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Test Code FIX Factor IX Assay

Laboratory Code

LAB308

Specimen Requirements

Submit only one of the following specimens


Specimen Type: Whole Blood
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Volume: 2 × 2.7 mL whole blood (Tubes must be full)
Collection Instructions: Send whole blood specimens to laboratory immediately.


Specimen Type: Platelet Poor Plasma
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Submisson Container/Tube: Plastic Vial

Minimum Volume: 1.0 mL plasma
Collection Instructions:
1. Light blue top tube must be properly filled with whole blood.

2. Whole blood specimen should be double centrifuged and plasma separated from cells within 1 hr of collection.
3. Plasma should be separated into 2 aliquots with minimum volume of 1.0 mL each.
4. Freeze the aliquots in well-closed plastic tubes immediately.

Specimen Stability

Specimen Type Plasma
Ambient 4 hours
Refrigerate Not available
Frozen 14 days

Panel Information

Panel includes the following tests:

Methodology

Activated Partial Thromboplastin Clot-Based Assay

Days and Times Performed

Tuesday through Friday, TAT 10 working days

Specimen Condition

Haemolysis Gross reject
Icterus Gross reject
Lipaemia Gross reject
Others Clotted or insufficient reject

Reference Interval

68 – 163 %

Testing Laboratory

National University Hospital
Haematology, 67725320

Service Code

12501

LOINC Code Information

APTT 14979-9
FACTOR IX 3187-2
APTT(1+1) CORRECTION 5946-9
CONTROL PLASMA 13488-2

 

Alias

Factor IX Activity

Update

Last updated 20/03/2025

Reflex Tests

  • APTT mixing study if APTT is > 37.0 seconds