| FACTOR XII ACTIVITY ASSAY | Email this article Printer friendly page |
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| Primary Name | Factor XII Assay |
| Synonym | Factor XII Functional Assay |
| Synonym | Hageman Factor Assay |
| Contraction | FXII |
| UAB Procedure Number | 2500540 |
| CPT Code | 85280 |
| Specimen | Collect one (1) blue-stopper tube (3.2% sodium citrate), filled to specified volume. Do not underfill or overfill. |
| Specimen Management | Centrifuge blue-stopper tube within 1 hour of collection, separate plasma and test or quick-freeze at -70°C. |
| Specimen Accepted | Daily including weekends |
| Test Performed | Monday-Friday. |
| Available Stat? | Pathologist's approval required. |
| Description | Congenital factor XII deficiency is present in 1-3 % of individuals and is inherited as an autosomal recessive mutation. Factor XII deficiency accounts for many instances of prolonged activated partial thromboplastin time assays but has no clinical consequence, even in pregnancy or surgery. |
| Reference Interval | 50-150% |
| Critical Value | None |
| Associated With | -- |
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