Select Reference Laboratories, LLC.

Our mission is to improve lives by delivering diagnostic solutions to patients and clients quickly and efficiently via technology. We serve a broad range of customers, including managed care organizations, physicians and other healthcare providers, hospitals and health systems, employers, patients and consumers.

We serves a broad range of customers, including managed care organizations, physicians and other healthcare providers, hospitals and health systems, employers, patients and consumers.
Young students of chemistry working together in laboratory


Our routine clinical chemistry is performed using a unique reagent system that is free of chromic interference from hemolysis, lipemia, and jaundice giving us fast and accurate results.


Select Laboratories offers a variety of toxicology testing services, including: blood drug profiles, meconium drug panels, therapeutic drug monitoring, synthetic/designer drugs and pharmaceutical quantitation that are fast, versatile, cost-effective, and reliable.
Doctor testing patients urine for medical purposes


Our urology testing offers clients a vast range of procedures, from ordinary PSA tests to complex methods of kidney stones detection and biopsy. Our team provide advanced, in-house testing, including comprehensive Immunohistochemistry (IHC) panels, to supplement morphological evaluations of difficult cases.
Blood test service with disposable lancet. Smiling woman at clinic. Female worker assistant performing pierce

Hematology and Coagulation

Our Hematology department utilizes the latest technological advances in providing accurate results for a variety of blood formation and blood disorders. This includes but is not limited to testing on Complete Blood Count (CBC), serum, urine, and other body fluids. Our specific areas of testing range from routine hematology testing to more advanced testing.

Health & Wellness Testing

Your hormone levels affect how you feel on a daily basis.  The slightest dysfunction of your hormones can result in increased weight, fatigue, mood changes and sleep disturbances.

Our Hormone Testing gives you the overall picture of where you stand with your hormone levels.  Having that information will give you a great advantage after consulting with your physician to correct any hormone levels.

Who We Are

Select Reference Laboratories is a full-service regional laboratory serving communities in Guilford, Forsyth, and Alamance Counties.

Select Reference Laboratories offers clinical reference laboratory services to Physician’s offices, clinics, and other healthcare facilities. Short turn-around times for routine testing and excellent STAT turnaround testing for the more common test requests, helps the physician provide the highest standards of patient care.

State-of-the-art instrumentation integrated with our Laboratory Information System (Select IS) is combined with internal quality control processes ensuring the highest standards of clinical laboratory testing and test reporting that meet and exceed Federal standards.

CLIA certified and participate in proficiency testing with the American Association of Bioanalysts (AAB) and use state-of-the-art SSL and 254 bit data encryption protocols to ensure confidentiality and HIPAA compliance 

Why We Are Different



Excellent customer service
Order entry and results retrieval
EMR Interface available.
Routine tests performed daily.



We can customize our processes to accommodate your workflow. For example, we can design a new requisition form, provide courier service, and phlebotomy supplies.



We offer our own proprietary, cloud-based, intuitive, easy to use, and flexible Lab Information System. Our Select IS® system has advanced functionality and can interface with your practice’s Electronic Medical Record (EMR) and/or billing system.


Easy-to-interpret Results

With our Select IS system, you have the ability customize the format of your test results report.

I'd like to know more

For general inquiries about our services, specimen pickup or how we can help your practice or nursing facility.

Please contact us to determine which courier service is available in your area. If you have any questions or comments about this web site or any Select Lab services or procedures, fill out and submit the form with your question or comment.

    Get In Touch!

    We are looking forward to helping you with all your Reference Lab needs

    Call or e-mail, to contact Select-labs of Marion County. We look forward to hearing from you and will normally respond within 1-2 business days.


    1100 Revolution Mill Drive,
    Greensboro, NC 27405

    Business Hours

    Mon – Fri …… 9 am – 6 pm
    Sat, Sun …… Closed

    Highly Qualified Team


    Ernie Knesel


    Select Laboratories was founded by Ernie Knesel and his team of clinical laboratory professionals, leaders in the industry with over 250 years of cumulative experience in laboratory operation and management.

    Bill Waddington

    Co-Founder, Executive Vice President

    Mr. Waddington, who has extensive experience in diagnostics sales, marketing, customer service and support, joined Select Laboratory Partners in 2009, he relocated to the United States to become Co-Head of Sales for SLP focusing primarily in the Southeastern United States

    Patrick Rainey, PhD


    Dr. Rainey joined SLP as the Director of Analytical Toxicology in 2012 and was promoted to Chief Scientific Officer in 2014 and COO in 2016.  Dr. Rainey’s responsibilities include leading a team of scientists that manage SLP’s client portfolio of practice-owned laboratories and reference laboratories, directing research and development efforts for alternative clinical testing regimes utilizing LC-MS/MS technology and performing the scientific work required to obtain FDA approval for new clinical analyzers and reagent product offerings.

    Leonardo Black

    Marketing Director

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