Global Psychotrauma Screen

The GPS in short

  • The Global Psychotrauma Screen (GPS) is a screening instrument designed to identify reactions to a severe stressor or potentially traumatic event (17 yes/no questions).

  • It also assesses risk or protective factors known to influence the course of symptoms (5 yes/no questions).

  • The GPS begins with questions about the event or experience.

  • It can be used in different settings such as in primary care, after disaster, or in clinical practice.

  • The app provides direct feedback on the scores.

  • Scoring positive above the cutoff or on certain domains (e.g. of PTSD, anxiety or depression - see below) may require more detailed follow assessments, e.g. with structured interviews for specific disorders.


Take the GPS


Background and aims

The GPS was developed by an international group of experts representing traumatic stress societies worldwide, called the Global Collaboration on Traumatic Stress (Olff et al., 2020; Schnyder et al., 2017). The aim was to address the need for a brief instrument that would tap the potential wide range of acute or long term consequences of  stressful or potentially trauma events, broader than PTSD symptoms alone (see domains below). It can be applied to tap the consequences of all types of events including more recent ones. 

The GPS consists of 17 symptom items, and 5 risk/protective factor questions, each to be answered in a yes/no format.


​The symptom domains covered in the GPS are:

  • PTSD

  • Disturbances in Self-Organization (DSO) as part of Complex PTSD

  • Anxiety

  • Depression

  • Sleep problems

  • Self-harm

  • Dissociation

  • Other physical, emotional or social problems

  • Substance abuse


Risk and protective factors assessed are:

  • Other stressful events

  • Childhood trauma

  • History of mental illness

  • Social support

  • Psychological

The GPS app

The GPS app was developed to provide easy access to the GPS in several languages. The GPS web app version, in addition to the 22 yes/no items, also asks about the type of event and includes one item on functioning. It also provides immediate feedback on the outcomes.

Not all languages are as yet available through the app (those not underlined below), a pdf can be obtained through the form on this page.



The GPS is currently available in 23 languages:  

The English version has been translated into the languages listed above following the translation and cultural adaptation process by Sousa and Rojjanasrirat (2011).

Norm scores and psychometric properties

Ongoing research suggests good internal reliability as well as concurrent validity with instruments measuring a range of psychotrauma related symptom domains (Olff et al., 2020; Oe et al., 2020; Rossi et al., 2020; Rossi et al., 2021; Frewen et al., 2021). 

Cross cultural data are being collected here.

Scoring positive above the cutoff or on certain domains (e.g. of PTSD, anxiety or depression may require more detailed follow assessments, e.g. with structured interviews for specific disorders.

Using GPS


The GPS is freely available and accessible through the web-app or by requesting the pdf by filling out the form below.

Researchers or clinicians who wish to further translate the GPS in another language are also requested to fill out the form below.

Child and Adolescent versions of the Global Psychotrauma Screen (GPS)

Project leader: Emma Grace

Project Group: Emma Grace, Renee Beer, Li Wang, Nadejda Semenova, Atle Dyregrov, and Miranda Olff

We are looking for collaborators on this project who can help us adapt and validate the GPS Child and Adolescent versions cross-nationally, analyze data, and work on a joint publication of the results, please contact Project Leader Emma Grace.


Aims and method

Recent research indicates that children and adolescents are underrepresented in the assessment and treatment for psychological trauma. This project group seeks to advance knowledge and evidence about the impact of adverse life events on child and adolescent population, and to provide free, valid and reliable screening tools for traumatic symptoms. The aim of the GPS Child and Adolescent Project is to adapt the GPS adult version (Olff et al., 2020) for children and adolescents.

We have initially revised the GPS adult version for children and adolescents in American English. Using the expert consensus approach, we have completed four rounds of revisions on each child and adolescent versions. The adolescent version has then been translated into Chinese, Russian, and Norwegian, while considering local contexts in each country. The next steps are to test the child and adolescent versions for comprehension and to ensure that children and adolescents can understand the GPS items. After that, the pilot testing will be completed to screen for traumatic symptoms and the validation study will be launched.

We invite researchers from around the world who are interested in translating, adapting, and validating the GPS Child and Adolescent versions in their countries to join the project.


Please register here to receive scoring information and further updates



GPS project group

PI: Miranda Olff  (email: m.olff-AT-

Dean Ajdukovic, Anne Bakker, Doug Brewer, Marylene Cloitre, Grete Dyb, Paul Frewen, Emma Grace, Ali Haghi, Juli Lanza, Brigitte Lueger Schuester, Gladys Mwiti, Misari Oe, Janaina Pinto, Indira Primasari, Rita Rosner, Carolina Salgado, Ingo Schaefer,  Yahya Salimi, Julia Schellong, Ueli Schnyder, Jun Shigemura, Kitty Wu.


Frewen, P., McPhail, I, Schnyder, U., Oe, M.,  Olff, M. (2021/in press). Global Psychotrauma Screen (GPS): Psychometric Properties in two Internet-based StudiesEuropean Journal of Psychotraumatology, 12(1),

Rossi, R., Socci, V., Talevi, D. Cinzia Niolu, C., Pacitti, F., Di Marco, A., Rossi, A., Siracusano, A., Di Lorenzo, G., Olff, M. (2021). Trauma-spectrum symptoms among the Italian general population in the time of the COVID-19 outbreakEuropean Journal of Psychotraumatology, 12(1),

Oe, M., Kobayashi, Y., Ishida, T., Chiba, H., Matsuoka, M., Kakuma, T., Frewen, P. & Olff, M. (2020). Screening for psychotrauma related symptoms: Japanese translation and pilot testing of the Global Psychotrauma Screen.  European Journal of Psychotraumatology, 11(1), doi 10.1080/20008198.2020.1810893.

Olff, M., Bakker, A.,  Frewen, P., Aakvaag, H., Ajdukovic, D., Brewer, D., Elmore Borbon, D.L., Cloitre, M., Hyland, P., Kassam-Adams, N., Knefel, M., Lanza, J.A., Lueger-Schuster, B., Nickerson, A., Oe, M., Pfaltz, M.C., Salgado, C., Seedat, S., Wagner, A.,  Schnyder, U. & Global Collaboration on Traumatic Stress (GC-TS) (2020). 

Screening for consequences of trauma – an update on the global collaboration on traumatic stress. European Journal of Psychotraumatology, 11(1), 1752504

Rossi, R., Socci, V., Pacitti, F., Di Lorenzo, G., Di Marco, A.,  Siracusano, A., Rossi, Alessandro (2020). Mental Health Outcomes Among Frontline and Second-Line Health CareWorkers During the Coronavirus Disease 2019 (COVID-19) Pandemic in ItalyJAMA Network Open. 2020;3(5):e2010185. doi:10.1001/jamanetworkopen.2020.10185 

Schnyder, U., Schafer, I., Aakvaag, H. F., Ajdukovic, D., Bakker, A., Bisson, J.I., Brewer, D., Cloitre, M., Dyb, G.A., Frewen, P., Lanza, J., Le Brocque, R., Lueger-Schuster, B., Mwiti, G.K., Oe, M., Rosner, R., Schellong, J., Shigemura, J., Wu, K., & Olff, M. (2017). The global collaboration on traumatic stress. European Journal of Psychotraumatology, 8(1),

Sousa, V.D. &  Rojjanasrirat, W. (2011). Translation, adaptation and validation of instruments or scales for use in cross-cultural health care research: a clear and user-friendly guideline. Journal of Evaluation in Clinical Practice 17 , 268–274

© 2019 by Global Collaboration on Traumatic Stress