1. Plasma is recommended to be anticoagulated with EDTA or Sodium citrate (dilution 1:9). If it cannot be used immediately, it is recommended to be stored at 2-8 ℃ to complete the test within 24 hours. If the test cannot be performed within 24 hours, the sample should be frozen at -20℃, valid for 1 month.
2. Samples containing sediment or flocculent material should be centrifuged (4000rpm, 10min) and then tested.
3. Samples must be returned to room temperature (10-30℃ ) before testing. Frozen samples should be completely thawed, rewarmed and mixed well before use. Do not repeatedly freeze and thaw.
4. Heat inactivated samples, hemolysis and other abnormal samples should be discarded.