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Selective D-Dimer Testing Compared With Uniform D-Dimer Testing in the Diagnosis of Deep Vein Thrombosis (SELECT) (SELECT)

This study has been completed.
Heart and Stroke Foundation of Ontario
Information provided by (Responsible Party):
McMaster University Identifier:
First received: September 8, 2005
Last updated: October 25, 2011
Last verified: October 2011
The purpose of this study is to compare two diagnostic interventions to improve the way D-dimer blood testing (MDA D-dimer) is used to diagnose first time symptomatic deep vein thrombosis.

Condition Intervention Phase
Deep Vein Thrombosis
Procedure: D-dimer testing
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Diagnostic
Official Title: Selective D-Dimer Testing Compared With Uniform D-Dimer Testing in the Diagnosis of Deep Vein Thrombosis: A Randomized Trial

Resource links provided by NLM:

Further study details as provided by McMaster University:

Primary Outcome Measures:
  • objectively confirmed proximal deep vein thrombosis or pulmonary embolism during 3 months of follow-up in patients who are not diagnosed with deep vein thrombosis during diagnostic testing and are not anticoagulated [ Time Frame: 3 Months ]

Secondary Outcome Measures:
  • bleeding [ Time Frame: 3 Months ]
  • healthcare utilization [ Time Frame: 3 Months ]
  • cost-effectiveness [ Time Frame: 3 Months ]

Enrollment: 1727
Study Start Date: October 2004
Study Completion Date: June 2010
Primary Completion Date: June 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Selective D-Dimer use
Procedure: D-dimer testing
Selective D-Dimer use
Active Comparator: 2
Uniform D-Dimer use
Procedure: D-dimer testing
Uniform D-dimer use

Detailed Description:
  • Limiting use of D-dimer testing to outpatients with a Low or Moderate clinical pretest probability (C-PTP)for deep vein thrombosis AND using a D-dimer level of < 1.0 µg FEU/mL to exclude deep vein thrombosis in those with a Low C-PTP, and a D-dimer level of < 0.5 µg FEU/mL to exclude deep vein thrombosis in those with a Moderate C-PTP, is as safe and a more efficient way to diagnose DVT than:
  • Performing D-dimer testing in all patients with suspected deep vein thrombosis with use of a single D-dimer value of < 0.5 µg FEU/mL to exclude thrombosis (current practice).

All randomized patients, including those who are treated for deep vein thrombosis after initial testing, will be followed for a period of 3 months to monitor for signs and symptoms suggestive of deep vein thrombosis, pulmonary embolism, bleeds and death.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Age 18 and older
  • Presenting with symptoms compatible with clinically suspected deep vein thrombosis

Exclusion Criteria:

  • Treatment with full dose anticoagulation for 24 hours or more.
  • Other test for deep vein thrombosis already performed.
  • Ongoing need for therapeutic anticoagulant therapy.
  • Life expectancy less than 3 months.
  • Absence of acute symptoms within 7 days of presentation.
  • Presenting with symptoms of pulmonary embolism.
  • Previous confirmed episode of deep vein thrombosis or pulmonary embolism.
  • Current pregnancy.
  • Geographic inaccessibility which precludes follow-up.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00157677

Canada, Ontario
Hamilton Health Sciences, McMaster
Hamilton, Ontario, Canada, L8N 3Z5
St. Joseph's Health Care Centre
Hamilton, Ontario, Canada, L8N 4A6
Hamilton Health Sciences, Henderson
Hamilton, Ontario, Canada, L8V 1C3
Hamilton Health Sciences, General
Hamilton, Ontario, Canada
Canada, Quebec
SMBD Jewish General Hospital
Montreal, Quebec, Canada, H3T 1E2
Sponsors and Collaborators
McMaster University
Heart and Stroke Foundation of Ontario
Principal Investigator: Lori Linkins, MD McMaster University
Principal Investigator: Clive Kearon, MD McMaster University
Principal Investigator: Jim Julian, MMath McMaster University, Dept. of Clinical Epidemiology and Biostatistics
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: McMaster University Identifier: NCT00157677     History of Changes
Other Study ID Numbers: CTMG-2005-SELECT
Grant Number: NA 5429
Study First Received: September 8, 2005
Last Updated: October 25, 2011

Keywords provided by McMaster University:
deep vein thrombosis
pulmonary embolism
D-dimer testing

Additional relevant MeSH terms:
Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Fibrin fragment D
Antifibrinolytic Agents
Fibrin Modulating Agents
Molecular Mechanisms of Pharmacological Action
Coagulants processed this record on May 25, 2017