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LabCorp (various)

LabCorp operates one of the largest clinical laboratory networks in the world. Labcorp is a leading global life sciences company. With a mission to improve health and improve lives, Labcorp delivers world-class diagnostic solutions, brings innovative medicines to patients faster and uses technology to improve the delivery of care.

Lactate Dehydrogenase (LDH) Isoenzymes Test

The Lactate Dehydrogenase (LDH) Isoenzymes test measures the level of the different lactate dehydrogenase (LDH) isoenzymes in the blood. LDH, also known as lactic acid dehydrogenase, is a type of protein, known as an enzyme. LDH plays an important role in making your body's energy. It is found in almost all the body's tissues. When tissues are damaged or diseased, they release LDH isoenzymes into the bloodstream. The type of LDH isoenzyme released depends on which tissues are damaged. This test can help your provider find out the location and cause of your tissue damage. The five isoenzymes are found in different amounts in tissues throughout the body: LDH-1: found in heart and red blood cells LDH-2: found in white blood cells. It is also found in heart and red blood cells, but in lesser amounts than LDH-1. LDH-3: found in lung tissue LDH-4: found in white blood cells, kidney and pancreas cells, and lymph nodes LDH-5: found in the liver and muscles of skeleton

Lactate/Pyruvate, Filtrate

Lectin Zoomer

The Lectin Zoomer by Vibrant Wellness is an advanced blood test that measures immune reactivity to a wide range of dietary lectins—proteins found in foods like wheat, beans, lentils, peanuts, soy, tomatoes, and other plant-based sources. Using high-sensitivity microarray technology, the panel evaluates IgG and IgA antibodies to help identify potential lectin-related immune responses that may contribute to digestive discomfort, bloating, joint pain, skin issues, or autoimmune flares. Unlike standard food sensitivity panels, the Lectin Zoomer focuses specifically on lectin-containing foods and cross-reactive proteins, offering deeper insight for individuals following elimination diets, autoimmune protocols, or gut-healing programs. Results can help guide personalized nutrition strategies aimed at reducing inflammation and supporting gut barrier integrity. This test is commonly used in functional and integrative medicine to explore hidden food triggers, optimize dietary plans, and support patients with IBS, leaky gut, autoimmune conditions, or unexplained inflammatory symptoms.

Lifestyle Dashboard

Lipid Panel

Your lipid panel reports several numbers: total cholesterol, LDL, HDL and triglycerides. This page explains what each of them means and how they fit together. Lipid Panel: Understanding Your Cholesterol and Triglyceride Results A lipid panel is a blood test that measures cholesterol and triglycerides in your bloodstream. These markers help assess cardiovascular risk, metabolic health, and long-term disease risk. A lipid panel is one of the most commonly ordered lab tests and is often included in routine health screening, annual physicals, and preventive care evaluations. If you are reviewing your lipid panel results, this guide explains what each marker means, what is considered optimal, and what steps you can take if your numbers fall outside the recommended range. What is a lipid panel? A lipid panel (also called a cholesterol panel or lipid profile) measures different types of fats in your blood. These fats are essential for hormone production, cell structure, and energy storage, but abnormal levels can increase the risk of heart disease, stroke, and metabolic conditions.

Lipoprotein Particles and Apolipoproteins

The Lipoprotein Particles and Apolipoproteins category focuses on biomarkers related to cholesterol and fat transport in the body. These include various types of lipoproteins, like LDL and HDL, and apolipoproteins, which are protein components of lipoproteins. Analyzing these markers provides insights into cardiovascular risk, helping to assess the potential for heart disease and stroke. This category is key for understanding lipid metabolism and guiding interventions for heart health.

Liver Health

The liver, one of the most vital organs in the human body, performs a range of critical functions including detoxification, protein synthesis, and the production of biochemicals necessary for digestion. This category encompasses a variety of tests and markers designed to evaluate the health and functionality of the liver. Key tests in this category include liver function tests (LFTs) like Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST), Alkaline Phosphatase (ALP), and Bilirubin, which are essential for assessing the liver's ability to process toxins, produce proteins, and manage bilirubin, a byproduct of red blood cell breakdown. Other significant markers include Gamma-Glutamyl Transferase (GGT), which can indicate liver damage or disease, and albumin and total protein levels, reflecting the liver's synthetic capacity. Elevated or decreased levels of these markers can signal various liver conditions, ranging from hepatitis, fatty liver disease, cirrhosis, to potential impacts from medications or alcohol consumption.

