Remember that as a RN you are not only collecting and reporting data, you are also ASSESSING that data. The assessment (critical thinking) part seems to be what you are missing. When calling a lab result to the provider think about what that result may mean...ie: high Potassium level, what does that mean for this patient and what s/s should one look for? Look up hyperkalemia and assess the client for those s/s. What are their previous levels and why was the lab ordered to begin with? Are they on any medications that could be involved in the elevated level? On dialysis? After your investigation of the data, then call the provider with all the information.
I know it seems alot at first to think about with one lab result, but that is critical thinking. That is ASSESSING the data. You will get quicker and it will get easier over time as you gain experience and it will become second nature to you.