I had a test run in the UK for Anti DNA and for a positive result you had to be above >20 IU/ml although on contacting my USA doctor he said this is totally incorrect and that the following is what the rest of the world work too
anti-DNA antibodies are reported in IU/ml (international units per ml)
≤4 IU/mL Negative
≥10 IU/mL Positive
How can this be?