Laboratory Services
PTT (Partial Thromboplastin Time)
Print this pageUpdated Test Information:
Test Description |
PTT (Partial Thromboplastin Time)
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Synonym(s) |
PTT, APTT |
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Test ID |
PTT
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General Information |
Used to monitor treatments with thrombin inhibitors and during heparin or oral anticoagulant therapy Interference: When monitoring heparin therapy, any release of platelet factor 4 (PF4) which is a potent inhibitor of heparin, represents a major source of error |
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Specimen Type |
Plasma |
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Specimen Requirements |
Light Blue |
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Specimen Collection / Processing Instructions |
Light Blue - Centrifuge immediately, transfer plasma to aliquot tube and freeze at less than -20°C. |
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Minimum Sample Volume |
The sodium citrate collection tube must be filled to 90% of capacity. |
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Pediatric Min. Volume (if applicable) |
The sodium citrate collection tube must be filled to 90% of capacity. |
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Additional Processing Details |
If specimen will be received >4 hours after collection, centrifuge for 15 minutes at 2000-2500g. Transfer the plasma to an aliquot tube and store frozen at ≤ -20°C. DO NOT store plasma at 2° - 8°C |
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Stability |
Plasma Na Citrate Unspun Whole Blood in Na Citrate |
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Unacceptable Specimen Conditions |
Refrigerated specimen; Quantity not sufficent; improperly labeled specimens; specimens not collected in 3.2% buffered sodium citrate tube; clotted specimens; under or over filled specimen tubes; severe hemolysis; improperly labeled specimens |
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Methodology |
Automated |
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Estimated TAT |
0-2 days |
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Testing Schedule |
Monday-Saturday, & STAT |
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CPT Code(s) |
85730 |
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Reference Range |
25.1-38.9 seconds |
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Reflex Conditions |
None |
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Performing Lab |
Incyte Diagnostics |
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LOINC Code(s) |
14979-9 |