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Prolonged PT Evaluation [19643X]
Test Code18180
CPT Codes
85610
Includes
Prothrombin Time with INR
If Prothrombin Time with INR, is minimally prolonged (12-14 sec), then Minimally Prolonged PT Profile, will be performed at an additional charge.
If Prothrombin Time with INR, is prolonged (> 14 sec), then PT 1:1 Mixing Study Profile, Progressive, will be performed at an additional charge.
Additional assays, if needed, will be performed at an additional charge to determine the cause of the abnormality.
If Prothrombin Time with INR, is minimally prolonged (12-14 sec), then Minimally Prolonged PT Profile, will be performed at an additional charge.
If Prothrombin Time with INR, is prolonged (> 14 sec), then PT 1:1 Mixing Study Profile, Progressive, will be performed at an additional charge.
Additional assays, if needed, will be performed at an additional charge to determine the cause of the abnormality.
Preferred Specimen
1 mL (x4) platelet-poor citrated plasma collected in 3.2% sodium citrate (light blue-top) tubes
Minimum Volume
1 mL (x4)
Instructions
4 mL frozen citrated platelet-poor plasma.
Submit 4 plasma aliquots, each with 1 mL plasma for possible additional testing.
Submit 4 plasma aliquots, each with 1 mL plasma for possible additional testing.
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 14 days
Refrigerated: Unacceptable
Frozen: 14 days
Methodology
Photo/Optical (P/O)
Setup Schedule
Set up: Mon-Sat; Report available: Next day
Reference Range
See Laboratory Report
Clinical Significance
The investigation of a prolonged Prothrombin Time will
depend on the extent of prolongation. The investigation
follows a testing algorithm with an endpoint of arriving
at a final diagnosis, most commonly a vitamin K
deficiency, anticoagulant therapy, specific factor
deficiency, or an inhibitor of coagulation.
depend on the extent of prolongation. The investigation
follows a testing algorithm with an endpoint of arriving
at a final diagnosis, most commonly a vitamin K
deficiency, anticoagulant therapy, specific factor
deficiency, or an inhibitor of coagulation.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153
