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HelpTest Code TCT Thrombin Clotting Time
Laboratory Code
LAB324
Specimen Requirements
Submit only one of the following specimens
Specimen Type: Whole Blood
Container/Tube: Light Blue Top (3.2% Sodium Citrate)
Volume: 2.7 mL Whole Blood (Tube must be full)
Collection Instructions: Send whole blood specimen to laboratory immediately.
Specimen Type: Platelet Poor Plasma
Container/Tube: Light Blue Top (3.2% Sodium Citrate)
Submission 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 4 hrs of collection
3. Freeze the plasma in well-closed plastic tube immediately.
Specimen Stability
| Specimen Type | Plasma |
|---|---|
| Ambient | 4 hours |
| Refrigerate | Not available |
| Frozen | 14 days (preferred) |
Methodology
Photo-optical Clot Detection
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Gross Haemolysis | Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others: Clotted or insufficient specimen | Reject |
Reference Interval
| Adults | 13.8 – 17.2 seconds |
|---|
Testing Laboratory
National University Hospital
Haematology, 67725320
Useful For
Aids in the detection of presence of heparin.
Aids in the detection of dysfibrinogenaemia and disseminated intravascular coagulopathies.
Service Code
12402
LOINC Code Information
3243-3
Alias
Thrombin Time
TCT
TT
Update
Last updated 21/03/2025