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The Ionized Calcium Test measures the biologically active form of calcium in blood, essential for nerve signaling, muscle contraction, and heart function. Unlike total calcium tests, it reflects only free calcium not bound to proteins. Doctors order this test to evaluate parathyroid disorders, kidney disease, cancer, or critical illness. Results help diagnose hypocalcemia or hypercalcemia and guide treatment for electrolyte and metabolic imbalances.

The Ceruloplasmin Test measures levels of ceruloplasmin, a copper-carrying protein made in the liver, to evaluate copper metabolism and related disorders. Low levels may indicate Wilson’s disease, Menkes disease, or severe liver disease, while high levels may suggest inflammation or pregnancy. Doctors order this test for patients with liver problems, neurological symptoms, or abnormal copper levels. Results help diagnose metabolic disorders and guide treatment.

The Copper Test measures copper levels in blood to evaluate nutritional status, liver function, and metabolic health. Abnormal levels may indicate Wilson’s disease, Menkes disease, liver disorders, or malnutrition. Both deficiency and excess copper can affect nervous system, immune function, and energy metabolism. Doctors use this test to investigate unexplained symptoms, monitor treatment, or assess copper-related disorders, providing key insight into overall health.

The Erythropoietin (EPO) Test measures levels of erythropoietin, a hormone made by the kidneys that stimulates red blood cell production. Abnormal levels may indicate anemia, chronic kidney disease, or bone marrow disorders. Elevated EPO can also occur with low oxygen levels or tumors. Doctors order this test for patients with unexplained fatigue, shortness of breath, or abnormal blood counts. Results help guide diagnosis, treatment, and monitoring of anemia-related conditions.

The Ferritin Test measures ferritin, a protein that stores iron in the body, to evaluate iron levels and detect deficiency or overload. It helps diagnose anemia, iron deficiency, hemochromatosis, and chronic disease-related inflammation. Doctors often order the ferritin test to investigate fatigue, weakness, or unexplained symptoms. It is also used to monitor iron supplementation, treatment effectiveness, and overall iron metabolism health.

The Complete Blood Count with Differential and Platelets Test is a comprehensive blood test that checks red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. The differential analyzes types of white blood cells to detect infections, anemia, clotting abnormalities, immune conditions, and certain cancers. This essential test is often ordered for routine health exams, diagnosis, and monitoring treatment progress.

The Hemoglobin Test measures the amount of hemoglobin in blood, the protein that carries oxygen to tissues. Low hemoglobin may indicate anemia, blood loss, or nutritional deficiencies, while high levels may suggest dehydration, lung disease, or bone marrow disorders. Doctors order this test to evaluate fatigue, weakness, or shortness of breath. Results provide key insight into oxygen transport, red blood cell health, and overall hematologic function.

The Iron Total Test measures iron levels in blood to evaluate nutritional status, red blood cell production, and overall metabolic health. Abnormal levels may indicate iron deficiency anemia, chronic blood loss, or poor absorption, while high levels may suggest hemochromatosis, liver disease, or iron overload. Doctors use this test to investigate fatigue, weakness, or pallor and to monitor treatment. Results provide key insight into anemia and iron balance.

The Iron Total and Total Iron Binding Capacity (TIBC) Test measures iron levels in blood along with the blood’s ability to transport iron. It helps diagnose iron deficiency anemia, iron overload (hemochromatosis), and monitor nutritional or chronic health conditions. Low iron or high TIBC may indicate anemia, while high iron or low TIBC can suggest overload. Doctors use this test to evaluate fatigue, weakness, or other symptoms linked to iron and metabolic health.

The Magnesium RBC Test measures magnesium inside red blood cells, providing a more accurate assessment of magnesium status than serum tests. Magnesium is vital for energy production, muscle and nerve function, heart rhythm, and bone health. Low levels may cause fatigue, cramps, arrhythmias, or weakness, while high levels may signal kidney issues. Doctors order this test to detect deficiency, monitor therapy, and evaluate overall metabolic and nutritional health.

The Potassium RBC Test measures potassium levels inside red blood cells, providing a more accurate assessment of long-term potassium status than serum testing. Potassium is essential for muscle contraction, heart rhythm, nerve signaling, and fluid balance. Abnormal results may indicate deficiency from poor diet or diuretics, or excess linked to kidney dysfunction. Doctors use this test to evaluate metabolic health and guide electrolyte management.

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 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 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.