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Location: Mark Twain Medical
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Laboratory Services


The Clinical Laboratory provides services dedicated to the well being of the people in our community. Our Laboratory is registered with state, local, and government agencies and is fully accredited by the College of American Pathologists (CAP), Clinical Laboratory Improvement Amendments (CLIA) and the Joint Commission.


Your Convenient Choice 

No appointment is necessary and our business hours are designed to fit into your busy schedule. The hospital Clinical Laboratory is open Monday through Saturday for blood draws and other diagnostic tests.

Local Sample Processing

Over 96% of our Laboratory samples are processed locally. This decreases the possibility of mishandling and shortens the time it takes to report the results to your physician. With some labs, when a diagnostic sample is collected, it can sometimes be shipped out of the region, and even out of the state. 

Using a single source for your lab tests means that your lab results are part of your inpatient and outpatient records.With some labs, when a diagnostic sample is collected, it can sometimes be shipped out of the region, and even out of the state. 

Lab Results and Your Medical Record 

Expenditures from laboratory testing comprise less than one percent of your medical insurance premium, yet greater than 70 percent of the information in the average patient’s record is laboratory results. Over 70 percent of the time, potentially life-changing decisions are made based upon those lab results and about 75 percent of all chart inquiries are to review laboratory results. 

Benefit Your Community  

Whenever you choose Mark Twain Medical Center for your diagnostic testing and any of our other health care services, you help build a healthier community. 

For More Information

Call 209.754.2601 for Laboratory hours of operation, and the tests and samples we provide. 




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 Mark Twain Medical Center    
 768 Mountain Ranch Rd.
 San Andreas CA 95249
 (209) 754-3521
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