Prothrombin Time (PT) / INR

Specimens Requirements:

Patient Preparation:	None
Specimen Type:	Plasma
Container / Tube Type:	Sodium Citrate, Blue Top, 2.7mL
Minimum Volume:	2.7mL
Collection instructions: (Sample Rejections):	Insufficient blood (wrong blood to anticoagulant ratio). Collect a new sample. Specimen clotted. Collect a new sample. Haemolyzed sample should not be analyzed as haemolysis will result in shortened coagulation time. Collect a new sample.

Sample Stability:

Ambient (20 – 25°C):

2 h, or 24 h (after centrifuged and platelet-poor plasma removed)