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Lab Dept:
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Coagulation
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Test Name:
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FACTOR II (FAIRVIEW UNIVERSITY)
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General Information
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Lab Order Codes:
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F2U
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Synonyms:
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Prothrombin Assay; Factor II Assay
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CPT Codes:
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85210 – Clotting; factor 2, prothrombin, specific
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Test Includes:
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Factor II activity reported as a %.
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Logistics
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Test Indications:
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Useful for the detection of a single factor congenital homozygous or heterozygous deficiency or acquired due to Vitamin K deficiency, liver disease or cystic fibrosis.
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Lab Testing Section:
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Coagulation - Sendouts
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Referred to:
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Fairview University Medical Center (Test# F2)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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4 hours if received on Monday – Friday: 0700-1730 or Saturday: 1000-1300. 1 day if received outside of these regular working hours. Stats are done within 1 hour of receipt in the laboratory.
For urgent testing after hours, contact Children’s laboratory and they will call Fairview’s tech on call.
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Special Instructions:
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Patient should not be receiving Coumadin® or heparin. If so, this should be noted on the request form. Heparin or warfarin therapy can affect certain coagulation factors or assays, preclude their performance, or cause spurious results. Indicate when specimen is drawn from a line or a heparin lock. Deliver immediately to the laboratory.
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Light Blue top tube (Buffered Na Citrate 3.2%)
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Draw Volume:
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2.7 mL blood in a 3 mL tube, Minimum: 1.8 mL blood in a 2 mL tube. Respect fill line on the collection tube.
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Processed Volume:
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Specimen will be processed by the reference lab facility.
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Collection:
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Routine venipuncture. Do Not use the first 2mL of blood collected.
Patients with Hematocrit levels of >55% must have a special tube made to adjust for the hematocrit, contact laboratory for special tube. Fill tube completely. Mix thoroughly by gentle inversion.
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Special Processing:
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Lab Staff: Do Not centrifuge. Send to reference lab in original Vacutainer® at room temperature. Specimen must arrive within 24 hours of collection.
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Patient Preparation:
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If the patient has a coagulation abnormality, apply direct pressure to the puncture site for 10 minutes; apply pressure dressing. Instruct the patient to leave the bandage on for 12 hours.
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Sample Rejection:
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Improper tube; clotted samples; underfilled tubes; overfilled tubes; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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Age:
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Range (%)
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Less than 1 day:
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28 – 78%
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0 – 4 days:
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37 – 59%
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5 – 29 days:
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48 – 78%
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30 – 89 days:
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51 – 85%
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90 – 179 days:
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60 – 90%
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180 – 364 days:
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74 – 102%
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>1 year:
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60 - 140%
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Critical Values:
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N/A
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Limitations:
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Interpretation of results may be limited if patient is receiving anticoagulant therapy or if test is done more than 2 hours after collection.
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Methodology:
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Thromboplastin clotting time correction of Factor 2 deficient plasma. Patient dilutions are compared to a known set of standard dilutions and a percentage is determined.
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References:
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Fairview University Web Page June 2011
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Harmening DH (1997) Clinical Hematology and Fundamentals of Hemostasis
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Updates:
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5/27/2004: Reference range changed from 70 – 130% to 60 – 140%. Draw volume adjusted from 4.5 mL in a 5 mL tube to 2.7 mL in a 3.0 mL tube.
10/7/2005: Reference ranges added for 0-5 days, previously only listed for greater than or equal to 1 year.
5/25/2010: Tubing patient specimens is no longer prohibited.
6/15/2011: Reference range changes.
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