The Great Plains Laboratory, Inc. (GPL) is the leader in metabolic testing for patients with neurological, gastrointestinal, and other chronic health disorders.  We offer tests for organic acids, amino acids, essential fatty acids, inflammation, metal toxicity, non-metal chemical toxicity, mycotoxins, food allergies, and more.  Our laboratory provides the most reliable, comprehensive, and understandable scientific results, using the latest technology.  We look forward to providing you with the most comprehensive testing and most personalized treatment plans possible.  Find out more by visiting our web site here.

If you are a healthcare practitioner interested in opening an account with us or getting more information, please e-mail us at sales@gpl4u.com or call (913) 341-8949.  If you are a patient or a family member of a patient and would like more information, please visit out web site here, e-mail us at customerservice@gpl4u.com, or call (913) 341-8949.




Thank you for listening to the CoreBrain Journal podcast with Dr. Charles Parker.  As a listener, you are clearly invested in improving the health (both mental and physical) of your patients, a family member, or yourself. 

To show our appreciation, this week we are giving away a FREE Organic Acids Test to one lucky winner! 

The Organic Acids Test (OAT) provides an accurate metabolic snapshot of what is going on in the body. Besides offering the most complete and accurate evaluation of intestinal yeast and bacteria, it also provides information on important neurotransmitters, nutritional markers, glutathione status, oxalate metabolism, and much more. The test includes 74 urinary metabolite markers that can be very useful for discovering underlying causes of chronic illness.

To learn more about our Organic Acids Test and access free resources for it, click here.



To enter to win, complete the form  below and submit it by 8:00 am Central on Monday, July 30th.  We will draw one winner from the week’s entries and will reach out to the winner to claim his/her free test. 

Name *
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What Kinds of Tests Are You Interested In?