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HelpTest Code AT3 Antithrombin III
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 x 2.7mL 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)
Submission Container/Tube: Plastic Vial
Minimum Volume: 1.0mL 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 hour of collection.
3. Plasma should be separated into 2 aliquots with minimum volume of 1mL each.
4. Freeze the aliquots in well-closed plastic tubes immediately.
Reference Interval
80 - 111 %
Days and Times Performed
Thursday, TAT 20 working days
Methodology
Chromogenic Assay
Service Code
12408
Update
Last updated 18/05/2022
Unacceptable Condition
| Haemolysis | Gross reject |
|---|---|
| Icterus | Gross reject |
| Lipaemic | Gross reject |
| Others | Clotted or insufficient reject |
Specimen Stability
**Preferred temperatures for storage prior to and during shipping to NUH**
| Specimen Type | Plasma |
|---|---|
| Ambient | 4 hours |
| Refrigerate | 4 hours |
| Frozen | 14 days |
Testing Laboratory
National University Hospital
Haematology, 67725320
Useful For
Investigation of inherited and acquired thrombotic tendency.
Alias
Antithrombin
AT