Don’t support repeat test ordering (re-testing) at a frequency that is not backed by evidence.

Many analytes have known stability profiles or minimum retesting intervals. In most cases, values will not change during this time. These intervals may be longer than traditional or historical test repeat ordering frequency. Ordering tests more frequently is unlikely to provide clinically meaningful results, and may contribute to iatrogenic anemia. Iatrogenic anemia can worsen patient outcomes. Laboratorians can play an active role in drawing awareness to and/or acting to reduce these types of orders.
For more information:

Chami N, Simons JE, Sweetman A, Don-Wauchope AC. Rates of inappropriate laboratory test utilization in Ontario. Clin Bioch 2017:50;822-7. PMID: 28483406.

Compton M, Szklarski P, Booth G. Duplicate type and screen testing waste in the clinical laboratory. Arch Path Lab Med 2018; 142(3):358-63. PMID: 29210591.

Eaton K, Levy K, Soong C, et al. Evidence-based guidelines to eliminate repetitive laboratory testing. JAMA Int Med 2017:177(12);1833-9. PMID: 29049500.

Lang T, Croal B. National minimum retesting intervals in pathology. A final report detailing consensus recommendations for minimum retesting intervals for use in pathology. 2015. Report by The Royal College of Pathologists.

Tchou MJ, Girdwood ST, Wormser B, Poole M, David-Rodriguez S, Caldwell JT, et al. Reducing electrolyte testing in hospitalized children by using quality improvement methods. Pediatrics 2018:141(5):e20173187. PMID: 29618583.