Dear Abdullah Liaqat

It necessitates the use of laboratory measuring equipment and techniques, just follow these steps:

1. Personnel competency management.

2. Procedures must be documented.

3. Reliable technical records

4. Appropriate facilities and circumstances.

5. Appropriately calibrated equipment

6. Authenticated reference materials

7. Appropriate reagents

8. Appropriate testing procedure.

Kind Regards

Qamar Ul Islam