Service 4

Detection Engine

Three-zone CVD classifier

Version

2026.03.4

Retrained

2026-02-18

Status

healthy

Performance

Key metrics

Calibration & discrimination against the engine's published target. Under-target values are highlighted.

AUC

0.877target 0.850

Calibration (ECE)

0.032target 0.050

Sensitivity (positive)

78.0%target 75%

Specificity (negative)

91.0%target 88%

14-day inference volume

1,042 in the last 24h · avg latency 38 ms

Metrics are tracked on held-out evaluation cohorts; values here reflect the last retrain.

Model

Training basis & runtime

Transparent about what the engine was trained on and how it behaves in production.

Model family

Gradient-boosted ensemble · 15 features

Trained on

115,489 patients

Features in basis

Positive threshold

0.72

Negative threshold

0.18

Active cohort

2,841

History

Changelog

Each retrain is documented; clinicians can see what changed and when.

2026.03.42026-02-18
Retrained with additional gray-zone labels; negative recall +3 pp.
2025.11.02025-11-02
Calibrated separately by age strata ≤60 / 60–75 / ≥75.

Safety

Guardrails

Hard limits and runtime checks the engine enforces.

Never auto-escalates — returns zone, not action.
Gray-zone volume monitored; alerts on >12% drift week-on-week.
Every classification surfaces its top 8 contributing features.

Observability

Recent incidents & retrains

Automatic monitoring — warn / critical thresholds on calibration, drift, and latency.

Gray-zone volume drift +9%warnDetection Engine15/04/2026, 22:40
Week-on-week gray-zone share increased 51→56%. Under automatic monitoring — no action required yet.

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