All Digestive System Tests

The Tissue Transglutaminase IgG IgA Antibodies Test detects both IgG and IgA antibodies to tissue transglutaminase, which are commonly elevated in celiac disease. It helps screen for and diagnose celiac disease by identifying an immune response to gluten and may also be used to monitor treatment and dietary adherence.

The Tissue Transglutaminase IgA Antibody Test detects IgA antibodies to tissue transglutaminase, which are commonly elevated in celiac disease. It helps screen for and diagnose celiac disease by identifying an immune reaction to gluten and is also used to monitor treatment response and adherence to a gluten-free diet.

The Tissue Transglutaminase IgG Antibody Test detects IgG antibodies to tissue transglutaminase, which may be elevated in celiac disease. It is especially useful for individuals with IgA deficiency and helps support the diagnosis of celiac disease by identifying an immune reaction to gluten.

The TMAO test measures Trimethylamine N-oxide levels in the blood, a compound produced from dietary nutrients like choline and carnitine. Elevated TMAO has been linked to increased cardiovascular risk and may contribute to atherosclerosis. This test helps assess heart health and guide dietary or lifestyle interventions.

The Transferrin Test measures transferrin, a blood protein that transports iron, to evaluate iron status and nutritional health. High levels may suggest iron deficiency anemia, while low levels may indicate liver disease, malnutrition, or chronic illness. Doctors use this test alongside iron and TIBC to investigate fatigue, weakness, or anemia symptoms. Results provide vital insight into iron balance, red blood cell production, and overall metabolic function.

The Thyroid Stimulating Hormone (TSH) Test measures TSH levels in blood to assess thyroid function and diagnose hypothyroidism or hyperthyroidism. It evaluates how the thyroid controls metabolism, energy, weight, and heart rate. Doctors use the TSH test to investigate symptoms such as fatigue, hair loss, or mood changes. Frequently included in routine health exams, it is also key for monitoring thyroid disease treatment and overall endocrine balance.

The Uric Acid Test measures uric acid levels in blood to assess kidney function and detect gout, a form of arthritis caused by uric acid buildup. High levels may also signal kidney disease, kidney stones, or metabolic disorders, while low levels can occur with liver disease. Doctors use this test to investigate joint pain, swelling, or frequent urination, and to monitor treatment for gout, kidney stones, or chemotherapy-related complications.

The Vitamin A Micronutrient Test measures blood levels of vitamin A (retinol) to assess nutritional status and detect deficiencies or excesses. Adequate vitamin A is essential for vision, immune defense, reproduction, and cellular health. This test helps evaluate malnutrition, absorption issues, or toxicity from supplements, supporting diagnosis and monitoring of overall health.

Patient must be 18 years of age or older.

The Vitamin A Test measures blood levels of vitamin A, a nutrient essential for vision, immune function, reproduction, and skin health. Low levels may indicate malnutrition, fat malabsorption, or liver disease, while high levels may suggest toxicity from over-supplementation. Doctors use this test to investigate night blindness, frequent infections, or poor wound healing. Results provide vital insight into nutritional status, metabolic function, and overall wellness.

The Vitamin B12 Micronutrient Test measures blood levels of vitamin B12, essential for red blood cell production, nerve health, and DNA synthesis. Deficiency can cause anemia, fatigue, neurological issues, and cognitive changes. This test helps identify dietary deficiencies, absorption problems, or related health conditions, supporting diagnosis and ongoing management of overall wellness.

Patient must be 18 years of age or older.

The Vitamin B12 Test measures cobalamin levels in blood to evaluate nutritional health, red blood cell production, and nervous system function. Low B12 can cause anemia, fatigue, weakness, memory problems, and nerve damage, while high levels may indicate liver or kidney disease. Doctors use this test to detect B12 deficiency, monitor treatment, and assess malabsorption conditions like pernicious anemia, Crohn’s disease, or celiac disease.

