be 0.99, but the final result is the same, both are negative, that is, the s/co value is higher or lower does not mean that the body antibody concentration is higher or lower, it is a number of little significance. The largest value I’ve seen in the test results posted is 0.98, but the final result is still negative. So you should not study the value of the test, the final decision is negative, it only means that the test sample did not detect antibodies or antigens.