Waikato and Thames - 2.7 mL sodium citrate tube (light blue)
1.8 mL paediatric sodium citrate tube (light blue)
500uL platelet poor plasma
Mon - Sun, 24hrs
Innovance D-Dimer (Waikato), AQT D-Dimer (Taumarunui, Te Kuiti, Tokoroa). Reported as Fibrinogen Equivalent Units (FEU)
DDimer cut off values
|Age||D-Dimer cut-off values|
|>50 years||Age x 10|
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.