Based on the information provided, it is important to note that I am an AI language model and not a medical professional. Therefore, my response should not be used as medical advice. I strongly recommend consulting with a healthcare provider for personalized recommendations. With that said, I can provide some general information regarding liver enzyme tests and the medication Lipitor (atorvastatin).

Lipitor is a statin, a class of drugs commonly prescribed to lower cholesterol levels [1]. Statins have been associated with elevated liver enzymes in some patients, although this is not a common side effect [2][3]. Nonetheless, liver enzyme tests are often recommended when starting a statin regimen to establish a baseline and monitor potential liver function changes [3].

According to the Mayo Clinic, liver enzyme tests are typically performed before starting a statin and at 12 weeks after beginning the medication or increasing the dosage [3]. These tests may include alanine transaminase (ALT) and aspartate transaminase (AST) measurements [3]. If liver enzyme levels are significantly elevated, a healthcare provider may adjust the dosage or consider an alternative treatment [3].

Sources:

1. [DrugPatentWatch](https://www.drugpatentwatch.com/p/tradename/LIPITOR)
2. [NCBI - PMC7526761](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7526761/)
3. [Mayo Clinic - Statin Side Effects](https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013)