The Card Test For lighter hair colours.
Card Test For Lighter Hair Colours.
The contrasting hair card tests for lighter hair colors. The use of a piece of paper of contrasting color to the hair is an excellent means to evaluate recent changes in hair growth. For example, in this patient with blond hair we can see thay signficant growth has occured in the last 3-4 months. This immediately informs me that either a massive telogen shed occured 4 months ago or a growth promoting agent was started 4 months ago. In this case it helped pinpoint the precise timing of a telogen effluvium due to surgery.
This article was written by Dr. Jeff Donovan, a Canadian and US board certified dermatologist specializing exclusively in hair loss.