Description, Administratrion and Scoring

Description

"The PCL is a 17-item self-report measure of the 17 DSM-IV symptoms of PTSD. The PCL has a variety of purposes, including:

  • Screening individuals for PTSD
  • Diagnosing PTSD
  • Monitoring symptom change during and after treatment

1. The PCL-C (civilian) asks about symptoms in relation to "stressful experiences." The PCL-C is useful because it can be used with any population. The symptoms endorsed may not be specific to just one event, which can be helpful when assessing survivors who have symptoms due to multiple events. Typically, it is optimal to assess traumatic event exposure to ensure that a respondent has experienced at least one Criterion A event.

2. The PCL-S (specific) asks about symptoms in relation to an identified "stressful experience." The PCL-S is useful because the symptoms endorsed are clearly linked to a specified event. Typically, it is optimal to assess traumatic event exposure to ensure that the event meets Criterion A. Respondents also may be instructed to complete the PCL-S in reference to a specific type of event.

Administration and Scoring

The PCL is a self-report measure that can be completed by patients in a waiting room prior to a session or by participants as part of a research study. It takes approximately 5-10 minutes to complete a PCL. Interpretation of the PCL should be completed by a clinician.

The PCL can be scored in different ways:

  • A total symptom severity score (range = 17-85) can be obtained by summing the scores from each of the 17 items.
  • A diagnosis can be made by:
    1. Determining whether an individual meets DSM-IV symptom criteria, i.e., at least 1 B item (questions 1-5), 3 C items (questions 6-12), and at least 2 D items (questions 13-17). Symptoms rated as "Moderately" or above (responses 3 through 5) are counted as present.
    2. Determining whether the total severity score exceeds a given cut off point.
    3. Combining methods (1) and (2) to ensure that an individual has sufficient severity as well as the necessary pattern of symptoms required by the DSM.

Interpretation

A lower cutoff should be considered when screening or when it is desirable to maximize detection of possible cases. A higher cutoff should be considered when attempting to make a definitive diagnosis or to minimize false positives.

Measuring Change

Good clinical care requires that clinicians monitor patient progress. Evidence suggests that a 5-10 point change represents reliable change (i.e., change not due to chance) and a 10-20 point change represents clinically significant change. Therefore, we recommend using 5 points as a minimum threshold for determining whether an individual has responded to treatment and 10 points as a minimum threshold for determining whether the improvement is clinically meaningful (7)."

 ~National Center for PTSD