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...
Low Copper Blood Test: Causes, Deficiency, Anemia, and Meaning
A low copper blood test means the amount of copper measured in the blood is below the lab’s reference range. Copper is a trace...
Low Ferritin Blood Test: Causes, Iron Deficiency, Anemia, and Meaning
Low ferritin usually means your body’s iron stores are running low. Ferritin is a storage protein that holds iron for future use, especially for...
Low Ferritin With Normal Hemoglobin: Iron Deficiency Without Anemia
Low ferritin with normal hemoglobin usually means iron stores are running low before anemia has developed. Hemoglobin can stay within the reference range for...
Low Folate Blood Test: Causes, Deficiency, Anemia, and Meaning
A low folate blood test means your blood level of folate, also called vitamin B9, is below the laboratory’s reference range. Folate helps the...
Low Hepcidin Blood Test: Causes, Iron Overload, Anemia Patterns, and Meaning
Low hepcidin means the body is sending a weak “slow down iron” signal. Hepcidin is a hormone made mainly by the liver, and its...