# AI指示护士在24小时而非要求的48-72小时读取结核菌素皮肤试验（TST）结果，导致假阴性结果

- **ID:** `medical/tuberculin-skin-test-timing`
- **领域:** medical
- **类别:** protocol_error
- **错误码:** `TST-TIMING-ERR-04`
- **验证级别:** ai_generated
- **修复率:** 92%

## 根因

AI输出'24小时后读取TST'，基于对CDC指南的误解；指南要求48-72小时后读取；过早读取会遗漏迟发型超敏反应，导致假阴性。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| CDC TB Guidelines 2023 | active | — | — |
| Epic Stork v2024.1 | active | — | — |
| QuantiFERON-TB Gold Plus v2.0 | active | — | — |

## 解决方案

1. ```
   Document the invalid TST (read at 24h) as 'uninterpretable' in the EHR. Order a new TST and schedule a return visit at 48-72 hours. Provide patient with written instructions: 'Do not read the test yourself; return to clinic exactly 48-72 hours after placement.'
   ```
2. ```
   If the patient cannot return, switch to IGRA (QuantiFERON-TB Gold Plus) as a single-visit alternative. Order in EHR: 'IGRA for LTBI screening, reason: TST reading window missed.'
   ```
3. ```
   Implement a hard stop in the nursing documentation system: if TST reading time is <48 hours, block finalization and display: 'TST reading invalid: must be 48-72 hours after placement. Re-enter time or order repeat test.'
   ```

## 无效尝试

- **** — The test must be read within the 48-72 hour window; a 24-hour reading is invalid and cannot be 'corrected' by a later reading because the induration may have already peaked and subsided. (80% 失败率)
- **** — Chest X-ray is not a substitute for TST; it detects active disease, not latent infection. A negative X-ray does not rule out latent TB. (75% 失败率)
- **** — IGRA is an alternative, but the invalid TST should be documented and the patient informed; IGRA may not be covered by insurance if TST was already performed. (60% 失败率)