Click here for more information about laboratory operations and procedures
If you have additional questions regarding this test, please call: 415-353-1667
Factor 5 Activity
|Test group||Coagulation Factor Activities|
|Performed by||Parnassus Hematology|
|In House Availability||Test run 0800-1500 Monday-Friday|
|Method||Clotting assay (Stago - STAR)|
|Collection Instructions||1. Check the expiration date on the label of the blue top vacutainer before drawing the patient.
2. For blood collection in a sodium citrate blue top, the tube must be filled to above the Minimum Fill Indicator on the tube. It is crucial to wait and allow the tube to stop filling before removing it from the needle.
3. With use of a butterfly needle, draw about 1 cc using a separate blue top to remove air from tubing, discard the first tube and then draw a second blue top tube filled to the full extent of the vacuum.
4. Tubes should not be filled past the Maximum Fill dashed line by either using a syringe or removing the tube cap.
Deliver immediately to the laboratory.
For patients with Hct's ≥ 55% please contact Hematology (x3-1747) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
|Container type||Blue top filled to full extent of vacuum|
|Amount to Collect||2.7 mL blood|
|Sample type||Citrated plasma|
|Preferred volume||1 mL plasma|
|Min. Volume||0.5 mL plasma|
|UCSF Rejection Criteria||Samples collected in outdated blue top vacutainer. Over-filled or under-filled tubes may be rejected|
|Processing notes||Provide sample(s) to Hematology section asap.|
UCSF HAS NOT ESTABLISHED NORMAL REFERENCE RANGES FOR FACTOR LEVELS FOR CHILDREN <18 YEARS OLD. The table above gives age-adjusted reference ranges for Pediatric Factor 5 Levels as percentages. The values are expressed by the upper and lower boundary encompassing 95% of the population.
These values are based upon these references:
Andrew M, et al. Maturation of the Hemostatic System During Childhood. Blood October 1992, 80(8): 1998-2005
Andrew M. et al. Development of the Human Coagulation System in the Full Term Infant. Blood 1987 70:165
Values are converted from the original tables, which express values as units/mL. Original tables provide values for infants at 1 day, 5 days, 30 days, 90 days, and 180 days of ages as well as for children 1-5 year, 6-10 years, and 11 - 16 years. The published tables have been converted to the reference range shown.
|Synonyms||F5; FV; Factor V|
|Stability||Factor assays should generally be performed within four hours of specimen collection or the plasma frozen; the latter is stable for 2 weeks at -20C or 6 months at -70C.|
|Turn around times||1-3 days|
|Additional information||If unusual findings are noted a pathologist review and interpretation may be performed and separately billed for|
|Last Updated||4/1/2014 11:41:39 AM|