Ugh!!! When I was 70 pounds overweight, it was It was easy to draw my blood because the fat anchored my rolling veins. When I lost 70 pounds I have to tell the phlebotomist to anchor my veins so it doesn’t roll away from the needle when I get my blood drawn
This is even more essential if I donate blood since the size of the needle is bigger than say a butterfly needle for a simple tube or two
I would return and ask them to use a more solid technique or provide a different And more experienced phlebotomist for you. If they ask you about your diet, I would tell them that it is nutritionally adequate for you and your doctor agrees.
Good luck and I have learned to stop talking to medical professionals who are yanking my chain. I look them right in the eye and tell them how I expect to be treated, and I let them know that I am also a medical professional myself.
Sorry this happened. There are simple and easy test to test your iron requirements just before a donation unit is drawn. They should’ve just run that test and said yes or no based on the outcome of the test and their criteria for cut off