The essential features are binge eating and inappropriate compensatory behavior such as fasting, vomiting, using laxatives, or exercising to prevent weight gain. Binge eating is typically triggered by dysphoric mood states, interpersonal stressors, intense hunger following dietary restraints, or negative feelings related to body weight, shape, and food. Patients are typically ashamed of their eating problems, and binge eating usually occurs in secrecy. Unlike anorexia nervosa, bulimia nervosa patients are typically within normal weight range and restrict their total caloric consumption between binges.
There are several different ways of interpreting the scores given by the PTSD Checklist-5. For a person to have a probable diagnosis of PTSD sufficient criteria must be at least moderately met in each of the four symptom groups. This means you need to have one or more symptoms from questions 1 to 5, either question 6 or 7, two or more from questions 8 to 14, and two or more from questions 15 to 20, each of which must be met moderately , quite a bit or extremely. In addition, a score of 38 or higher indicates probable PTSD in veterans; the score may be set higher or lower for civilians; no agreement has been reached yet since it was only developed after the DSM-5 was published in 2013. A lower cut off may be used for initial screening rather than probable diagnosis, the maximum score is 80. ,  For those people already diagnosed, it can be used to measure improvement (see below).
A definite diagnosis can only be given by a clinician, and depends on the details of the extremely stressful experience described at the top of the form and the effect on the individual, a clinician would also need to ask questions about the problems to check the person's understanding of each question and that the PTSD criteria are fully met. The PCL-5 scores are not comparable with scores from the PCL-C, PCL-M or PCL-S because the number of questions and points per question differ.