underdetection

From under- + detection.

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underdetection (uncountable)

1. Detection at excessively low levels, or at levels lower than are actually the case
   • 2009 January 13, Nicholas Bakalar, “Prognosis: Left Behind in Prostate Cancer Screening”, in New York Times‎^[1]:

     "But this study says that in these very disadvantaged men, there is underdetection and undertreatment, that the cancers are not being found early enough."

• underdetect