The customer does not provide specific product information or pictures.According to the customer description, there may be two situations: 1.The swab has blood stains before use.Swab is a packaging operation carried out in a purified environment, and there is no possibility of blood stains.Since there is no specific product information or pictures, an effective investigation cannot be carried out, and it is necessary to follow up whether customers provide new information.In the production process of the product, no such phenomenon has been found, but it cannot be ruled out that individual raw materials are defective.2.Blood stains appear after sampling with swab.There are clear requirements in the instructions:do not use on anyone who is prone to nosebleeds or has had facial or head.In view of the existence of blood stains after sampling, the verification result: endogenous interfering substances /whole blood(4% ):no cross-reactivity and no interference.
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