21st November 2023 | Collection & Request Instructions | Prothrombin activity is expressed as the International Normalised Ratio (INR).
Specimens cannot be analysed or re-analysed greater than 8 hours after collection. | Prothrombin activity is expressed as the International Normalised Ratio (INR) and Prothrombin time (Sec)
Specimens cannot be analysed or re-analysed greater than 8 hours after collection. |