Before You Lock In a Diagnosis, Pause
Turn a first impression into reasoning you can explain, challenge, and revise.
Name the first impression
Write the leading diagnosis and the specific evidence that made it rise to the top.
Find the uncomfortable clue
Identify one important finding the leading diagnosis does not explain well.
Explain the mechanism
Connect the patient’s findings to an underlying biological process instead of restating symptoms.
Force a revision point
Name the result, response, or new finding that would move another diagnosis above the leader.
Use this before you choose.
Do not close the differential until you can name one plausible alternative and one piece of evidence that would separate it from the leader.
Make the guide specific to you.
- What is my leading diagnosis?
- What evidence supports it?
- What finding does it not explain?
- What mechanism connects the major clues?
- What would change the ranking?
Copy the message.
My first impression is [diagnosis]. It fits because [findings]. The clue I cannot ignore is [finding]. A reasonable alternative is [diagnosis]. The mechanism I am considering is [pathophysiology]. I would rerank the differential if [new evidence].