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Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog
FACTOR XII (12) CLOTTING ACTIVITY |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB2260 Geisinger Epic ID: 7132 | |
SPECIMEN COLLECTION |
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Specimen type: |
Platelet-free plasma | |
Preferred collection container: |
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Alternate Collection Container: |
Other size blue-top (3.2% sodium citrate) tubes (e.g., 1.8 mL, 4.5 mL)
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Specimen required: |
1 ml aliquot plasma. | |
Special notes: |
Do not draw blood from a heparinized line. Avoid contaminating the sample with tissue thromboplastin or heparin. Venipuncture must be performed with no trauma. If blood is drawn from an indwelling catheter, flush with 5 mL of saline and discard the first 5 mL of blood collected. | |
Patient preparation: |
None. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Centrifuge the citrated blue-top tubes as soon as possible (within 60 minutes) at designated time and speed to obtain platelet-poor plasma (<10,000/µL). Using a plastic pipette, remove 1 mL of plasma and transfer to a plastic polypropylene aliquot tube and label with patient's name and a second patient identifier (e.g., date of birth, medical record number). Freeze upright and transport on dry ice. | |
Transport temperature: |
Frozen. | |
Specimen stability: |
Frozen: -20°C for 30 days, -70°C for 6 months. Room temperature: 4 hours. | |
Rejection criteria: |
Clotted specimen. Stability limits exceeded. Indications of thaw in transit are sample on slant in aliquot tube or in lid of tube. These samples will be run but will receive a comment of interpret results with caution as thawing suspected. | |
TEST DETAILS |
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Reference interval: |
50-150%. | |
CPT code(s): |
85280 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Factor XII Assay. | |
Methodology: |
Mechanical Clot-Based |
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Synonyms: |
Factor XII Activity, Factor 12, Hageman, XII, FA12, Factor XII Assay
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Clinical significance: |
Factor XII assay is useful in evaluating the reason for a prolonged APTT test. | |
Doctoral Director(s:) |
Michelle Grant DO | |
| Review Date: | 04/29/2019 | |