Feedback

Test Code: DDIS Preferred Name D-Dimer

Yes
45 minutes
As required
1 hour
Medicare Item

Test Tubes

ImageSpecimen TypeSpecimen VolumeTube Type
Blood (adult)2.7 mLSodium Citrate 2.7 mL (Solid Pale Blue Top)
Blood (paediatric)1.8 mLSodium Citrate 1.8 mL Paed (Clear/Pale Blue Inner)
Blood (neonatal)1.0 mLSodium Citrate 1.0 mL Neonate (Pale Blue Top)

COLLECTION NOTES

Accurate filling of specimen tube essential.
All collections that include Coagulation testing must be sent to the laboratory in a BLUE specimen bag.
If specimen cannot be sent to testing laboratory immediately, maintain specimen at room temperature. If collected as part of a coagulation profile or studies, samples must be delivered to laboratory within 4 hrs.
Please ask the patient what anticoagulants they are on and the dose, record on request form.

GENERAL NOTES



Because of the D-dimer test's high sensitivity, low specificity and high negative predictive value, the best use of the test is to EXCLUDE VTE and not to CONFIRM it. In a patient with a low clinical probability of having a DVT and a NEGATIVE D-dimer test, the condition can be ruled out with a high degree of certainty. (The same does not necessarily apply for possible pulmonary embolism.) The D-dimer test may remain positive for ~2 weeks after major abdominal surgery; a positive value after 2 weeks may be suggestive of VTE in a patient with symptoms of a DVT or PE

Back to top