Mix PTT Panel
Label Mnemonic: MIX
Epic code: LAB1110
Order form: Laboratory Requisition
Supply order: Supply Order Form
Billing: Billing Policies
CPT code: 85730, 85732, 85384, 85670
Specimen(s):
Collection Medium:
Light Blue top tube 2.7 mL (Na Citrate)
Minimum:
Full draw; 2.7 mL light blue top (mix well).
Rejection Criteria:
QNS, clot, excessive hemolysis
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
2 hours (upon receipt in laboratory)
Reference Range:
PTT = 22-31 sec
MPTT = 22-31 sec
Fibg = 194-488 mg/dL
TT = 17-20 sec

Fibg and TT reference ranges updated on 12/16/2019 due to new assay reagents.
Interpretive Data:
A PTT mix panel is performed to screen for a factor deficiency or inhibitor.
Comments:
A MIX testing panel should have its own draw tube and not be combined with other coagulation tests or panels to ensure an adequate amount of plasma for testing.

Instrumentation changed from BCS-XP to CS-5100 on 12/16/2019.
Methodology:
Optical clot detection.
Sample Processing:
Centrifuge within four hours of draw time.
Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells.
Separate plasma into plastic container and cap (glass is not acceptable).
Centrifuge a second time to ensure platelet poor plasma and separate plasma into a new, labeled plastic tube, cap.
Sample Storage:
Freeze specimen immediately.
Transport Instructions:
Place labeled specimen into zip-lock type biohazard bag; seal bag.
Place requisition into outside pocket of bag.
Place dry ice on top of specimen in Styrofoam container to maintain frozen temperature.
CPT Code:
85730, 85732, 85384, 85670