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The E 4 error message on the Walgreens True Result Meter typically indicates a problem with the blood sample, often due to an insufficient amount of blood applied to the test strip. It can also suggest that the test strip may be damaged or expired. To resolve this, ensure you use a new, undamaged test strip and apply an adequate blood sample before retesting. If the error persists, consider consulting the user manual or contacting customer support for further assistance.

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3mo ago

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