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Understand the 1-mg low-dose dexamethasone suppression test, the common cortisol cutoff of 1.8 mcg/dL, causes of nonsuppression, and the follow-up used for Cushing screening.

Low-Dose Dexamethasone Suppression Test: Cushing Syndrome Screening and Results

Learn how an 8–9 a.m. cortisol test screens for adrenal insufficiency, what low and intermediate results mean, how ACTH helps identify the cause, and when stimulation testing is needed.

Morning Cortisol Test: Low Levels, Adrenal Insufficiency, and Results

Learn how a pheochromocytoma and paraganglioma panel uses plasma or urine metanephrines, normetanephrine, catecholamines, and controlled collection to interpret abnormal results.

Pheochromocytoma and Paraganglioma Test Panel: Metanephrines, Normetanephrine, Catecholamines, and Results

Learn what plasma epinephrine, norepinephrine, and dopamine results mean, why collection posture matters, common causes of high values, and when metanephrine testing is preferred.

Plasma Catecholamines Test: Epinephrine, Norepinephrine, Dopamine, and Results

Learn how plasma free metanephrine and normetanephrine testing screens for pheochromocytoma and paraganglioma, why supine rest matters, and how high or borderline results are evaluated.

Plasma Free Metanephrines Test: Pheochromocytoma and Paraganglioma Screening, High Levels, and Results

Learn what a high plasma normetanephrine result means, why supine rest matters, common false-positive causes, when clonidine testing is used, and how PPGL evaluation proceeds.

Plasma Normetanephrine Test: High Levels, Pheochromocytoma Screening, and Results

Diagnostics

Home Diagnostics Page 40

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

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

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

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

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

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

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 and Low B12 or Folate: Macrocytic Anemia Pattern and...

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.

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

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

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

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.

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

High Monocyte 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.

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

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

High Platelet Count Blood Test: Causes, Thrombocytosis, Clot Risk, 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.

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

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

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: Iron Deficiency, Inflammation, and Meaning

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

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

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.

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

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

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

Learn what a high white blood cell count means, including common causes such as infection, inflammation, stress, medicines, pregnancy, and blood disorders.

High White Blood Cell (WBC) Count Test: Causes, Infection, Inflammation, and...

Learn what immature granulocytes mean on a CBC, including normal IG range, high IG causes, infection and inflammation links, and when follow-up matters.

Immature Granulocytes (IG) Blood Test: High IG, Normal Range, Infection, Inflammation,...

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