Department: Haematology
Alternate Names for Test: DD
Specimen Collection Requirements:
Phlebotomist Instructions: All D-Dimers are handled as urgent specimens. If requester has stated that the D-
Dimer test is urgent then phlebotomy team leader must be contacted by phone (no 
voice messages) so specimen can be handled as a critical specimen & immediate 
transportation arranged.

Sample Type:

1x Blue (Sodium Citrate) tube 2.7mL

Minimum Sample Volume: TUBE MUST BE FULL.
Unacceptable Samples: Clotted samples. 
Transport Requirements: Ambient
In the Lab:
Delphic Code: DD
Ultra Code: DDP
Lab Solutions Code: RFDP
Testing Schedule: Analysed daily
Turnaround Time: Daily
Reference Interval & Interpretation: Patient up to 50 years, the reference range will be <500 ng/mL 
Patient 51 years and over, the reference range will be <(patientsí age x 10) e.g. 
if patient is 55 years, the reference range will be <550. 

When used for DVT/PE exclusion, the Innovance D-dimer assay has an age related 
cut-off value and must be used in conjunction with a validated pretest probability 
score (the modified Wells score is recommended). 
It is only useful in patients assigned to the 'low probability' group in whom a 
negative D-dimer essentially excludes DVT or PE. 
An elevated D-dimer result is non-specific: it can occur in DIC, infection, post 
surgery, during normal pregnancy, in malignancy and the cutoff increases with age 
in normal persons.

Stability Time Limit for Add-On Tests: 4 hours
Link to Application and Diagnostic Use Website: https://www.rcpa.edu.au/Library/Practising-Pathology/RCPA-Manual/Items/Pathology-Tests
Contact Details:
Lab Contact: Rebecca O'Toole
Department Name: Haematology
Phone: (04) 3815900
Email: Rebecca.OToole@wellingtonscl.co.nz

Test Information last updated on 06/06/2017
Website last updated on 15/01/2018 07:29

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