PT Mixing Studies
Abbrev Code: | PT1T2 | ||
Order Code: | LAB3698 | Order Name: | PT Mixing Studies |
Synonyms: | INR Mixing Study | ||
Methodology: | An INR assay of patient/normal plasma mixture at 1:2 dilution | ||
CPT Codes: | 85610 x1 | ||
Turnaround Time: | Performed and reported 24 hours per day. | ||
Special Instructions: | INR must be elevated for age group for the PT mixing study to be performed. | ||
Associated Links: | Specimen Collection and Processing for Coagulation Specimens |
Collection Instructions
Specimen: | Blood |
Optimal Volume: | 2.7 mL (in 3 mL tube) - filled to fill line on the tube |
Minimum\Peds Volume: | 1.8 mL (in 2 mL tube) - filled to fill line on the tube |
Container: | Blue Na Citrate, 3.2% - fill to fill line on tube |
Collection Instructions: | If the patient's hematocrit is >55%, contact laboratory to obtain a special tube.
If using a butterfly needle, a waste tube must be collected before the blue top. |
After Care: | If the patient has a coagulation abnormality, apply direct pressure to the puncture site for 10 minutes; apply a pressure dressing. Instruct the patient to leave the bandage on for 12 hours. |
Causes for Rejection: | Underfilled tubes, overfilled tubes, clotted specimens, specimens collected in 3.8% buffered citrate, specimen greater than 8 hours old or not processed appropriately within 8 hours after collection, or specimens stored in the refrigerator. |
Processing and Shipping
Specimen Processing: | Send whole blood or platelet poor plasma. See Associated Link for additional processing instructions. |
Shipping Instructions: | Ship whole blood specimens at room temperature. Whole blood specimens must arrive within 8 hours. If greater than 8 hours is required for transport, follow specimen processing instructions and ship frozen plasma on dry ice. |
Test Performed at or Referral Lab | Coagulation (UMMC East Bank) |
Interpretive
Use: | To test for presence of an inhibitor. |
Click HERE to Report test errors or omissions.
*If no email program is associated with this computer, please contact:
systemlabguide@fairview.org for TestID: 3675"