Conversation: The conversation between human and AI assistant.
[|Human|] I went to donate blood today for school blood drive and when they got the needle half way in it got stuck and wouldnt go any farther and then they said it was clotting. And i was wondering what happened there. And then they tried my right arm and couldnt find a vein. And wondering if would be able to donate blood with out waiting 8 weeks.
[|AI|]  Hello and thanks for the query, This is a bit unusual.  Sometimes if there is a valve in the vein it can cause difficulty in advancing the needle.  Since you did not donate blood in light of this complication you should still be able to donate again without having to wait 8 weeks.  This is up to the discretion of the medical director of the blood bank, however.  You might call the donor center to inquire and if there is any confusion ask them to review your file with the medical director and that physician may clear you to come and donate again. Thanks again for the query,