Red Flags & Dispositions on Part IV

Part IV is quietly a triage exam. Every case resolves to one of three dispositions, and the single highest-leverage skill is recognizing when a patient is not yours to treat. Miss a red flag and treat anyway, and you can run a flawless encounter and still fail the decision that mattered.

The three dispositions

• Treat in the office — a musculoskeletal problem within your scope; manage it.
• Requires additional testing or co-management — you need imaging, labs, or another provider before or alongside care.
• Urgent referral / outside your scope — this needs someone else, now.

Getting the disposition right lives inside the Clinical Decision Making & Case Managementdomain, and it's where a case is won or lost. The exam builds cases specifically to see whether you can tell a treatable mechanical complaint from a masquerading emergency.

The red flags worth memorizing

These are the “stop and reconsider” findings across the content areas. When one appears, your job shifts from “treat” to “work up or refer.”

Malignancy

• History of cancer, especially cancers that metastasize to bone (breast, prostate, lung, kidney, thyroid).
• Unexplained weight loss, night pain that wakes the patient, pain unrelieved by any position.
• Age > 50 with new back pain that doesn't behave mechanically.

Cauda equina / progressive neurological deficit

• Saddle anesthesia, new bowel or bladder dysfunction (retention or incontinence).
• Bilateral leg symptoms, a rapidly progressing motor deficit, or global weakness.
• Upper-motor-neuron signs (hyperreflexia, clonus, Babinski) pointing above the complaint.

Cardiovascular / pulmonary

• Chest pain with exertion, radiation to jaw/arm, diaphoresis — cardiac until proven otherwise.
• A pulsatile abdominal mass or tearing pain radiating to the back — think AAA.
• Calf pain/swelling (DVT) or pleuritic pain with dyspnea (PE).

Infection & the rest

• Fever, night sweats, IV drug use, or recent infection with spinal pain — think discitis/osteomyelitis.
• Visceral referral patterns (GI, renal) that don't fit a mechanical story.
• Significant trauma, or minor trauma in a patient at fracture risk (osteoporosis, long-term steroids).

How to train the reflex

Build the red-flag screen into every practice encounter — ask the can't-miss questions even when the case turns out benign, so it becomes automatic. Then, on the case that is hiding an emergency, you'll already have surfaced it. See how disposition folds into the rest of the score in How Part IV Is Actually Graded, and how to work it into your 14 minutes in Part IV, Station by Station.