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Test Code Billings Clinic: 2010 Pre-op Coagulation Panel

Performing Laboratory

Billings Clinic Laboratory: Coagulation, Hematology

Useful For

  • The PT is used to screen for hemostatic disorders involving fibrin formation and to monitor the effectiveness of oral anticoagulant therapy.
  • The APTT is a useful and effective method for screening patients with a bleeding tendency, for evaluating the effect of therapy in procoagulant disorders and as the basis for several specific coagulation factor assay procedures.
  • The platelet count is used to screen for possible conditions that affect the number of platelets in the blood.

Methodology

Protime/INR, APTT - optical

Platelet - Fluorescent optical, hydrodymanic focusing

Specimen Requirements

Sodium Citrate Plasma for APTT and PT

 

Specimen Collection and Handling:

  • Draw blood in a light blue-top (3.2% sodium citrate) tube(s).
  • Immediately after draw, gently invert tube(s) at least 6 times to mix well.
  • Spin down, remove plasma, spin plasma again, and place 1 mL of citrate platelet-poor plasma in plastic vial.
  • Glass vial is not acceptable.
  • Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
  • Freeze specimen immediately at -20° C.
  • Plasma containing Heparin (patients being treated with Heparin) MUST be centrifuged and plasma separated within 1 hour

 

Specimen Transport:

  • Transport specimen frozen
  • DO NOT refrigerate specimen

 

EDTA Whole Blood for Platelet Count

Specimen must arrive within 24 hours of draw.

  • Draw blood in a lavender-top (EDTA) tube(s).
  • Send 5 mL of unprocessed EDTA whole blood refrigerated.
  • Do not centrifuge.
  • Forward unprocessed whole blood promptly.

Reference Values

Reference values are included with the patient's report.

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

85610 - Prothrombin Time

85730 - Thromboplastin time, partial (PTT)

85049 - Platelet, automated

 

LCD or NCD test. ICD-10 code is required for this test. When appropriate, obtain a properly executed ABN and submit the ABN with test order(s). See “Medical Necessity and Advanced Beneficiary Notice (ABN) Policy and Form” under “Resources” for a copy of a form and additional information.

LOINC Code Information

Reporting Name LOINC Code
Protime 5902-2
INR 6301-6
APTT 14979-9
Platelet 777-3

 

Profile/Testing Information

Profile Information:
Protime/INR (PT/INR) Activated Partial Thromboplastin Time (APTT)
Platelet Count  

Reject Due To

  • Clotted specimens
  • Specimens containing small clots, fibrin strands or platelet clumps
  • Gross hemolysis
  • Samples drawn above an IV line
  • Samples kept at room temperature > 24 hours after collection
  • Coagulation specimens received refrigerated