Whose Threshold Did You Inherit? The Apprenticeship of Cancer Referral.

Cancer referral thresholds are usually presented as products of guidelines, risk estimates and clinical findings. In practice, trainees also learn them through apprenticeship. A supervisor who refers early, watches cautiously, distrusts certain tests or worries about overinvestigation can shape a learner's future decisions long after the placement ends. This article introduces threshold inheritance in the context of the largely unexamined transmission of cancer referral habits, risk tolerance and explanatory language from supervisor to trainee. The problem is not variation itself. Reasonable clinicians may reach different decisions when evidence is incomplete. The educational risk arises when variation remains tacit, authority substitutes for reasoning, and a local habit is absorbed as a universal standard. Cancer education should therefore make referral thresholds visible and discussable. Supervisors can compare decisions on the same borderline cases, identify which elements arise from evidence, experience, system pressure or patient context, and revisit outcomes without allowing diagnosis to retrospectively determine whether the original decision was sound. Learners should be assessed on calibrated reasoning, safety-netting and their ability to explain what would change the plan, rather than conformity with one trainer's preference. Deliberate threshold calibration could help future clinicians develop an accountable referral practice that is neither inherited uncritically nor defended as instinct.