A laboratory-developed method for a calibration can be used if it is:

A laboratory-developed method for calibration must be validated and appropriate for the intended use to ensure its effectiveness and reliability. Validation involves demonstrating that the method produces accurate and consistent results under the specific conditions it will be used. This is critical because calibration affects measurement accuracy and, consequently, the quality of products or services.

When a method is validated, it provides assurance that it will perform as expected in real-world applications. This includes confirming that the method can consistently produce results within specified limits and that it is suitable for the specific calibration needs. Therefore, not only does the method need to work effectively, but it must also align with the requirements of the measurements being made.

While approval from an external committee can lend credibility, it is not a prerequisite for a laboratory-developed method. Factors like cost-effectiveness, efficiency, and ease of implementation also play a role in choosing a calibration method, but these considerations do not substitute for the necessity of validation and appropriateness for the intended use.