LRA (Lymphocyte Response Assay)

Conventional therapies for autoimmune conditions involve some combination of immune suppressive therapies. In contrast, the LRA (Lymphocyte Response Assay) by ELISA/ACT is a way of determining for each individual what items are burdening the immune system and a system for restoring immune competence. By looking directly at lymphocytes, the LRA detects all 3 types of delayed food and chemical hypersensitivities to as many as 512 items. Reactive items are an adverse load on your body’s immune defenses. This means a reduced ability to respond to new or chronic infections. Reactive items also decrease immune activities needed to repair your body. This can provoke inflammation and self-attack ("autoimmunity"). Avoid strong reactors for six (6) months and moderate reactors for three (3) months to reduce the burden on the immune system and restore your body’s ability to repair. Avoiding reactive items can break the cycle of impaired defense and repair, allowing your body to start the recovery and repair process.

Lupus Anticoagulant Comp

The Lupus Anticoagulant Comprehensive category includes specialized coagulation tests used to detect lupus anticoagulant activity, an immune-mediated clotting abnormality caused by antiphospholipid antibodies. Lupus anticoagulants are antibodies that interfere with phospholipid-dependent clotting reactions in laboratory tests. Despite their name, they are associated with an increased risk of blood clots, not bleeding. Their presence is a defining feature of antiphospholipid syndrome (APS) and may also occur in individuals with systemic lupus erythematosus (SLE), other autoimmune diseases, infections, or transient immune activation. This category evaluates how antiphospholipid antibodies affect clotting pathways using functional coagulation assays, including dilute Russell viper venom time (dRVVT), activated partial thromboplastin time (aPTT)-based assays, confirmatory ratios, and phospholipid neutralization tests. These tests help distinguish lupus anticoagulant activity from factor deficiencies, anticoagulant medications, or other causes of prolonged clotting times.

Lyme Disease Serology

Aid in the diagnosis of Lyme disease in individuals with clinical signs and symptoms consistent with Lyme disease. Lyme disease should be considered based on the presence of typical signs and symptoms of infection in patients with a history of possible exposure to infected ticks. This panel utilizes FDA-cleared assays following the modified two-tiered testing (MTTT) algorithm.

Lyme Testing

Lyme disease is diagnosed using a two-step testing process recommended by the CDC. Understanding which test you had — and what your result means — depends on knowing where in that process your result sits. Step 1 — Screening test (ELISA, EIA, or CIA) The first step is a blood test that measures your overall antibody response to Borrelia burgdorferi, the bacterium that causes Lyme disease. This test may appear on your report as: ELISA (enzyme-linked immunosorbent assay) EIA (enzyme immunoassay) CIA (chemiluminescent immunoassay) — a newer method increasingly used by LabCorp and Quest Lyme Ab Screen Lyme Total Antibody A negative screening result typically ends the testing process. A positive or equivocal result triggers the second step. Step 2 — Western blot (confirmatory test) The Western blot identifies which specific Borrelia burgdorferi proteins your immune system has produced antibodies against. Results are reported band by band. There are two separate panels: IgG panel — 10 bands; positive requires 5 or more reactive. Reflects past or longer-standing exposure.

Lymph Monitoring

Lymphocyte Activity Profile

Also known as: Lymphocyte Act. Profile; T cell count; CD4 count; lymphocyte subsets; TBNK; CD4/CD8 count; B cell count; CD19 count; CD20 count This test measures percentages and absolute numbers of lymphocytes, CD3 T cells, CD4 T cells and CD8 T cells and in lymphocyte subsets also B cells and NK cells. Lymphocytes in peripheral blood (circulation) are heterogeneous and can be broadly classified into T cells, B cells, and natural killer (NK) cells. There are various subsets of each of these individual populations with specific cell-surface markers and function. This assay provides absolute and relative quantitation for the main categories of T cells, B cells, and NK cells. Each of these lymphocyte subpopulations have distinct effector and regulatory functions and are maintained in homeostasis under normal physiological conditions. Each of these lymphocyte subsets can be identified by a combination of one or more cell surface markers. The CD3 antigen is a pan-T-cell marker, and T cells can be further divided into 2 broad categories, based on the expression of CD4 or CD8 coreceptors.

Lymphocyte Subset Panel 2

The Lymphocyte Subset Panel 2 is an advanced diagnostic tool that plays a pivotal role in immunological profiling, offering invaluable insights into the body's immune system. This comprehensive panel is designed to analyze specific subsets of lymphocytes, including T cells, B cells, Natural Killer (NK) cells, and their various subpopulations, providing a detailed overview of immune function. Crucial for diagnosing and monitoring a range of immune-related conditions, this panel is particularly relevant in the context of autoimmune diseases, immunodeficiencies, and in the management of patients with cancer, especially those undergoing immunotherapy. By quantifying subsets like CD4+ and CD8+ T cells, B cells, and NK cells (characterized by CD16 and CD56 markers), the Lymphocyte Subset Panel 2 enables clinicians to assess the immune system's balance and responsiveness. This test is indispensable in clinical settings for evaluating the immune status of patients with recurrent infections, autoimmune disorders, or as part of the pre- and post-treatment assessment in cancer therapy.