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Laboratory Test Reference Guide

Laboratory Information

Test Name



d dimer

External Price (excl. GST)


Specimen Collection

Patient Specimen

Waikato and Thames - 2.7 mL sodium citrate tube (light blue)

Paediatric Specimen

1.8 mL paediatric sodium citrate tube (light blue)

Minimum Volume

500uL platelet poor plasma

Test Information



Test Availability

Mon - Sun, 24hrs

Laboratory Testing Time

1 hour


Innovance D-Dimer (Waikato), AQT D-Dimer (Taumarunui, Te Kuiti, Tokoroa). Reported as Fibrinogen Equivalent Units (FEU)

Reference Interval

DDimer cut off values

Age D-Dimer cut-off values
<50 years <500
>50 years Age x 10

Diagnostic Use Or Instructions

Laboratory Testing Guidelines recommendation:

D-dimer has limited specificity and will be positive in many hospitalised patients without VTE.

We recommend that testing should be restricted to those patients with a high enough clinical suspicion of VTE to merit further investigation, not to rule out the remote possibility of VTE:

Do a D-dimer only in patients with low to intermediate probability VTE (DVT/PE) where there is a high enough suspicion to justify further investigation for VTE by imaging.

Do not do a D-dimer in post-operative patients.

Electronic Information

Registration Code


HL7Mapping Code