Factor 11 Activity
| Abbrev Code: | F11 | ||
| Order Code: | LAB309 | Order Name: | Factor 11 Assay |
| Synonyms: | Anti-Hemophilic Factor C; Plasma Thromboplastin Antecedent; Factor XI Activity | ||
| Methodology: | APTT clotting time correction of factor 11 deficient plasma. Patient dilutions are compared to a known set of standard dilutions and a percentage is determined. | ||
| CPT Codes: | 85270 x1 | ||
| Turnaround Time: | Turnaround time is 4-8 hours if received during lab hours (see Associated Link). With pre-notification, stats are done within 1 hr after receipt in the laboratory. | ||
| Associated Links: | Specimen Collection and Processing for Coagulation Specimens |
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Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.7 mL (in 3 mL tube) - filled to fill line on the tube. |
| Minimum\Peds Volume: | 1.8 mL (in 2 mL tube) - filled to fill line on the tube. |
| Container: | Blue Na Citrate, 3.2% - fill to fill line on tube |
| Collection Instructions: | See link to Specimen Collection and Processing for Coagulation Specimens. |
| Causes for Rejection: | Underfilled tube or clotted specimens. |
Processing and Shipping
| Specimen Processing: | See link to Specimen Collection and Processing for Coagulation Specimens. |
| Shipping Instructions: | See link to Specimen Collection and Processing for Coagulation Specimens. |
| Test Performed at or Referral Lab | Special Coagulation (UMMC East Bank) |
Interpretive
| Critical Range: | Less than 10% | ||||||||||||||
| Reference Range: |
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| Use: | Factor 11 is an intrinsic coagulation pathway factor. A deficiency may cause bleeding of variable severity (usually mucous membrane or post surgical). |
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