Here are some ways you can tell you have yourself a shed hair:
1. The hair is long in length. If you constantly see short hairs lying around (unless your hair itself is short), examine your regimen and see if you are being too rough with your hair or if something you're using in your regimen is causing it to break (i.e. brushes, heat, protein sensitivity, medication)
2. The hair has a white bulb attached. Examine the picture above. If you click it, it will enlarge. This is some hair loss during a recent detangling session. If you look closely you can clearly see about 3 white dots in the picture. These are shed hairs. If the hairs that you are loosing do not have a white bulb attached, those are probably broken hairs.
Examine the hairs you loose during your next wash session. Are your hairs broken or shed?