As per the manufacturer, the target expiration period for Accu-Chek Aviva Test Strips is approximately 18 months from the date of manufacture. The exact expiry date may vary by batch and is printed on the test strip vial and outer packaging. Expiry dates are generally not listed online to avoid confusion between batches. Always check the printed expiry date before use and avoid using expired test strips, as they may give inaccurate blood glucose readings.