Sink test is a form of medical laboratory diagnostics healthcare fraud whereby clinical specimens are discarded, via a sink drain, and fabricated results are reported, without the clinical specimen actually being tested. ^[1]

In the United States, the prevalence of sink test laboratories in the 1980s led in part to regulation following the passage of Clinical Laboratory Improvement Amendments in 1988. ^[2]

While this illegal practice still occurs, it is rare within the highly regulated US lab market.

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