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The recommended blood test frequency for patients taking Lipitor and warfarin can vary depending on several factors, including the individual's health status, the dosage of the medication, and the presence of any complicating conditions.

Lipitor, a medication used to treat high cholesterol, does not typically require routine blood tests as part of its standard use [1]. However, it is recommended that patients have their liver function and cholesterol levels monitored regularly, usually every 6-12 months, to ensure that the medication is working effectively and not causing any adverse effects [2].

Warfarin, a blood-thinning medication, requires more frequent monitoring to ensure that the medication is working properly and to prevent bleeding complications [3]. The recommended blood test frequency for patients taking warfarin is usually once or twice a week for the first few weeks after starting the medication, and then every 4-6 weeks thereafter [4]. However, the frequency of blood tests may need to be adjusted based on the individual's response to the medication and any changes in their health status [5].

It is important to note that these recommendations may vary depending on individual circumstances, and patients should follow the specific instructions provided by their healthcare provider.

In summary, the recommended blood test frequency for patients taking Lipitor is usually every 6-12 months, while for patients taking warfarin, it is typically once or twice a week for the first few weeks and then every 4-6 weeks thereafter.

Sources:

1. "Lipitor (atorvastatin)". Drugs.com. <https://www.drugs.com/lipitor.html>.
2. "High cholesterol - Diagnosis and treatment - Mayo Clinic". Mayo Clinic. <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/diagnosis-treatment/drc-20350844>.
3. "Warfarin". Drugs.com. <https://www.drugs.com/warfarin.html>.
4. "Warfarin". MedlinePlus. <https://medlineplus.gov/druginfo/meds/a682033.html>.
5. "Warfarin". Michigan Medicine. <https://www.uofmhealth.org/health-library/d00721a1>.