Our Test Directory includes detailed information, guides and references for many of our tests. This includes test and result codes, specimen collection requirements, specimen transport considerations, …

Test Guide List This page is a complete list of Test Guides created by Quest Diagnostics.

This Test Guide provides an overview of the use of tests for PD-L1 and other biomarkers involved in selection of PD-1/PD-L1 inhibitor therapy.

This Test Guide provides an overview of tests that assist with the diagnosis, classification, prognosis, and management of chronic myelogenous leukemia (CML).

This test guide is based on the Centers for Disease Control and Prevention guidelines for use of laboratory tests prior to and during pre-exposure prophylaxis (PrEP) for the prevention of HIV …

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This Test Guide discusses the use of laboratory tests for diagnosing diabetes mellitus, monitoring glycemic control in individuals with diabetes, and monitoring diabetic complications.

Quest offers histopathology testing with interpretation by a pathologist. For NSCLC, tests include gross and microscopic tissue examination (test codes 3541 [X] and 3542) and microscopic examination of …

This test guide is designed to assist with test selection and interpretation of common chemistry analytes.

This test guide differentiates the various cystic fibrosis tests offered by Quest Diagnostics. It is intended to help physicians select the optimum test for their patient.