C25279Level 4

Onset

**Semantic type:** Temporal Concept

**Definition:** The start, beginning, or early stages.

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C124353Symptom Onset

C161520Acute Onset

C161521Delayed Onset

C161522Acute and Delayed Onset

C168367Onset of Chief Complaint

C199251De Novo Onset of Chronic Graft Versus Host Disease

C199252Progressive Onset of Chronic Graft Versus Host Disease

C199253Quiescent Onset of Chronic Graft Versus Host Disease

C67104First Ever Onset of Heart Failure Event

C94495Onset of Action

C94516Late or Variable Onset

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