[3-LEG] Per-drug shortage chain, one drug (?entity=carboplatin): leading supply narrowing - available labelers against total listed -> current current FDA shortage status per NDC -> realized affected presentations (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: openFDA. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call.

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