Comments on: Why is it necessary to revalidate Working Standards?

By: Musa Alkan

Musa Alkan — Mon, 20 Jan 2020 08:24:04 +0000

Is it necessary to verify the working standard at the end of its shelf life?

By: Dr. Saurabh Arora

Dr. Saurabh Arora — Sun, 07 Jul 2019 15:12:50 +0000

In reply to Greta. All standards should have an expiry date. You should buy standards from ISO 17034 accredited suppliers to make sure you get all the required information.

By: Greta

Greta — Wed, 22 May 2019 23:55:27 +0000

Why is it GC standards do not indicate expiration date? How will I know the accuracy of an unopened GC standard purchased 10 years ago?

By: Dr. Deepak Bhanot

Dr. Deepak Bhanot — Tue, 14 Aug 2018 05:03:48 +0000

In reply to eunice. Reference standard is used at least once for making the working standard. It can be used in between if another set of working standards is to be prepared before its expiry date. However, a working standard 's validity is fixed from its date of preparation.

By: eunice

eunice — Mon, 13 Aug 2018 06:05:42 +0000

Are working standard validity based on the preparation date or is it limited by the reference standard expiry date? Thanks

By: Dr. Deepak Bhanot

Dr. Deepak Bhanot — Mon, 28 May 2018 10:54:36 +0000

In reply to Narendra Singh. The label on standard vial or bottle should bear both date of validation and the next due date. You should use the standard only within its validity. In case it is missed out you should revalidate it before using it.

By: Narendra Singh

Narendra Singh — Sat, 26 May 2018 16:05:53 +0000

If working standard verification not done on time so what is the check point and recommendations cover in investigation report