Overutilization in laboratory medicine: tackling the problem with quality improvement science.

Overutilization of tests and treatments is a widespread problem in contemporary heath care, and laboratory medicine is no exception. It is estimated that 10-70% of laboratory tests may be unnecessary, with estimates in the literature varying depending on the situation and the laboratory test. Inappropriate use of laboratory tests can lead to further unnecessary testing, adverse events, inaccurate diagnoses, and inappropriate treatments. Altogether, this increases the risk of harm to a patient, which can be physical, psychological, or financial in nature. Overutilization in healthcare is driven by complex factors including care delivery models, litigious practice environments, and medical and patient culture. Quality improvement (QI) methods can help to tackle overutilization. In this review, we outline the global healthcare problem of laboratory overutilization, particularly in the developed world, and describe how an understanding of and application of quality improvement principles can help to address this challenge.

Reducing free thyroid hormone testing through multiple Plan-Do-Study-Act cycles.

OBJECTIVES: Free thyroid hormones (fT4 and fT3) are one of the most commonly ordered laboratory tests and often ordered when not clinically meaningful. Based on this, many studies have sought to identify strategies to reduce inappropriate fT4 and fT3 testing. The goal of the current study was to implement a quality improvement (QI) framework to identify an optimal approach to reducing inappropriate free thyroid hormone testing through multiple change ideas and Plan-Do-Study-Act (PDSA) cycles. The aim was to reduce fT4 and fT3 30% from baseline at a large tertiary hospital within 12 months. METHODS: The Model for Improvement Framework was used to implement a total of 3 change ideas in the first and second PDSA cycles. Change ideas included implementation and refinement of a free thyroid hormone forced function reflex system, modifications to test requisitions/order-entry interfaces, and a TSH-only option. Process and balancing measures were evaluated to fine-tune the change interventions. Data was continuously monitored pre and post interventions to assess progress, impact and potential errors. RESULTS: In the first PDSA cycle, laboratory testing of fT4 was decreased by 24% and fT3 by 18%. Soliciting physician feedback and assessing balancing measures was important in refining the approach. In the second PDSA cycle, fT4 was decreased by an additional 16% and fT3 by 29%. An audit of the process showed that phone calls to the laboratory to add-on free thyroid hormones did not increase after the second PDSA, averaging 2 calls per month. CONCLUSIONS: To achieve optimal reductions in free thyroid hormone testing, multiple PDSA cycles were required alongside assessing process and balancing measures. Overall, fT4 and fT3 testing was decreased by 39% and 47%, respectively.

Cystic Fibrosis-Related Diabetes Screening in Adults: A Gap Analysis and Evaluation of Accuracy of Glycated Hemoglobin Levels.

OBJECTIVES: We sought to identify the gap in cystic fibrosis-related diabetes (CFRD) screening by means of an oral glucose tolerance test (OGTT) in our tertiary care clinic. Our second aim was to identify the glycated hemoglobin level (A1C) threshold that optimizes sensitivity and specificity for predicting CFRD and impaired glucose tolerance. METHODS: This retrospective study used data housed in the Toronto cystic fibrosis (CF) database. The study population included all adult (≥18 years of age) patients seen in the CF clinic between January 1, 2008, and December 31, 2015. Descriptive statistics were used for the OGTT gap analysis; the CFRD screening rate was calculated on an annual basis as the proportion of eligible patients who received OGTTs. Sensitivity and specificity were calculated using OGTTs as the reference standard and A1C levels as the index test on a sample size of 320 patients. RESULTS: On average, 48.5% of eligible individuals were screened each year for CFRD by OGTTs. A1C thresholds of 5.5% had a sensitivity of 91.8% (75%) and a specificity of 34.1% (33.4%) for the diagnosis of CFRD (and impaired glucose tolerance), respectively. Of the 229 patients with A1C levels <5.5%, 5 test results (2.2%) had OGTTs indicative of CFRD. CONCLUSIONS: The rate of CFRD screening is suboptimal. An alternative screening algorithm using an A1C threshold of 5.5% has the potential to reduce the requirement for OGTTs by 36.7%. A1C levels cannot be used to identify impaired glucose tolerance.

Determining Root Causes and Designing Change Ideas in a Quality Improvement Project.

In this second article of our diabetes quality improvement primer series, readers will become familiar with various diagnostic tools used to understand the root causes of a quality problem. We discuss change concepts, and specific change ideas are developed to match the root causes. We review the application of a plan-do-study-act cycle from the Model for Improvement quality improvement framework to test 1 change idea and measure for the intended improvements.

Implementing Change Ideas, Interpreting Data and Sustaining Change in a Quality Improvement Project.

This article is the third and final installment in our diabetes quality improvement primer series. It summarizes how to interpret real-time data with run charts and highlights 4 key rules that can be applied to understand whether improvement is statistically significant. We also review the importance of outlining a family of measures, including outcome, process and balancing measures. Finally, we discuss strategies for sustaining change.

Beginning a Diabetes Quality Improvement Project.

There is a large evidence-to-clinical practice gap in diabetes care. Application of quality improvement (QI) strategies can be used to improve gaps in care delivery. In this first of 3 articles in the diabetes QI primer series, we introduce the steps required to plan a QI project by using a case example for improving foot screening of people with diabetes. We review how to select an appropriate QI project, conduct a baseline gap analysis to clarify the QI problem and engage stakeholders to ensure successful implementation. The next 2 articles in the series will focus on root-cause analysis, selection of change ideas to improve care gaps, execution of the QI project using rapid-cycle testing and monitoring to sustain improvement over time.

Promoting resource stewardship: Reducing inappropriate free thyroid hormone testing.

RATIONALE: Free thyroxine (fT4) and free triiodothyronine (fT3) tests are often ordered when not clinically warranted. Preventing laboratory overuse by reducing inappropriate fT4 and fT3 testing is one strategy to promote resource stewardship. OBJECTIVES: (1) To characterize the frequency of inappropriate fT4 and fT3 testing and (2) to implement a quality improvement strategy aimed at reducing the number of these tests performed. METHODS: Quality improvement tools were used to create sequential change ideas: (1) education of physicians regarding appropriate indications for ordering fT4/fT3 and (2) implementation of a hospital-wide laboratory and forced-function system with a reflex fT4. This study was conducted at an academic ambulatory care hospital in Toronto, Canada. The main outcomes were the differences in weekly median number of thyroid-stimulating hormone, fT4, and fT3 tests performed during the preintervention, education, and reflex periods using the Kruskal-Wallis test and analysis for special cause variation with statistical process control charts. RESULTS: The median number of fT4/fT3 processed per week was significantly reduced from 90/39 at baseline to 78/34 posteducation and 59/14 postreflex (P < .0001). Comparing preintervention to the reflex period, there was 34% reduction in fT4 and 64% reduction in fT3. The number of processed thyroid-stimulating hormone tests was stable with only 2% variation. Statistical process control charts demonstrated special cause variation following implementation of the reflex system for both fT4 and fT3. CONCLUSIONS AND RELEVANCE: Inappropriate testing of free thyroid indices occurs frequently. The implementation of a reflex fT4 strategy after education was feasible in reducing overall testing by 49% and was effective in promoting resource stewardship.