FUE Harvesting Limit?

What is the approximate limit for FUE harvesting, e.g. at what point does taking out individual grafts one at a time start to noticeably thin the hair in the back?

The answer here varies with the many attributes of hair that include:

1. density
2. hair thickness
3. hair character / texture
4. hair color and contrast to skin

You can use possibly 90% of the donor hair if your characteristics from the above are good. If they aren’t, the actual number may be well below 50% of the donor hair before you start to look noticeably thin. We have had a few patients who have had as many as 25,000 hairs taken from the donor area without any detectability. These were fairly bald men or those who were perfectionist. I recently saw one of these men and even though the original donor density was reduced by significantly more than 50%, the donor area looked good, even under close inspection.