Effective December 6, 2021, Spectrum Health Reference Laboratory (SHRL) Coagulation department will go live with a new lot of Prothrombin Time (Protime/PT) reagents. The reference range for the PT will be adjusted to reflect this reagent lot change and align with our Regional Laboratories. The new reference range will be 9.5 – 12.0 seconds. There will be no change to the INR ranges.
| Test | Current Reference Range | New Reference Range |
| Prothrombin Time (PT) | 9.7 – 12.6 seconds | 9.5 – 12.0 seconds |
For questions or additional information, please use the contact us link above.
Test Information
PT/INR [LAB320] | Interface code: 10059 | CPT code: 85610
