Home › CFR › Title 21 › Part 31521 CFR Part 315 — Diagnostic Radiopharmaceuticals§ 315.1— Scope.§ 315.2— Definition.§ 315.3— General factors relevant to safety and effectiveness.§ 315.4— Indications.§ 315.5— Evaluation of effectiveness.§ 315.6— Evaluation of safety.