Evidence-Based Supplement & Herb Guides

High Basophil Count Blood Test: Causes, Allergies, Inflammation, and Meaning

High basophil count on a CBC can mean allergies, inflammation, infection, thyroid disease, or a blood disorder. Learn causes, warning signs, and follow-up tests.

A high basophil count means your complete blood count with differential found more basophils than expected in your blood. Basophils are the least common...

High Eosinophil Count Blood Test: Allergies, Asthma, Parasites, and Meaning

Learn what a high eosinophil count means, including mild, moderate, and severe eosinophilia, common causes such as allergies, asthma, parasites, and medicines, and when follow-up matters.

A high eosinophil count means one type of white blood cell is above the lab’s reference range. Eosinophils help the immune system respond to...

High Hematocrit (Hct) Blood Test: Causes, Dehydration, Polycythemia, and Meaning

Learn what a high hematocrit blood test means, including dehydration, polycythemia vera, sleep apnea, smoking, testosterone, symptoms, risks, and follow-up tests.

High hematocrit means a higher-than-expected percentage of your blood volume is made up of red blood cells. Because red blood cells carry oxygen, the...

High Hemoglobin (Hgb) Blood Test: Causes, Polycythemia, Dehydration, and Meaning

High hemoglobin on a blood test can come from dehydration, smoking, sleep apnea, testosterone, high altitude, lung disease, or polycythemia vera. Learn what high Hgb means and when follow-up is needed.

High hemoglobin means the blood contains more hemoglobin than expected for your age, sex, and lab’s reference range. Hemoglobin is the iron-containing protein inside...

High Immature Reticulocyte Fraction (IRF) Test: Causes, Anemia Recovery, and Meaning

$Learn what a high immature reticulocyte fraction means, how IRF relates to anemia recovery, blood loss, hemolysis, and bone marrow response, and which follow-up tests help explain the result.$

Immature reticulocyte fraction, often shortened to IRF, is a blood test marker that shows how many young, newly released reticulocytes are present in your...

High Lymphocyte Count Blood Test: Causes, Viral Infection, Leukemia Risk, and Meaning

Learn what a high lymphocyte count means, including viral infection causes, absolute lymphocyte count interpretation, leukemia risk signs, and follow-up tests.

A high lymphocyte count means your blood has more lymphocytes than expected for your age and lab range. Lymphocytes are white blood cells that...

High MCV and Low B12 or Folate: Macrocytic Anemia Pattern and Meaning

High MCV with low B12 or folate can signal macrocytic anemia. Learn what this CBC pattern means, common causes, follow-up tests, symptoms, treatment, and recovery.

High MCV with low vitamin B12 or low folate usually points to a macrocytic anemia pattern, where red blood cells are larger than expected...

High Mean Corpuscular Hemoglobin (MCH) Test: Causes, Macrocytic Anemia, and Meaning

Learn what a high MCH blood test means, including links to macrocytic anemia, vitamin B12 or folate deficiency, alcohol use, liver disease, symptoms, and follow-up tests.

Mean corpuscular hemoglobin, or MCH, is one of the red blood cell numbers reported on a complete blood count. It estimates how much hemoglobin...

High Mean Corpuscular Hemoglobin Concentration (MCHC) Test: Causes, Spherocytosis, and Meaning

Learn what a high MCHC blood test means, including normal ranges, false high results, hereditary spherocytosis, hemolysis, spherocytes, symptoms, and follow-up tests.

A high mean corpuscular hemoglobin concentration, or high MCHC, means the hemoglobin inside your red blood cells looks more concentrated than expected. MCHC is...

High Mean Corpuscular Volume (MCV) Test: Causes, Macrocytic Anemia, B12, Folate, and Meaning

Learn what a high MCV blood test means, including macrocytosis, macrocytic anemia, vitamin B12 and folate deficiency, common causes, follow-up tests, treatment, and when to seek care.

Mean corpuscular volume, usually shortened to MCV, is the average size of your red blood cells. A high MCV means those cells are larger...

High Mean Platelet Volume (MPV) Test: Causes, Platelet Activation, and Meaning

High MPV means platelets are larger than expected. Learn what high mean platelet volume means, common causes, platelet activation links, risks, and follow-up tests.

Mean platelet volume, or MPV, is a platelet size marker reported on many complete blood count results. A high MPV means your platelets are...

High Monocyte Count Blood Test: Causes, Infection, Inflammation, and Meaning

Learn what a high monocyte count means, including normal ranges, infection and inflammation causes, blood disorder warning signs, follow-up tests, and when to seek care.

A high monocyte count means one type of white blood cell is above the expected range. Monocytes help your immune system clean up infection,...

High Neutrophil Count Blood Test: Causes, Infection, Inflammation, and Meaning

Learn what a high neutrophil count means, common causes such as infection and inflammation, when results are urgent, and how doctors evaluate neutrophilia.

A high neutrophil count usually means your immune system is reacting to something recent or ongoing. Neutrophils are the most common white blood cells...

High Platelet Count Blood Test: Causes, Thrombocytosis, Clot Risk, and Meaning

Learn what a high platelet count means, including thrombocytosis causes, essential thrombocythemia, clot and bleeding risk, follow-up tests, and treatment options.

A high platelet count means your blood test found more platelets than expected in a measured amount of blood. Platelets are small blood cells...

High Platelet Distribution Width (PDW) Test: Causes, Platelet Activation, and Meaning

High PDW means your platelets vary more in size than expected. Learn common causes, platelet activation links, platelet count patterns, symptoms, and follow-up tests.

Platelet distribution width, or PDW, is a platelet size-variation marker that may appear on a complete blood count. A high PDW means the platelets...

High Plateletcrit (PCT) Blood Test: Causes, Platelet Mass, Clot Risk, and Meaning

Learn what a high plateletcrit (PCT) blood test means, including platelet mass, common causes, clot risk, CBC interpretation, follow-up tests, and when to seek care.

Plateletcrit, often shortened to PCT on some complete blood count reports, estimates the total volume of platelets in your blood. A high plateletcrit usually...

High Platelets and Low Ferritin: Iron Deficiency, Inflammation, and Meaning

High platelets and low ferritin often point to iron deficiency with reactive thrombocytosis. Learn common causes, CBC patterns, inflammation clues, follow-up tests, and when high platelets need urgent evaluation.

High platelets and low ferritin most often point toward iron deficiency with a reactive rise in platelets. Ferritin reflects stored iron, while platelets are...

High Red Blood Cell (RBC) Count Test: Causes, Polycythemia, Dehydration, and Meaning

Learn what a high RBC count means, including dehydration, polycythemia vera, sleep apnea, smoking, oxygen problems, symptoms, risks, and follow-up tests.

A high red blood cell count means your blood sample contains more red blood cells than expected for your age, sex, hormone status, altitude,...

High Red Cell Distribution Width (RDW) Test: Causes, Anemia, Iron Deficiency, and Meaning

Learn what a high RDW blood test means, including common causes, anemia patterns, iron deficiency, B12 and folate deficiency, MCV interpretation, and follow-up tests.

A high red cell distribution width, or high RDW, means your red blood cells vary more in size than expected. This pattern is called...

High Reticulocyte Count Test: Causes, Anemia Recovery, Blood Loss, and Meaning

High reticulocyte count explained: common causes, anemia recovery patterns, blood loss, hemolysis, normal ranges, follow-up tests, and when to seek care.

A high reticulocyte count usually means your bone marrow is releasing extra young red blood cells into the bloodstream. That can be a healthy...