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HelpTest Code FACTOR 11 Factor 11 Assay
Clinical System Name
Factor 11 Assay
Synonyms
Factor 11 Activity
Factor XI Activity
Sample Requirements
Specimen: Whole Blood
Container(s): Lt. Blue/Citrate
Preferred Vol: (1) 2.7 mL
Minimum Vol: (1) 1.8 mL
Note: Preferred method of collection is venipuncture with vacuum fill. Test results are affected by incorrect blood volume. Use of a Vascular Access Device for the collection of coag testing is not recommended.
If this method is used it requires a 5 cc clearing volume; 3 cc for size 2 French catheter or smaller. Blood must be trasferred to the Lt Blue/Citrate tube by use of a blood transfer device to ensure proper fill.
Specimen should be processed within one hour of collection.
Processing Instructions
Deliver blood to Core Coag bench. Coag Technologist will process.
Reject due to: Clotted, hemolyzed, insufficient quantity, or improper collection.
Spin: Y
Aliquot: Y
Temp: -70 C
Storage Location: CPA 2 Freezer ( -70 C) Send Out rack.
Specimen should be centrifuged within one hour of collection. Transfer upper 3/4 layer of plasma to plastic tube affixed with large Epic aliquot label. Freeze one aliquot of plasma at -70 C. Preferred plasma volume: 1.0 mL, minimum plasma volume: 0.6 mL. Do not pool.
Off-site collection: Preferred method of collection is venipuncture with vacuum fill. Test results are affected by incorrect blood volumel. Use of a Vascular Access Device for the collection of coag testing is not recommended. If this method is used it requires a 5 cc clearing volume; 3 cc for size 2 French catheter or smaller. Blood must be trasferred to the Lt Blue/Citrate tube by use of the blood transfer device.
Specimen should be centrifuged within one hour of collection. Transfer upper 3/4 layer of plasma to plastic tube affixed with large Epic aliquot label. Freeze one aliquot of plasma at -70 C. Preferred plasma volume: 1.0 mL, minimum plasma volume: 0.6 mL. Do not pool.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Room temp | N | |
| Refrigerated | N | |
| Frozen | Y |
Availability
| STAT | Performed | TAT |
|---|---|---|
| Yes, M - F 8 am - 3 pm. | Drawn daily, Performed M - F at HMC Coag Lab | 1 - 3 d |
Performing Laboratory
University of Washington
Dept. of Laboratory Medicine
Harborview Medical Center Coag Lab
1959 NE Pacific St, NW220
Seattle, WA 98195
Phone Number: (206) 520-4600
Department
Department: Send Outs
Phone Number: (206) 987-2563
CPT Codes
85270
Methodology
Method: Stago STA Clottable Factor assay
Analytical Volume: 1.0 mL citrate plasma
Limitations:
Reference Range
| 0 - 1 month | 23 - 150% |
| 1 - 3 months | 27 - 150% |
| 3 - 6 months | 41 - 150% |
| 6m - 1 year | 38 - 150% |
| > 1 year | 50 - 150% |
Send Out Instructions
| Reference Test Name: | Factor XI (11) Activity Assay |
| Reference Test Number: | F11 |
| Instructions: | Send routines M - F with the UW courier. |