The Posttraumatic Stress Disorder (PTSD) Checklist (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. There are three versions of the PCL: PCL-C (civilian), PCL-M (military) and PCL-S (specific). PCL-M asks about symptoms in response to “stressful military experiences” and used for active service members and veterans. The PCL-M can be completed by participants of a research study in approximately 5–10 minutes. Interpretation of the PCL-M should be completed by a clinician. There is no valid PCL-M Latvian language version.

The goal of the study is to assess the evaluative and discriminative properties of the Latvian language version of the PCL-M in PTSD risk group patients (PTSD-RGP).

Totally 30 participants (males, Europeans, of average age 26.2, PTSD-RGP - Latvian Contingent of International Operations) were examined. Standart validation protocol was applied for PCL-M Latvian language version's reliability and validity testing: reliability consequence, construct validity, test-retest, Cronbach alpha criterion.

Cronbach alpha criterion was more than 0,70 (means reliable response sets), the reliability-consequence scale is from 0.6 to 0.9 (means precise definition). Test-retest by Spearman showed r ≥ 0.75 (means reliable stability).

It was concluded that the PLC-M Latvian language version has sufficiently acceptable evaluative and discriminatory properties and is therefore a valid instrument for PTSD measurements in clinical and research studies in Latvian military active service members and veterans.