Pathology Which of the following statements are true about estimation of prothrombin time (PT)? A Immediate refrigeration to preserve factor bility B Platelet-rich plasma is essential C Done preferably within 2 hours of collection D Utilises Kaolin 💡 Explanation Which of the following statements are true about estimation of prothrombin time (PT)? ✓ Correct Answer: C. Done preferably within 2 hours of collection