Cumulative Hair Thickness shows the total thickness of all hairs within one square centimetre of the scalp.
It is expressed in mm/cm².
🧮 How is it calculated?
Cumulative Hair Thickness is calculated using:
Hair density × Average hair thickness
Example
Hair density: 200 hairs/cm²
Average hair thickness: 60 μm
Calculation:
200 × 60 μm = 12,000 μm = 12 mm/cm²
The Cumulative Hair Thickness is therefore 12 mm/cm².
🔍 How to understand the result
A higher value usually means that the examined area contains:
more hairs,
thicker hairs,
or a combination of both.
A lower value may result from:
reduced hair density,
thinner or miniaturised hairs,
or both.
📈 Why is this parameter useful?
Cumulative Hair Thickness is particularly useful for follow-up examinations.
It can show an overall improvement or deterioration even when changes in hair density or average hair thickness are relatively small.
For example, the number of hairs may remain similar, but if the hairs become thinner, Cumulative Hair Thickness will decrease.