High Total Iron-Binding Capacity (TIBC) Test: Causes, Iron Deficiency, Pregnancy, and Meaning
A high total iron-binding capacity (TIBC) test usually means your blood has more available iron-carrying capacity than expected. In everyday terms, your body has...
High Transferrin Blood Test: Causes, Iron Deficiency, Pregnancy, and Meaning
A high transferrin blood test usually means the body has increased its iron-carrying capacity. Transferrin is a protein made mainly by the liver, and...
High Transferrin Saturation (TSAT) Test: Causes, Iron Overload, Hemochromatosis, and Meaning
Transferrin saturation, often shortened to TSAT, shows how much of the blood’s iron-carrying capacity is currently filled with iron. A high TSAT result can...
High Unsaturated Iron-Binding Capacity (UIBC) Test: Causes, Iron Deficiency, and Meaning
Unsaturated iron-binding capacity, or UIBC, shows how much spare iron-carrying capacity remains in your blood. A high UIBC usually means many transferrin binding sites...
High Vitamin A (Retinol) Test: Causes, Toxicity, Symptoms, and Meaning
A high vitamin A blood test means the retinol level in the blood is above the laboratory’s reference range. This can happen after taking...
High Vitamin B6 (Pyridoxal-5-Phosphate/PLP) Test: Causes, Toxicity, Neuropathy, and Meaning
A high vitamin B6 blood test usually means the level of pyridoxal-5-phosphate, often shortened to PLP or P5P, is above the laboratory’s reference range....
High Vitamin B12 Blood Test: Causes, Supplements, Liver Disease, and Meaning
A high vitamin B12 blood test result usually means there is more B12 circulating in the blood than the lab expects, but it does...
High Vitamin E (Alpha-Tocopherol) Test: Causes, Excess Intake, Bleeding Risk, and Meaning
A high vitamin E blood test usually means there is more alpha-tocopherol circulating in the blood than expected for the lab’s reference range. The...
High Zinc Blood Test: Causes, Toxicity, Copper Deficiency, and Meaning
A high zinc blood test means the amount of zinc measured in serum, plasma, or whole blood is above the laboratory’s reference range. Zinc...
Holotranscobalamin Test: Active Vitamin B12, Low Levels, Deficiency, and Results
Holotranscobalamin is often called “active vitamin B12” because it measures the portion of vitamin B12 attached to transcobalamin, the transport protein that helps deliver...
Homocysteine and MMA: Interpreting B12, Folate, and Methylation Markers
Homocysteine and methylmalonic acid, usually called MMA, are functional blood markers. They do not simply show how much vitamin B12 or folate is floating...
Homocysteine Blood Test: High Homocysteine, B Vitamin Deficiency, Heart Risk, and Results
A homocysteine blood test measures the amount of homocysteine in your blood. Homocysteine is an amino acid made during normal protein metabolism, and your...
Iodine Blood Test Normal Range: Reference Values and Meaning
An iodine blood test measures iodine in serum or plasma, the liquid part of blood. Iodine is a trace mineral your thyroid uses to...
Iron Panel Test: Ferritin, Serum Iron, TIBC, Transferrin Saturation, Iron Deficiency, and Results
An iron panel is a group of blood tests that shows how much iron is available in the blood, how much is stored, and...
Low 1,25-Dihydroxy Vitamin D Test: Causes, Kidney Disease, Calcium Balance, and Meaning
A low 1,25-dihydroxy vitamin D result means the active hormone form of vitamin D, also called calcitriol, is below the lab’s reference range. This...
Low 25-Hydroxy Vitamin D Test: Causes, Deficiency, Symptoms, and Meaning
A low 25-hydroxy vitamin D test means the main circulating storage form of vitamin D in your blood is below the level your body...
Low Calcium Blood Test: Causes, Symptoms, Hypocalcemia, and Meaning
A low calcium blood test means the amount of calcium circulating in your blood is below the reference range for that lab. The medical...
Low Ceruloplasmin Blood Test: Causes, Copper Deficiency, Wilson Disease, and Meaning
Ceruloplasmin is a copper-carrying protein made by the liver. A low ceruloplasmin blood test means the amount of this protein in your blood is...
Low Chromium Blood Test: Causes, Deficiency, Blood Sugar, and Meaning
A low chromium blood test means the measured chromium level in the sample is below that laboratory’s expected range or reporting threshold. It does...
Low Cobalt Blood Test: Causes, Deficiency, B12 Status, and Meaning
A low cobalt blood test usually means there is no meaningful cobalt exposure in the blood sample, not that the body has a dangerous...