NAT tube is widely used in collection, transportion and storage of venous blood samples and sample treament before analysis. Mainly used for inspection of nucleic acid amplification (Incl DNA of HBV, RNA of HCV,HIV) in clinics. The additive of this tube is: EDTA.K2+Gel separator, sterilized by Gamma radiation to ensure no DNAse, RNAse or Pyrogen. EDTA.K2 won’ t affect the activity of Taq enzyme in nucleic acid test,gel separator can eliminate the interference by hemoglobin of erythrocyte in the test of nucleic acid inspection. Samples after separation can be stored at -70℃.