# SmearLens

- **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon)
- **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST)
- **Where:** Online
- **Team:** [Ravenne Leopold](https://cerebralvalley.ai/u/Ravenne)
- **GitHub:** https://github.com/Ravriely/smearlens
- **Demo video:** https://youtu.be/hl8irhvUt3s
- **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2390

SmearLens is a review assistant for peripheral blood smears, for lab biologists. Reading a smear means looking at about a hundred white cells by eye, one by one, most of them unremarkable. SmearLens does the first pass, so the biologist can spend their time on the cells that need a closer look.

It is a lab workflow tool, not a diagnostic device: it never gives a diagnosis or medical advice, and every count is a draft that a biologist reviews and validates.

From one field of view or up to 20 fields of a slide, it returns:
- every white cell with its type and confidence, among 8 types plus "suspected blast";
- red cell and platelet counts;
- a differential count;
- a review queue: suspected blasts first, then cells below a calibrated 92 % confidence cutoff;
- a slide report written by an agent, with the cells to open first and its limits.

Results, all measured and documented in 19 public experiments:
- 97.6 % right type on PBC test cells, against 65 % for zero-shot Muse Spark;
- checking the 10 % least sure cells leaves 0.3 % errors;
- 83.7 % on a lab in Munich the probe never saw, without retraining;
- 97 % of Munich test blasts flagged first, with 88 % of the flags right and none on 2,560 normal PBC cells. This recall is optimistic: the blasts come from one lab and the split has no patient ID.

Known weak spots are stated too: pale white cells on BCDD images, and red cells undercounted on crowded fields. It has only been tested on public datasets, never in a clinical setting.

Live demo: https://ravriely--smearlens-app-web.us-east.modal.run
The page opens on a recorded run that needs no GPU. To run it live, click "Access token", paste the token below, then "Slide · 20 fields" and "Run it live". The first request after a pause takes about 45 s while the GPU starts.
Access token: FtSbVKl9Vaj43Mtmc3HV2d-JsGN3SGpn

## More from Meta Global AI Developer Hackathon

- [Uplink](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2387)
- [StatWise Innovators](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2388)
- [ReproTrace AI](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2389)
- [ByteHive Supervisor](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2391)
- [void catalyst](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2392)
- [Arosa](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/2393)

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