DSG1 and acquired polycythemia vera: Using the suggested manufacturer cut-off value of 20 RU/mL for serum anti-Dsg 1 and anti-Dsg 3 ELISA, the sensitivity of serum Dsg ELISA in untreated PV patients in our study was 72.1% for anti-Dsg 1 and 96.5% for anti-Dsg 3, respectively.