Urine drug screening: A guide to monitoring Tx with controlled substances

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doi:10.12788/jfp.0168

Applied Evidence

Urine drug screening: A guide to monitoring Tx with controlled substances

J Fam Pract. 2021 April;70(3):112-120 | 10.12788/jfp.0168

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References

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Test results should be presented in an objective, nonconfrontational, and compassionate manner, not with stigmatizing language, such as “clean” or “dirty.”^1,13,14Using stigmatizing terms such as “substance abuser” instead of “person with a substance use disorder” has been shown, even among highly trained health care professionals, to have a negative effect on patient care.¹³

A given patient might well be using a substance, but if the specimen was obtained outside the detection window, a false-negative result might be reported.

Inevitably, you will encounter an unexpected result, and therefore must develop a rational, systematic, and compassionate management approach. “Unexpected result” is a broad term that includes results that conflict with

a patient’s self-report
your understanding of what the patient is taking (using)
prescribed medications
a patient’s typical substance use pattern.

When faced with an unexpected test result, first, ensure that the result in question is reliable. If a screening test yields an unanticipated finding—especially if it conflicts with the patient’s self-reporting—make every effort to seek confirmation if you are going to be making a significant clinical decision because of the result.^1,14

Second, use your understanding of interference to consider the result in a broader context. If confirmatory results are inconsistent with a patient’s self-report, discuss whether there has been a break in the physician–patient relationship and emphasize that recurrent use or failure to adhere to a treatment plan has clear consequences.^1,14 Modify the treatment plan to address the inconsistent finding by escalating care, adjusting medications, and connecting the patient to additional resources.

Third, keep in mind that a positive urine test is not diagnostic of an SUD. Occasional drug use is extremely common¹⁷ and should not categorically lead to a change in the treatment plan. Addiction is, fundamentally, a disease of disordered reward, motivation, and behavior that is defined by the consequences of substance use, not substance use per se,²⁵ and an SUD diagnosis is complex, based on clinical history, physical examination, and laboratory testing. Similarly, a negative UDS result does not rule out an SUD.^4,10

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