Posted Date
Effective Date
Update Type
Reference range changed
CPT Code
85730
Order Code
PTT
REFERENCE RANGE CHANGE
PTT (Activated Partial Thromboplastin Time)
Order Code: PTT
Fee Code: 31106 (CPT: 85730)
LOINC: 14979-9
Effective July 31, 2025, the Coagulation Laboratory will be changing lots of reagents. This will result in reference range and critical value changes for PTT test as follows.
Reference Range: 22.1 – 29.3 seconds
Critical Value:>92.6 seconds