This hair loss question was answered by Dr. Glenn Charles of Florida who is a member of the Coalition of Independent Hair Restoration Physicians. His professional answer is below.
After 2 hair transplants (800 and 2000 grafts), I never experienced hair loss in the donor area, but I did this 3rd time after 2600 follicular unit grafts. I was wondering if anyone else had similar issues.
Unfortunately, there is no test we can perform to determine who will get hair loss (telogen effluvium) due to shock and who will not. I have had several hair transplant patients over the years with similar stories to yours. They had multiple procedures but only had donor shock loss after one of the procedures. I am happy to say that in all those cases the patients eventually had full recovery in the donor area.
Dr. Glenn Charles, D.O.