The hairs can be transplanted as much as your donor area or safe area allows. In literal terms, a surgeon can take as many follicles from the safe area depending upon the donor density and plant them in the recipient site or the balding areas. However, there are still some points of consideration which we have discussed below.
On an average, an adult Female’s head consists nearly about 1, 00,000 hair follicles while a male scalp between 20,000 to 60,000 hair follicles. Although only 10,000 hair follicles are suffice to cover the head and prevents to make it look bald.
In conditions of baldness, there is already 50% loss of follicular units in the bald region. The average density of a non bald scalp is 80-100 follicular units per square cm. This density differs from person to person. Hair transplant can hide the baldness in single session, but it cannot typically offer the natural density in one sitting. In hair transplantation, doctors can harvest 25-35 follicular units (FU) per square cm, which is too less than the normal density, though this amount of density can conceal the baldness with artistic harvesting of the grafts. For average density, a second sitting of 25-35 follicular units (FU) per square cm is needed. Sometimes, a third sitting may also be needed for a complete natural look.
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Number of donor hair needed for hair transplant surgery varies as per the density of your Occiput– the back area of your head where hairs are not “genetically programmed to fall out or die.” On an average, density in the donor area (back region of scalp) is 60-120 follicular units per square centimeter or 120-200 hairs. Head hair is considered to be the best for transplant because of their superior density, quality, texture of hairs and consistent angulations. Chest or other parts of body hair (legs or arms) can be too fine and much sparser than it appears, with a high transaction rate making it difficult to use.
Normal hair density – in people not suffering from hair loss – is near around 80-100 follicular units per square centimeter of scalp. Thinning is not seemingly obvious unless around 50% of the native density has fallen off from the roots. This indicates transplanting between 45-55 follicular units per square cm during hair transplantation is usually sufficient.
Harvesting at densities of 80-100 FU per square cm (“normal” hair density) is generally never done. This happens for some reasons like:
Due to these, the maximum density attainable with hair transplant surgery is generally somewhere below natural hair density. While most doctors will implant anywhere between 45-65 grafts per square cm, some will transplant at moderately higher densities. These doctors will only do so when they are sure they will not cause severe shock loss or stun the scalp blood supply.
The amount of transplanted grafts in single session can be as high as 5000 grafts if the strip surgery is used and density is good.
One of the best characteristics of the NeoGraft- new automated hair transplant procedure which simplifies the implanting of follicles during Follicular Unit Extraction (FUE) hair transplant is that as many grafts can be extracted and implanted on the scalp, as long as there is plentiful of donor hair density. It is common to take about 2,000 grafts during a procedure.
The maximum amount of grafts that can be transplanted is 20,000- 25,000 grafts, in area of approximately 15cmx25cm (Top, front and crown).
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