Non-essential blood tests in the intensive care unit: a prospective observational study
Michael Mikhaeil1, Andrew G Day2, Roy Ilan3
1School of Medicine, Queen's University, Kingston, ON, Canada. mmikhaeil@qmed.ca.
Insights
Nearly half of blood tests in an intensive care unit (ICU) were deemed unnecessary by physicians, contributing to significant waste. This highlights a need to address non-essential blood testing practices in acute care settings.
Area of Science:
- Clinical Medicine
- Healthcare Management
- Laboratory Medicine
Background:
- Non-essential blood testing contributes to patient harm, provider burden, and healthcare costs.
- The extent of unnecessary blood testing in acute care, particularly intensive care units (ICUs), remains largely undescribed.
Purpose of the Study:
- To quantify the proportion of unnecessary blood tests performed in a tertiary care intensive care unit (ICU).
- To assess the financial impact of non-essential blood testing in an ICU setting.
Main Methods:
- Attending physicians identified essential blood tests daily for ICU patients over four weeks.
- The proportion of processed tests deemed essential was calculated using descriptive statistics.
- Statistical tests (Wilcoxon rank-sum, Spearman correlation) assessed associations between patient characteristics and unnecessary test costs.
Main Results:
- Physicians identified only 48.7% of 694 processed blood tests as essential.
- Non-essential tests accounted for 46.0% of the total cost ($2,243.41 out of $4,882.11).
- Patient demographics and clinical status did not correlate with the number of non-essential tests.
Conclusions:
- A significant portion of blood tests in the ICU are considered unnecessary by attending physicians.
- Non-essential blood testing represents a substantial financial burden in critical care.
- Further investigation is needed to understand and mitigate wasteful blood testing practices.
Purpose:
Non-essential blood testing in the acute care setting can be a prominent source of morbidity, patient discomfort, increased workload for the healthcare provider, and wasteful spending. The magnitude of such non-essential blood testing has not been well described. We aimed to measure the extent of unnecessary blood testing in a 33-bed intensive care unit (ICU) at a tertiary-care teaching hospital in Ontario, Canada.
Methods:
Over a period of four weeks, all ICU attending physicians were asked to select, from a comprehensive list, blood tests that they deemed essential to the appropriate care for each of their patients on the following day. The actual tests processed on the following day were recorded. Descriptive statistics were used to determine what proportion of all processed tests were deemed essential blood tests. The association between patient characteristics and the total cost of unnecessary tests was assessed using the Wilcoxon rank-sum test and the Spearman correlation coefficient, as appropriate.
Results:
Nine attending physicians provided input for a total of 81 patient days. In 65 (80%) of these days, at least one test was considered non-essential. Physicians deemed only 338 (48.7%) of 694 processed blood tests as essential, which amounted to $2,243.41 (46.0%) out of an overall cost of $4,882.11. Patients' age, sex, mechanical ventilation status, and treatment with vasoactive drugs on the study day were not associated with the number of non-essential tests.
Conclusions:
Attending physicians deemed a substantial proportion of the blood tests processed in a tertiary care ICU setting as unnecessary. Furthermore, the non-essential tests incurred substantial additional cost. Further work is required to gain a better understanding of the underlying factors contributing to these wasteful practices.
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