29 January 2025
: Case report 
Impact of Lupus Anticoagulant on INR Using Recombinant Prothrombin Time Reagent
Unusual clinical course, Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Clinical situation which can not be reproduced for ethical reasons
Fatmawati Kamal
ABCDEF 1*, Halimatun Radziah Othman ABCDEF 2
DOI: 10.12659/AJCR.945579
Am J Case Rep 2025; 26:e945579
Table 3. PT results using different analyzers and reagents on 9/2/2022.
| Location | Our laboratory | Reference laboratory | ||
|---|---|---|---|---|
| Coagulation analyzer | Sysmex CS-2500 | Sysmex CA-104 | Werfen ACL Top 550 CTS | |
| PT Reagent | Siemens Dade Innovin | Werfen HemosIL RecombiPlasTin 2G assay | ||
| PT (sec) | Patient’s result | 40.5 | 56 | 13.4 |
| Reference range | 9.3–10.8 | 7.9–10.3* | 10.3–12.7 | |
| * Manufacturer ranges. | ||||