Trauma therapy intake is the part of behavioral health where a half-implemented form engine bites the hardest. You need PCL-5 scoring, branching into Criterion A questions, conditional follow-ups when item scores cross a clinical threshold, and a clean record at the end that an EHR can actually use. That is a different load than a generic patient questionnaire, and not every FHIR form engine handles it well.
This list pulls together the five engines that come up most in trauma-therapy production stacks in 2026, with a rough sense of where each one fits. For more FHIR implementation patterns the broader catalog has the rest of the picture.
For the architectural background, the complete guide to FHIR Questionnaire engines in 2026 sets up what a "real" engine has to do.
The 5 Engines Worth Knowing for Trauma Intake
The shortlist below is ordered by how often it shows up in trauma-therapy production conversations, not by feature count.
- LHC-Forms. The widely used open-source renderer from the US National Library of Medicine. Strong SDC support, calculated expressions that actually total PCL-5 answers, and a long track record in NIH-funded research projects that include trauma cohorts.
- Formbox. A standalone FHIR form builder focused on SDC rendering, expression evaluation, and extraction. Decoupled from any one server, which suits clinics that want to keep their backend choice open.
- Aidbox FHIR Forms. A commercial offering layered on the Aidbox FHIR server. Convenient when the team wants SDC rendering and the backing store from one vendor.
- Beda EMR Forms. A practical SDC layer used in production EMR deployments. Solid handling of enableWhen logic, which matters for the Criterion A branching that PCL-5 requires.
- Pathways Forms. A research-leaning SDC builder used by clinical trial teams. Strong adaptive form behavior, useful when an intake protocol changes between visits.
What Separates Them in a Trauma Intake Stack
Three operational factors tend to drive the choice:
- Scoring math. Calculated expressions that sum item answers and conditionally surface a "screening positive" flag have to evaluate inside the engine, not in downstream code.
- Branching depth. PCL-5 with full Criterion A and follow-up modules is a multi-level enableWhen tree; not every engine renders it the same way on iPad and on web.
- Extraction. A QuestionnaireResponse with five Observations attached (one per PCL-5 cluster score and the total) is a different artifact from a flat JSON dump.
Most teams find that what matters more than feature counts is how the engine handles the awkward middle ground: conditional questions tied to a calculated score that depends on a terminology lookup.
Which Engine Fits Which Team
Research-heavy outpatient teams with internal SDC expertise tend to land on LHC-Forms because of NIH lineage and full open-source flexibility. Mid-size behavioral health clinics with no dedicated form-rendering engineer often pick Formbox or Aidbox Forms for the support contract. Smaller trauma-focused practices building a clinical trial side project gravitate toward Pathways for adaptive behavior.
For the head-to-head with EMR-native forms, the open-source SDC form builders vs EMR-native forms for behavioral health lays out the trade-offs case by case. For a closer look at how engines specifically handle PCL-5 and PTSD screening, the Top 4 FHIR Questionnaire engines for PCL-5 and PTSD screening goes through that specifically.
How to Run a Real Evaluation
Vendor demos rarely show the parts that matter most for trauma intake. Ask each engine to render your actual PCL-5 Questionnaire, branch into a Criterion A follow-up, total the cluster scores into a calculated expression, and extract the response into FHIR Observations. The output of that hour-long exercise tells you more than a feature spec sheet ever will. The engines that pass it on the first try are the ones worth pricing.
Sources
- LHC-Forms project page and demos - Tool documentation, NLM Lister Hill Center, 2025
- LOINC 101697-1 PCL-5 DSM-5 panel definition - LOINC code page, Regenstrief Institute, 2025
- SDC Base Questionnaire StructureDefinition - HL7 spec, HL7 International, 2025
