Abstract Background Most laboratories and hospital patient safety committee define the critical value parameter together, and laboratory should notice the doctor when critical value reporting. “Critical value” as a result refers to the patient may be life-threatening or in imminent danger and require immediate treatment by a doctor. Especially, Troponin-I result is greatly affect door to balloon time. As soon as the critical value reporting, the patient will get therapy earlier. For patient safety, we implemented some methods to reduce the turnaround time of critical value reporting. Methods (1) Shorten the distance between specimen receiver and testing operator from 2 meter to 0 meter. Specimens are analyzed sooner due to reduced unnecessary walk. (2) Assess the difference of results between first and second exam, there are no significant difference. Reducing unnecessary repeat test to report critical value as soon as possible. (3) Reading barcode by both clockwise and counterclockwise way to improve barcode reading performance of analyzer, and reducing unnecessary re-label or manual operate. Results Emergency patient critical value report in 30 min completion rate increased from 80.5% to 93.3%. Inpatient critical value report in 60 min completion rate increased from 94.1% to 96.6%. Troponin-I report in 30 min completion rate increased from 89.3% to 97.0%. Conclusion Doctors treat according to result from laboratory, and delayed report is an impediment to patient care. Particularly critical value reports, that causes delays in urgent patient treatment. We reduced unnecessary work to short turnaround time for critical value reporting, patient will get better therapy faster, and further improve patient safety.