HairMeasure: A Cost-Effective Device for Measuring Hair Mass Index

Abstract

Introduction: In 2001, Arnold coined the term “Hair Mass Index” (HMI).¹ HMI is an accurate measurement that allows you to calculate the amount of, and thickness of, hair on areas of the scalp by dividing hair mass by the area from which hair is isolated. The HMI has advantages in terms of early detection of miniaturization, hair growth measurement, and hair breakage. HairCheck, a device currently available to measure HMI, is expensive because it requires disposable material for every measurement. Thus, we present the economical “HairMeasure” and “Scalp Zone Identifier” devices that do not require disposable material.

Objective: To design a mechanical device that precisely measures the cross-sectional area of a bundle of hair and a device that can precisely delineate an area of scalp for successive examination.

Material & Methods: A thin metal sheet is used to make the “HairMeasure” device, which is then mounted on one of the arms of a vernier caliper. Using a “Scalp Zone Identifier,” the hair bundle to be measured is isolated. This hair bundle is parked in the slot of HairMeasure and the thickness of the hair bundle is measured by digital vernier caliper. Successive readings are taken in the same way. The Scalp Zone Identifier assists in identifying the same scalp zone without any tattoo markings over the scalp.

Conclusion: The “HairMeasure” and “Scalp Zone Identifier,” which don't require disposable material, are economical devices for calculating HMI and locating the scalp zone area for examination without any tattoo marking.