Differential Diagnosis Lab

The Politicized Practitioner

Differential Diagnosis Lab

Interactive cases for learning how to build, test, and document a differential diagnosis—one symptom, decision tree, comparison table, and provisional formulation at a time.

Start with the method. These simulations do not ask you to guess a diagnosis. They ask you to show how you ruled possibilities in, ruled them out, or retained them as uncertain.

The seven-step trees-and-tables method

1 Broad rule-outs
2 Key symptoms
3 Tree matching
4 Tree walks
5 Candidate list
6 Table comparison
7 Provisional formulation

How to use each pair: complete the A case first for guided coaching. Then complete the B case with fewer prompts and compare your reasoning with the expert debrief.

Related reading

Diagnosis has a history

Explore the history, power, and assumptions surrounding psychiatric diagnosis.

Depression and low mood

Possible mania and mood instability

Hearing voices, unusual beliefs, and psychosis

Anxiety and excessive worry

Intrusive thoughts

Trauma-related symptoms

Attention and concentration problems

Emotional instability and relationship crises

Dissociation and feeling unreal

Eating and food restriction

Confusion and cognitive change

Physical symptoms without clear explanation

Substance use and psychiatric symptoms

Clinical boundary. The lab is educational. Use current diagnostic criteria, supervision, scope-of-practice requirements, medical evaluation, and local emergency procedures in real practice.

Where to go next

  • Mental health screeners

    Free screening questionnaires for attention, anxiety and mood, with guidance on using them in assessment.

  • Continuing education

    Structured CE pathways in psychodynamic practice, supervision and anti-oppressive care.

  • Clinical supervision

    Case consultation on assessment, formulation and using the DSM critically.