Look at your client’s hair and scalp to see the distribution of any hair thinning (which can often indicate why it is falling out).
By comparing the partings at different positions—for instance, the crown area, front area, sides, and back—differences in hair quantity can be seen and the amount of thinning can be determined.
The distribution of hair could indicate the presence of a genetic condition, traction alopecia, etc.
Use of a magnifying lens or computer microscope can help you see how many of the hairs have become finer in diameter.
Look for the quantity of regrowth and whether the hairs are tapered at the tip or flat ended. The former would indicate a new hair, the latter a cut or broken hair. A lot of broken hair may indicate that cosmetic factors contributed to the hair loss.
If necessary, look at the hair under a regular microscope. This will help with your analysis.