Factor IX, Activity (LAB000674) | ||
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Test Mnemonic: | FACTOR IX
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Specimen Requirements: | ||
Collection: | Routine venipuncture; discard 1st mL of blood by collecting a discard tube prior to collecting the blue-topped (3.2% sodium-citrate) tube. For collections with butterfly blood collection sets, a discard tube should also be collected prior to collection of the blue top to ensure sufficient sample volume. Drawing a discard tube will displace the air from the blood collection set tubing to ensure proper blood draw volume
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Container: | Blue-topped (3.2% sodium-citrate) tube |
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Minimum Volume: | 1 mL of plasma |
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Storage/Transport: |
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Specimen Preparation: |
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Stability: |
If the testing is not completed within 4 hours, platelet-poor plasma should be removed without disturbing the sedimented cells (buff-coat) and frozen at -20oC or below for short-term storage (up to 2 weeks), or -70oC for 6 months.
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Causes for Rejection: |
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Reference Range: | 65 - 150%
Infant and child reference ranges have not yet been established at UTMB. |
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Turnaround Time: |
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Methodology: | Optical Clot-Based
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Performed: | Samples are accepted 24 hours per day at Sample Management, 7.412 CSW Bldg.
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Lab: | Hematopathology |
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Synonyms: | Factor IX Activity, F9, FIX, Factor IX Deficiency or Factor IX Assay |
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Clinical Indication: | Measures level of factor IX that can be useful in diagnosing bleeding disorders and liver disease.
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Patient Preparation : | Patient must not be on any anticoagulation therapy for 48 hours before blood collection.
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CPT 4 Code: | 85250
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Note: | Interfering substances: oral contraceptives, anticoagulant therapy, thrombin inhibitors. The presence of lupus anticoagulants may lead to an under-estimation of the FIX level. |
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When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent. |