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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Factor VII Antigen
Test Code59904
CPT Codes
85230<br /> Limited Access Code
Preferred Specimen
1 mL plasma collected from 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.5 mL
Instructions
Citrated plasma samples should be collected by double centrifugation. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate. Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio. The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples, except when using a winged blood collection device (ie, "butterfly"), in which case a discard tube should be used. When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternate anticoagulant should be collected after the blue-top tube.
Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube. Transfer the plasma into a LabCorp PP transpak frozen purple tube with screw cap (LabCorp: 49482). Freeze immediately and maintain frozen until tested.
Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube. Transfer the plasma into a LabCorp PP transpak frozen purple tube with screw cap (LabCorp: 49482). Freeze immediately and maintain frozen until tested.
Transport Container
LabCorp PP transpak frozen purple tube with screw-cap (LabCorp: 49482)
Transport Temperature
Frozen
Specimen Stability
Room temperature: 8 hours
Refrigerated: Unacceptable
Frozen: 1 year
Refrigerated: Unacceptable
Frozen: 1 year
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Lipemia • Thawing
Methodology
Enzyme Linked Immunosorbent Assay (ELISA)
FDA Status
Results of this test are for research purposes only per the assay manufacturer. The performance characteristics of this assay have not been established. The result should not be used as a diagnostic procedure without confirmation of the diagnosis by another medically established diagnostic product or procedure.
Setup Schedule
Set up: Varies; Report available: 2-4 days
Reference Range
| Age | Reference Range |
| 0-3 days: | Not established |
| 4 days - 6 months: | 31-111 |
| 7 months - Adult: | 60-175 |
Clinical Significance
Measurement of factor VII antigen concentration
