Test Directory

Clear All
Test Code
XII
Test Name
Factor XII Activity
CPT Codes
85280
Expected Turnaround Time
1 - 2 day
Specimen and Container Info

Specimen Type: Citrated Platelet-Poor Plasma

  

Collection Container: Light Blue Top (Sodium Citrate)

Desired Specimen Volume: 1.5 mL
Collection Instructions
  1. Collect 2 light blue top (sodium citrate) tubes via venipuncture.
Processing and Submission Instructions

Platelet-Poor Plasma Processing Instructions

  1. Separate plasma from cells within 4 hours of collection.
  2. Perform platelet-poor plasma procedure.
  3. Transfer 1.5 mL of platelet poor plasma to clear aliquot tube (screw cap). Freeze immediately.
Transport Instructions

Transport to the laboratory frozen.

Stability Requirements

Room Temperature

4 hours (whole blood)

Frozen

platelet poor plasma: 14 days at -20°C or 6 months at -70°C
Causes for Rejection
  • Clotted or under filled tubes
  • Excessive hemolysis, icterus, or lipemia
  • Specimens over 4 hours old at room temperature
Methodology
One-stage clotting assay (optical)
Reference Intervals

See patient report.

Alternate Names
Reference Lab
TJUH Center City
Testing Schedule
Monday-Friday
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
© 2026 HNL Lab Medicine. All rights reserved.