I'm at home, so I don't have all of your details.
Do you remember what your density was like before you began HT?
You have had 3 strips and one session of FIT, correct?
Have you had your densities measured after any of the procedures?
Do you know your current donor density?
If not, no big deal. We can get some measurements when you come in.
Also, good donor preservation and management depends on different types of densities such as follicular density (hairs in an area) and calculated density (hairs per follicular unit). Here's some general, but related information:
After surgery, your follicular density (how many units are in an area) changes because:
1. follicular units are missing
2. surface area has changed
Typically, the donor goes through density changes after surgeries. When a strip is cut out, you lose that amount of follicular units available in the donor. But, you also lose surface area because a lot of tissue is removed, much more than is removed with FIT. When the wound is closed, it pulls the rest of the scalp closed. Because the surface area has changed, your follicular density goes down per square centimeter. Imagine if you have a polka dot shirt made of stretchy material (bad, girly example, but bear with me). If you stretch the material, the dots spread apart. The density is less. Such is the effect after a strip. The extent of the change depends on healing, size of strip, etc.
Not only is the follicular density less after strip, but it doesn't have a consistant effect over the whole donor. Some areas will stretch more than others. Usually, the area below the strip will have lower density than the area above the strip. Example: http://www.forhair.com/hairtransplant/viewtopic.php?t=378&highlight=shaved+head
. Sometimes direction of hair growth can also change, effecting donor coverage, but that's a different topic all together.
With FIT, there is no stretching and far less surface area removed. The density is still spread evenly and naturally throughout the donor. There is less follicular density because units were removed. Typically, less than 25% of the units are removed in a given area therefore there is not a noticeable difference in density with short to medium length hair. Example: http://www.forhair.com/hairtransplant/viewtopic.php?p=3806#3806
Dr. Cole is THE expert for donor preservation. When you come in, he will take measurements and plan out the best surgical route for you. He has techniques to overcome almost all obstacles. If you want more hairs per unit, he has FIT methods and techniques. If you want to minimize the change in follicular density, he has FIT farming. If you want to graft your scars, revise your scars, take hair only from the most dense areas, pick out the finest hairs for the hairline and temple points, etc. He has the methods to do so.
Every patient gets an individualized surgery from Dr. Cole. In the first 10 minutes of extraction he makes at least a dozen adjustments to customize the surgery to your hair, goals, scalp, hair characteristics, future hair loss, etc. As he is extracting grafts, the surgery team is busy at the microscopes, compiling statistical reports for your head. The punches he invented (which I'm not supposed to talk about yet, so don't ask) have several adjustable variables built in so he can customize each surgery for top results.