Achieving The Density & Coverage Required

When placing grafts a measurement is made as to how many FU´s per cm² are required, this is largely determined by the hair characteristics to ensure light is blocked from reflecting off the scalp and to give the look of fullness

As the head is not a flat surface it is harder to calculate the surface area, it is not as simple as measuring the width and length of the area. The surface area to cover will dictate the number of grafts required, taking into consideration the natural hair characteristics

It is important to understand that everyone is different and different hair characteristics will give different results from person to person

As the recipient area expands it is important aspects such as the hair line design and placement combined with the quality of the donor can sustain a natural balanced coverage over the scalp

The frontal and mid sections can measure around 100 cm², and the crown or vertex also on average 80 to 100 sq.cm. The crown surface area though can open further if the loss spreads to the sides and back, an example of a high Norwood, 6 or 7; larger heads or very aggressive hair loss the area of hair loss can reach closer to 300 cm²

The highest density placed will always be the hair line as single hair follicular units are required; the density can then drop slightly behind as 2, 3, and 4 hair groupings can be distributed to give the illusion of a natural density

On higher Norwood stages the surface area is easier to calculate as hair loss has progressed and unlikely to increase dramatically further

An easy measurement can be made at home to calculate the surface area;

Place a transparent wrap over the scalp and mark out the area of hair loss, then place over the grid sheet to count the number of cm² boxes to give you the surface area; from this it is possible to calculate how many follicular units are required by taking an average density placed multiplied by the surface area total

For example, after judging the hair characteristics an average density required over the area is 35 FU cm²

Surface area 150 cm² x 35 density = 5250 Follicular Units or Grafts

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