• Kimberly Wintemute, Michelle Greiver, Warren McIsaac, M Elisabeth Del Giudice, Frank Sullivan, Babak Aliarzadeh, Sumeet Kalia, Chris Meaney, Rahim Moineddin, and Alexander Singer.
• Assistant Professor in the Department of Family and Community Medicine at the University of Toronto in Ontario and a family physician on the North York Family Health Team in the Department of Family and Community Medicine at North York General Hospital.
• Can Fam Physician. 2019 Nov 1; 65 (11): e487-e496.

ObjectiveTo assess the effectiveness of a Choosing Wisely Canada (CWC) initiative to improve thyroid-stimulating hormone (TSH) test ordering for patients with no identified indication for this test.DesignRetrospective parallel cohort study using routinely collected electronic medical record (EMR) data. The CWC initiative included supporting primary care leads in each participating family health team, providing education on better test ordering, and allowing adaptation appropriate to each local context.SettingToronto, Ont, and surrounding areas.ParticipantsFamily physicians contributing EMR data to the University of Toronto Practice-Based Research Network and their patients aged 18 or older.Main Outcome MeasuresProportion of adult patients with a TSH test done in a 2-year period (2016 to 2017) in the absence of EMR data with an indication for TSH testing; proportion of TSH test results in the normal range for those patients; and change in the rate of TSH screening in sites participating in the CWC initiative compared with sites not participating.ResultsA total of 150 944 patients (51.7% of studied adults) had no identified indication for TSH testing; 33.4% of those patients were seen by physicians in the family health teams participating in the CWC initiative. Overall, 35.1% of all patients with no identified indication had at least 1 TSH test between January 1, 2016, and December 31, 2017. The 119 physicians participating in the CWC initiative decreased their monthly rate of testing by 0.23% from 2016 to 2017, a relative reduction of 13.2%. The 233 physicians not participating decreased testing by 0.04%, a relative reduction of 1.8%. The monthly difference between the 2 groups was 0.19% (95% CI -0.02 to -0.35 P = .03), a relative difference of 11.4%. The TSH testing decreased for almost all CWC patient subgroups. More than 95% of patients tested in both groups had TSH results in the normal range.ConclusionThis study found high rates of TSH testing without identified indications in the practices studied. A CWC initiative implemented in primary care was effective in reducing TSH testing.Copyright© the College of Family Physicians of Canada.

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