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clinical research · trial reporting

Three-arm CONSORT flow diagram

A three-arm CONSORT flow diagram extends the usual parallel trial structure by adding one allocation branch. The enrollment section records who was assessed, excluded, and randomized. Each arm then needs its own allocation, follow-up, and analysis counts. Put the treatment or dose name in the allocation box so readers can match the branch to the study methods. If participants discontinue or are excluded from analysis, record the count and reason in the correct branch. Keeping each arm aligned beneath randomization makes it easy to compare retention and analysis populations across all groups. Use the final counts that correspond to the analysis described in the results.

Type FlowchartStandard Sugiyama layered DAG + orthogonal routingEngine schematex-flowchartUpdated 9/24/2026
Three-arm randomized trial participant flow
Drawing preview
The request

“Draw a three-arm CONSORT flow diagram with 210 assessed, 30 excluded, 180 randomized equally to dose A, dose B, and placebo, then completed follow-up counts of 57, 55, and 58 and matching analysis counts.”

Then tryAdd a discontinuation reason for dose B.Change placebo allocation to 70 participants.
What is in this drawing

Read the decisions behind it.

01Common entry

Keep screening and randomization together before branches.

02Equal allocation

Label the assigned count for every arm.

03Parallel follow-up

Show completion separately in each arm.

04Final analysis

Keep analysed counts directly below their arm.

Use this for trials comparing two active doses with placebo or any other three parallel treatment groups.

More like this

Other examples in this family.

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Cluster randomized CONSORT flow diagramclinical researchOpen →
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Parallel-group CONSORT flow diagramclinical researchOpen →
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CONSORT Flow Diagram: Cluster Randomized Trial for School-Based Obesity Preventionclinical-trialsOpen →

Browse all flowchart templates →

FAQ

Common questions

Can a CONSORT diagram show three study arms?

Yes. Add a parallel branch for each allocation arm and continue each through follow-up and analysis.

Where do dose names go?

Put them in the allocation labels so each branch clearly identifies its intervention.

How should follow-up be reported?

Give the completed, lost, or discontinued counts separately for every arm.