After donating blood for free, I received a short message: Gray Zone 2 detects other antibodies, and I can donate blood again after six months. This other antibody 2 gray area? What do you mean?

In order to ensure the safety of blood for clinical use, the necessary items of blood after blood collection are very strict, and reagents from two different manufacturers must be used for testing, with very high standards. The gray area of antibody 2 indicates that it is not negative and has not reached positive, but the blood must be discarded.

I suggest you donate blood after half a year. If nothing happens, it's a false alarm.