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 XI Activity

Test Code
FAC11


Alias/See Also
Epic: LAB309


Preferred Specimen

Specimen Type: Platelet poor plasma
Collection Container: Light-blue top (3.2% sodium citrate)
Specimen Volume: 1 mL




Minimum Volume

0.5 mL




Instructions
  1. Draw blood into a light blue (sodium citrate) tube.  Be sure to fill tubes completely.
  2. Mix gently 5 to 6 times (do not over mix).
  3. Centrifuge the sample for 10 minutes.
  4. Using a pipette, aliquot plasma into a plastic vial being careful not disturb the buffy coat.
  5. Centrifuge the plasma sample a second time for 10 minutes
  6. Using a pipette, aliquot the top portion of plasma into a plastic vial.  Be careful not to disturb the sediment at the bottom (leave approx. 0.25 mL of plasma at the bottom).
  7. Label each tube as "Plasma."
  8. Immediately freeze samples
 For complete instructions, see Platelet Poor Plasma Instructions.


Transport Container
Plastic vial


Specimen Stability

Plasma
Room temperature: 4 hours
Refrigerated: Unacceptable
Frozen: 1 month

Whole Blood
Room temperature: 4 hours
Refrigerated: Unacceptable
Frozen: Unacceptable




Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Unacceptable Specimens: Samples that are short draws, clotted or have excessive hemolysis, icterus or lipemia should not be used, as they may yield incorrect results.




Setup Schedule

Monday - Friday, AM




Report Available

1 day




Reference Range
76 - 157 %


Performing Laboratory

Inova Laboratories

2832 Juniper Street

Fairfax, VA 22031




Last Updated: April 10, 2023
Last Review: N. Wolford, April 10, 2023


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.