Learn what common blood tests like CBC and Chem 7 reveal about your health and how they assist in diagnosing conditions like diabetes and heart disease. 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. With Labcorp OnDemand, you can purchase the same tests trusted by doctors, directly from Labcorp. Get reliable, confidential results on everything from general health checks to specific areas like fertility, anemia, diabetes, allergies and more. 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. Our comprehensive test menu and assay development lab services can support your clinical trials in countries around the world and are tailored to your program and requirements. 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. There are many different blood tests. Some tests focus on your blood cells and platelets. Some evaluate substances in your blood such as electrolytes, proteins and hormones. Others measure certain minerals in your blood. Blood-based biomarker testing may help identify patients who are candidates for early antibody treatment. A blood test is a lab analysis of things that may be found in your blood. You may have blood tests to keep track of how well you are managing a condition, such as diabetes or high cholesterol.