Should Psychiatry Test For Lead More?

Answers Siderea's challenge (riffing on Dumont's lead-poisoned psychiatric patient) -- why don't psychiatrists routinely test for lead? -- with a model piece of clinical epistemics. Lead is just one of thirty-plus weakly-evidenced contributors to depression (zinc, toxoplasma, copper, vitamin D, cortisol, microbiome, inflammation...); you can't test for all of them because of cost, needle-sticking, and crucially because 'everybody is weird in a bunch of ways' (abnormal results with no action plan). He marshals the prostate/breast-screening walk-backs, dismantles the lone lead-depression epidemiology study (Bouchard: poverty confound, implausibly large effect, suspicious modeling, never replicated), invokes the maxim 'never run a test you have no plan to act on,' and offers the three-archetype taxonomy of how doctors handle weak-evidence ideas (Group 1 evidence-based establishment, Group 2 Dr. Oz, Group 3 respectable-doctor-with-one-Big-Idea), defaulting to Group 1 because trying to out-reason the guideline bodies means 'wading through ankle-deep skulls.'

Quality 77 · Excellent. Excellent-low: a lucid, broadly transferable treatment of clinical decision-making under a sea of weak-evidence hypotheses, with several durable, quotable concepts ('everybody is weird in a bunch of ways,' the no-action-plan testing maxim, the three-doctor taxonomy, 'ankle-deep skulls') that generalize well beyond lead. Changes how a careful reader thinks about 'why don't doctors just test for X?' Held just inside Excellent by its nominal single-question scope.

Claude’s paradigm shift 62 · Notable shift. A fresh, memorable synthesis -- the weak-evidence-sea framing, the action-plan principle, and the three-archetype taxonomy are genuinely novel articulations, though grounded in evidence-based-medicine and base-rate reasoning. Notable shift.

Real-world impact 2 · Minor. An influential within-discourse articulation of evidence-based clinical conservatism; it explains rather than changes practice/guidelines. Within-blog/small-community influence.