There are two widely known female hair loss density scales used by most hair loss specialists: the Ludwig Scale and the Savin Scale. For all intents and purposes, they are identical except that the Savin Scale also measures overall thinning. 

As you will see in these illustrations, eight crown density images reflect a range from no hair loss to severe hair loss. Density 8 is rarely seen in clinical practice. One example of frontal anterior recession is also illustrated (again, it's not too common), and one example of general diffuse thinning, lateral view, is shown.