Why didn't you send a message after donating blood?

Generally speaking, when donating blood, the blood collector will make a preliminary examination of your blood. Those who pass the preliminary examination will be given blood samples, and then blood donation card will be distributed to blood donors. After the blood collection is completed, a detailed examination will be carried out in the blood station to ensure safety before it is applied to patients. The blood bank does not inform the blood donors of the detailed examination results.

In your case, did the blood collector promise you that he would inform you of the detailed examination results in the future? If they have this service, you can call the blood bank to ask.

I hope my answer can help you, thank you.