Because of your headaches on how many days in the last 3 months was your productivity at work or school reduced by half or more [PhenX]

LOINC: 65382-4Type: OtherCPT: N/A

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A diagnostic test used to support clinical decision-making.

Sources
  1. [1]LOINC — Logical Observation Identifiers Names and Codes. Regenstrief Institute