Cardio Risk Assessment
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Cardio CRP® test results can help you improve risk assessment and recommend appropriate medical and lifestyle interventions.

Colorectal Cancer Detection
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ColoVantage® is a convenient blood test to aid in the detection of colorectal cancer in patients non-adherent to current testing.

Vitamin D Deficiency
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Are you targeting all of your patients at risk? Learn about Vitamin D.

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Gregory Achenbach, MD

Dr. Achenbach is part of our Quest Diagnostics Medical and Scientific Team. He specializes in Anatomic Pathology and Clinical Pathology. More about professional consults.


Michael F. Holick, MD, PhD Discusses Vitamin D

Presentation Vitamin D discussion: its importance for bone health and reducing risk of chronic illnesses including autoimmune diseases, infectious diseases, deadly cancers, as well as discussing the diagnosis, treatment and measurement.

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Two-pronged Strategy for Combating Colorectal Cancer

Colorectal cancer is the second leading cause of cancer related deaths in the U.S. Dr. John Marshall shares two keys to promoting survival—more widespread screening and more targeted therapy. Dr. Marshall is Chief, Division of Hematology and Oncology, Georgetown University Medical Center.

Test Interpretation Guides

See our guides for details on test selection, utilization and interpretation. All information is based on peer-reviewed publications and practice guidelines.