A PSA screening measures prostate-specific antigen levels in your blood to help you and your doctor stay informed, especially if you’re at increased risk due to age or family history. Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services. Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services. Quest®, Quest Diagnostics®, any. Find a Labcorp lab in Los Angeles for blood work, specimen drop-off, and health panels. Book an appointment online or choose at-home testing for convenience. A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle, or via fingerprick. Most blood testing companies charge $500 or more for a single test per biomarker, providing only a one-time snapshot that doesn’t capture your long-term health trends or reflect your true baseline. Let’s take a closer look at some common blood tests, including why a doctor may recommend them, how to prepare, what they diagnose, and what the results might mean. Blood tests are commonly part of routine preventative care and diagnostics. Learn about the different types of blood tests and what they mean here. Find a location for lab services near you. Make an appointment for Labcorp blood work or drug tests. Walk-in or book online for a convenient time. Find out about blood tests, including why they’re done, how to prepare, what happens at the test, and when you’ll get your results. Blood tests are common tests healthcare providers use to measure or examine substances in your blood such as blood cells, chemicals, proteins and more.