The Vitamin B12 and Folate Panel Test measures blood levels of vitamin B12 and folate to evaluate nutritional status, red blood cell production, and nervous system health. Deficiencies may cause anemia, fatigue, weakness, neuropathy, or cognitive decline, while elevated levels can indicate liver or kidney disease. Doctors use this panel to diagnose deficiency, monitor therapy, and assess absorption disorders such as pernicious anemia, Crohn’s disease, or celiac disease.

The Vitamin D 1,25-Dihydroxy Test measures the active form of vitamin D in blood to evaluate calcium and phosphorus balance, bone health, and kidney function. Abnormal levels may indicate kidney disease, parathyroid disorders, or problems with calcium metabolism. Doctors order this test when deficiency symptoms don’t match 25-hydroxy vitamin D results or to monitor chronic illness. Results provide vital insight into vitamin D activity, mineral health, and metabolic function.

The Vitamin D 25-Hydroxy Total Test measures levels of 25-hydroxyvitamin D in blood to evaluate vitamin D status, bone health, and calcium balance. It helps detect deficiency, insufficiency, or toxicity, which can affect immune function, muscle strength, and risk of osteoporosis. Doctors use this test to assess overall nutritional health, monitor supplementation, and support diagnosis of metabolic or endocrine disorders linked to vitamin D.

The QuestAssureD™ Vitamin D 25-Hydroxy Total Test measures Vitamin D2, Vitamin D3, and total 25-hydroxy vitamin D to assess overall vitamin D status. Adequate vitamin D supports bone strength, calcium absorption, immune health, and muscle function. Low levels may cause osteoporosis, weakness, or increased disease risk, while high levels can indicate toxicity. Doctors use this test to diagnose deficiency, monitor supplementation, and evaluate metabolic and endocrine health.

The Vitamin E Micronutrient Test measures blood levels of vitamin E to assess antioxidant status and detect deficiencies or excess. Vitamin E protects cells from oxidative damage, supports immune function, and promotes cardiovascular and neurological health. This test helps identify poor dietary intake, absorption issues, or toxicity from supplements, aiding in diagnosis and management of overall wellness.

Patient must be 18 years of age or older.

The Vitamin E Test measures the level of vitamin E (alpha-tocopherol) in the blood to assess antioxidant status and nutritional health. It helps detect deficiencies that may cause nerve and muscle problems, vision issues, or weakened immunity, as well as excess levels that can increase health risks.

The Vitamin K Test measures blood levels of vitamin K, a fat-soluble vitamin essential for normal blood clotting, bone health, and cardiovascular function. Low levels may indicate deficiency linked to bleeding disorders, osteoporosis, or malabsorption. This test helps assess nutritional status, monitor patients on anticoagulant therapy, and support diagnosis of clotting abnormalities or vitamin deficiencies.

The White Blood Cell Count Test with Differential measures total white blood cells and breaks them down into types (neutrophils, lymphocytes, monocytes, eosinophils, basophils). It helps detect infections, inflammation, immune system disorders, bone marrow conditions, and blood cancers. This test provides insight into the body’s defense system and assists in diagnosing underlying health issues or monitoring treatment effectiveness.

The Zinc Micronutrient Test measures blood zinc levels to evaluate nutritional status and detect deficiencies or excess. Zinc is vital for immune function, wound healing, growth, reproduction, and enzyme activity. This test helps identify poor intake, malabsorption, or excessive supplementation, supporting diagnosis and management of overall health, immune balance, and metabolic function.

Patient must be 18 years of age or older.

The Zinc Test measures zinc levels in blood to evaluate nutritional status and overall health. Zinc is essential for immune function, wound healing, growth, taste, and reproductive health. Abnormal levels may cause fatigue, hair loss, delayed healing, or increased infection risk. Doctors use this test to detect zinc deficiency or excess, monitor supplementation, and guide treatment for conditions linked to immune, metabolic, or endocrine imbalance.

The FIT Test (Fecal Immunochemical Test) detects hidden blood in the stool, which may indicate gastrointestinal bleeding. It is commonly used to screen for colorectal cancer and other digestive tract conditions by identifying blood that is not visible to the eye.