A paper in the current issue of Journal of Traumatic Stress looks at, as the title puts it, "Variation in practices and attitudes of clinicians assessing PTSD-related disability among veterans" -- and the results aren't pleasing.
According to the paper's abstract: "One hundred thirty-eight Veterans Affairs mental health professionals completed a 128-item Posttraumatic Stress Disorder (PTSD) Practice Inventory that asked about their practices and attitudes related to disability assessment of PTSD. Results indicate strikingly wide variation in the attitudes and practices of clinicians conducting disability assessments for PTSD. In a high percentage of cases, these attitudes and practices conflict with best-practice guidelines. Specifically, 59% of clinicians reported rarely or never using testing, and only 17% indicated routinely using standardized clinical interviews. Less than 1% of respondents reported using functional assessment scales."
The paper is behind a pay firewall, but Time discusses it here.