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Densitometry and Video-microscopy

In evaluating a person with androgenetic alopecia for a hair transplant, typically the physician determines the patient’s Norwood Class, designs a hairline, delineates the extent of coverage, “eyeballs” the donor area, and then decides upon the appropriate number of grafts. Taking specific measurements of hair density and donor miniaturization are not routinely performed. However, donor density and miniaturization are important variables in deciding which patients are good candidates for hair transplantation and are useful in determining how many grafts are needed in the procedure. Densitometry is a technique that analyzes the scalp under high-power magnification to give information on hair density, follicular unit composition, and degree of miniaturization. It can be used to help evaluate a patient’s candidacy for hair transplantation and help predict future hair loss. More recently, video-microscopes have been developed that can project the image onto a computer screen and provide a permanent digital record. This paper describes the value of taking objective measurements, using densitometry or video-microscopy, in the hair transplant evaluation.