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HelpTest Code PINR Prothrombin Time And INR
Specimen Type
Blood.
Preferred Collection Container
BLUEAcceptable Collection Container
BLUE (3.2% buffered sodium citrate)
Collection Instructions
Routine venipuncture. If multiple tests are being drawn, draw coagulation studies last. If only coagulation studies are being drawn, draw 1-2 mL into another Vacutainer, discard and then collect coagulation specimen. This collection procedure avoids contamination of the specimen with tissue thromboplastins. A special tube should be obtained from the laboratory for hematocrits over 55%. Specimens should be transported as soon as possible to the Clinical Laboratory.
Collection Volume
2.7 mL in 2.7 mL tube
Minimum Collection Volume
1.8 mL in 1.8 mL tube
Rejection Criteria
Specimens that are clotted, hemolyzed, diluted with IV fluid, received more than 24 hours after collection, insufficient volume. Samples that were frozen and thawed during transport.
Specimen Storage and Stability
For testing delayed longer than 24 hours- centrifuge sample for 15 mins at 1500g and separate plasma. Transfer once-centrifuged, citrate plasma into a plastic tube. Sample should be frozen in a frost-free -20 C freezer. Sample must remain frozen until testing is performed.
Day(s) and Time(s) Performed
Monday through Sunday, 24 hours
EPIC Code
LAB320
STAT Availability
YES
Turn Around Time
Routine Acute Care- 8 hours; STAT Acute Care – 40 minutes; Routine Outpatient: 1 day/Same day
Lab Department
Hematology
Alias
Protime; PT; Prothrombin Time; Protime and INR; INR;