Related Experiment Video
Updated: Feb 6, 2026

Separation of Follicular Cells and Oocytes in Ovarian Follicles of Zebrafish
Published on: April 18, 2021
Effect of Follicular Unit Extraction on the Donor Area
Muhamamd Humayun Mohmand1, Muhammad Ahmad1
1Plastic and Hair Restorative Surgery Department, Hair Transplant Institute, Islamabad, Pakistan.
Background:
Hair restoration surgery is one of the most commonly performed cosmetic surgery procedure in men. The main aim of the study was to know the effect of follicular unit extraction (FUE) follicular unit extraction (FUE) on donor area in terms of hair mass/density.
Methods:
Ten male patients undergoing hair restoration by FUE were included. In each patient, ten boxes of 1 cm2 each were marked. The first box was marked in the midline and the 2nd and 3rd boxes were marked about 3 cm from the midline. Another two boxes, each of 1 cm2 were also marked at the distance of 3 cm. Two boxes of 1 cm2 were marked on either side. The extraction was performed using 0.9 mm punch. The number of extracted hair were counted.
Results:
The mean age of the patients was 31.7 years. The average hair count in the donor area was 154.76 hair per cm2. The extracted hair count was 54.85 hair per cm2 which was about 35.44% of the total donor density (range: 28.9-42.8%). The graft to hair ratio in the extracted follicular units was 1:2.3 (range: 1:1.65-1:2.75).
Conclusion:
As the donor density varies, the FUE should be performed with caution.
Related Concept Videos
Measurement: Standard Units
Measurement: Derived Units
Units of Measurement
There are various well-known historical measurement systems, such as the Babylonian system, the Roman system, the Egyptian system, the Olympian system, the British system, and the Indus...
International System of Units
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
Motor Units
Motor Units
Motor units come in different sizes, with smaller units...

