Hello,

Participating in an external quality or proficiency test program such as EMQN provides data on the whole analytical process. This could be a good quality indicator for your laboratory.

kind regards 
Daniel

I recommend that you check out the CLSI guideline "HS1-A2: A Quality System Model for Health Care," in which the necessary aspects of the system are identified as Quality System Essentials (QSEs):
https://webstore.ansi.org/standards/clsi/clsihs01a2

I'm not sure whether your lab is a stand-alone lab or is connected to a larger organization, but I would start by finding out what quality means to your organization as a whole and especially to your customers. The gentlemen in the posts above have great ideas, and I would just add that you will want to find quality indicators that are meaningful to the bigger picture of what you do, that your customers appreciate, and your coworkers/employees buy into. It's easy to come up with through-put and quality of product measures, but a lot of times, those measures are assumed by the stakeholders to be at a certain level, and they'll only care if they start failing. That doesn't present you with much input on how to improve. A Kano model analysis of your potential measures might be helpful, too.

Is there a particular kind of quality indicator you are having trouble identifying, ie product or personnel?