It is one thing to order a test, but if the investigation is not actually performed, or the test is performed but the results are not followed up or acted upon, the results can amount to a catastrophic compromise in medication safety. A  reminder in the lay media here  https://www.theage.com.au/national/victoria/he-died-alone-after-his-medical-test-results-were-faxed-to-wrong-number-20180510-p4zeia.html Further discussiom, with examples directly related to medication safety can be read here: http://www.ifcc.org/media/331933/eJIFCC2015Vol26No1pp038-046.pdf