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Test Code: TCT Preferred Name Thrombin time

Results Avail After Hours:Yes

Urgent:45mins

Test Frequency:As required

Routine:2 hrs

MBS Status:Medicare Item

Min. Re-Test Interval:

Public price:

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Test Tubes

Specimen Type	Specimen Volume	Tube Type
Blood (Adult)	2.7mL	Sodium Citrate 2.7 mL (Solid Pale Blue Top)
Blood (paediatric)	1.8 ml	Sodium Citrate 1.8 mL Paed (Clear/Pale Blue Inner)
Blood (Neonatal)	1.0 ml	Sodium Citrate 1.0 mL Neonate (Pale Blue Top)

COLLECTION NOTES

Accurate filling of specimen tube is essential.
All collections that include Coagulation testing must be sent to the laboratory in a BLUE specimen bag.
Please ask the patient what anticoagulants they are on and the dose, record on request form.

GENERAL NOTES

Heparin interferes with the thrombin-fibrinogen reaction and nearly always causes extreme prolongation of the TT. Dabigatran etexilate therapy will also markedly prolong the Thrombin time. Other causes of a prolonged TT are: hypofibrinogenaemia, DIC, liver disease, dysfibrinogenaemia (physiologically present in neonates), and hypoalbuminaemia. A gross elevation of plasma fibrinogen concentration may also prolong the TT!