From Kim Kinney at Clarian:
I got a call from an area lab that is having some issues with INRs. These are all being drawn in BD 2.7 mL plastic tubes. They are getting large discrepancies in INRs after an initial spin. They got a call from an ambulatory area questioning a 4.23 INR. When they spun the sample again and repeated the INR was 1.63. They had the patient redrawn and the INR was 1.6. This has happened several times. It always starts elevated and re-spinning brings it down They are switching to glass tubes. They have done all sorts of studies, turning up nothing. They are now double spinning everything. Have you heard of anything with plastic tubes?
Hi, Kim. The UAB lab has used 2.7 mL BD blue-closure tubes for years with no problems. I’d like to learn what others have seen.