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Evaluation of Immediate v. Delayed CT/NG Test for Treatment in the ED

This study has been completed.
Information provided by (Responsible Party):
George Washington University Identifier:
First received: November 6, 2013
Last updated: March 10, 2017
Last verified: November 2013
The purpose of this study is to determine if immediate availability of GeneXpert® CT/NG test results reduces the overtreatment rate for ED patients with suspected gonorrhea or chlamydia and to assess changes in clinician management decisions with real-time test results.

Condition Intervention
Reproductive Tract Infections
Device: Roche AMPLICOR CT/NG
Device: Cepheid Xpert CT/NG Test

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: No masking
Primary Purpose: Diagnostic
Official Title: Evaluation of the Cepheid Xpert CT/NG For Management of STI in the ED: Immediate V. Delayed Test Results

Further study details as provided by George Washington University:

Primary Outcome Measures:
  • Percentage of Participants Prescribed Antibiotic Treatment [ Time Frame: one year ]
    Measurement of the number and type of antibiotics prescribed to CT/NG + v. CT/NG - in both groups

  • Health Utilization [ Time Frame: one year ]
    Quantify the number of visits to healthcare facilities/providers and non-ED related medications purchased in 7-10 days after enrollment

  • Healthcare Cost [ Time Frame: one year ]
    To quantify the amount billed to insurance companies and out of pocket expenses for initial encounter

  • Resolution of Symptoms [ Time Frame: one year ]
    Number of patients that report having no symptoms 7 to 10 days after initial encounter

Enrollment: 70
Study Start Date: October 2013
Study Completion Date: March 2015
Primary Completion Date: March 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Real-time results with Cepheid Xpert CT/NG Test
Diagnosis of +/- CT/NG within 2 hours of specimen entering laboratory
Device: Cepheid Xpert CT/NG Test
Active Comparator: Batched results with Roche AMPLICOR CT/NG test
Diagnosis of +/- CT/NG within 1 to 4 days of visit to the ED
Device: Roche AMPLICOR CT/NG

Detailed Description:

The investigators will conduct a randomized controlled trial in patients aged 18 and older where the treating clinician is ordering a CT/NG test. Clinicians will be approached by a research assistant while they are in the ED and asked whether a CT/NG swab will be ordered and if CT/NG is in the differential diagnosis. Then, potentially eligible patients will be approached and asked for consent to enroll. For patients that consent, simple randomization procedure (i.e. random number generator) will be used to assign patients to either immediate test results or delayed test results. Typically, in the ED these tests are ordered for diagnostic rather than screening purposes (symptoms of vaginal discharge, abdominal pain, etc). Patients will be randomized to batched testing with the Roche AMPLICOR CT/NG (standard of care, control group) or immediate testing of clinical specimens with Cepheid CT/NG with real-time result reporting (within 90 minutes) to the treating clinician in the ED. Patient interview and clinician survey will be conducted to ascertain perceptions of illness and the test. A follow up interview will be conducted with the patient to determine clinical and public health outcomes.

A validation of the Cepheid CT/NG test will be conducted against the hospital standard of care on </= 40 pilot participants. Pilot participants will be asked to provide 2 endocervical swabs and a urine specimen. All surveys and interviews will be conducted on pilot patients.

While many outcomes can be measured in this study, the investigators will power this study to reduce the overtreatment rate with antibiotics. Assuming a baseline overtreatment rate of 88% (# treated with antibiotics/# without disease), to reduce this rate by 50% (to 44%), at a power of 80% and alpha of 0.05, the investigators will need to enroll 42 patients (21 controls and 21 study patients) with negative tests. Given an estimated positive rate of 6%, and that approximately 50% of patients who receive these tests for any reason will be treated empirically with antibiotics, the investigators think that enrolling a total of 70 patients with full data (enrollment survey, clinician survey, and follow up survey) would be sufficient to identify trends with this subject matter. Due to the sensitive nature of the subject matter and the high percentages of lost-to-follow up with ED patients, the investigators estimate approximately 50% will have incomplete data. Therefore, the investigators request to enroll 150 patients in the study.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • greater than 18 years
  • clinical suspicion of CT/NG
  • able to give informed consent
  • willingness to wait for test result

Exclusion Criteria:

  • less than 18 years
  • pregnancy
  • prisoners
  • unable to give informed consent
  Contacts and Locations
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Please refer to this study by its identifier: NCT01989130

United States, District of Columbia
The George Washington University Hospital
Washington, District of Columbia, United States, 20036
Sponsors and Collaborators
George Washington University
Principal Investigator: Larissa May, MD George Washington University
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: George Washington University Identifier: NCT01989130     History of Changes
Other Study ID Numbers: 071346
Study First Received: November 6, 2013
Results First Received: February 23, 2016
Last Updated: March 10, 2017

Keywords provided by George Washington University:
antimicrobial stewardship
Cepheid Xpert CT/NG
emergency department
Diagnostic Techniques, Obstetrical and Gynecological
Diagnostic Techniques, Urological

Additional relevant MeSH terms:
Reproductive Tract Infections
Genital Diseases, Male
Genital Diseases, Female processed this record on April 26, 2017