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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 41

$Learn the immature reticulocyte fraction normal range, what high or low IRF means, and how IRF helps assess anemia, bone marrow response, bleeding, hemolysis, and treatment recovery.$

Immature Reticulocyte Fraction (IRF) Normal Range: Reference Values and Meaning

Low absolute neutrophil count explained: ANC ranges, neutropenia severity, infection risk, common causes, warning signs, and practical next steps for abnormal CBC results.

Low Absolute Neutrophil Count (ANC): Causes, Infection Risk, and Meaning

Learn what a low basophil count means, why 0 basophils is often normal, common causes such as infection, steroids, allergy, and hyperthyroidism, and when follow-up matters.

Low Basophil Count Blood Test: Causes and Meaning

Learn what a low eosinophil count means, common causes like steroids, infection, stress, and cortisol, and when CBC follow-up or urgent care is needed.

Low Eosinophil Count Blood Test: Causes and Meaning

Learn what a low hematocrit blood test means, including common causes, anemia symptoms, normal ranges, follow-up tests, treatment options, and when to seek care.

Low Hematocrit (Hct) Blood Test: Causes, Symptoms, Anemia, and Meaning

Learn what low hemoglobin means, common anemia causes, symptoms, urgent warning signs, CBC patterns, follow-up tests, and treatment options for low Hgb.

Low Hemoglobin (Hgb) Blood Test: Causes, Symptoms, Anemia, and Meaning

$Learn what a low immature reticulocyte fraction means, how IRF reflects bone marrow response, common causes, follow-up tests, and when low IRF with anemia needs care.$

Low Immature Reticulocyte Fraction (IRF) Test: Causes, Bone Marrow Response, and...

Learn what a low lymphocyte count means, including adult ranges, common causes, infection risk, immune effects, follow-up tests, and when to seek medical care.

Low Lymphocyte Count Blood Test: Causes, Infection Risk, Immunity, and Meaning

Low MCV and high RDW often point to iron deficiency, but other causes can look similar. Learn how this CBC pattern works, which iron tests confirm it, and when follow-up matters.

Low MCV and High RDW: Iron Deficiency Pattern and Meaning

Learn what low MCH means on a CBC, including iron deficiency, microcytic anemia, thalassemia trait, symptoms, follow-up tests, and treatment options.

Low Mean Corpuscular Hemoglobin (MCH) Test: Causes, Iron Deficiency, Anemia, and...

Low MCHC on a blood test often points to iron deficiency or hypochromic anemia. Learn what low MCHC means, common causes, follow-up iron tests, symptoms, and next steps.

Low Mean Corpuscular Hemoglobin Concentration (MCHC) Test: Causes, Iron Deficiency, and...

Low MCV means small red blood cells and often points to iron deficiency, thalassemia trait, or inflammation. Learn what microcytic anemia means, which follow-up tests help, and when low MCV needs medical attention.

Low Mean Corpuscular Volume (MCV) Test: Causes, Microcytic Anemia, and Meaning

Learn what a low MPV blood test means, how platelet size relates to platelet count, common causes of low MPV, warning signs, and follow-up testing.

Low Mean Platelet Volume (MPV) Test: Causes, Platelet Size, and Meaning

Low monocyte count on a blood test can be mild and temporary or linked to infection, medicines, marrow problems, or immune disorders. Learn causes, infection risk, warning signs, and follow-up steps.

Low Monocyte Count Blood Test: Causes, Infection Risk, and Meaning

Learn what a low neutrophil count means, including ANC ranges, neutropenia severity, infection risk, common causes, warning signs, and when follow-up matters.

Low Neutrophil Count Blood Test: Causes, Neutropenia, Infection Risk, and Meaning

Learn what a low platelet count means, including thrombocytopenia ranges, bleeding risk, common causes, urgent symptoms, follow-up tests, and treatment options.

Low Platelet Count Blood Test: Causes, Bleeding Risk, Thrombocytopenia, and Meaning

Low PDW means platelets are more uniform in size than expected. Learn what low platelet distribution width means, common causes, CBC patterns, follow-up tests, and when bleeding symptoms need medical care.

Low Platelet Distribution Width (PDW) Test: Causes, Platelet Variation, and Meaning

Low plateletcrit on a CBC usually reflects low platelet mass from fewer or smaller platelets. Learn common causes, MPV patterns, bleeding risk, false low results, and next steps.

Low Plateletcrit (PCT) Blood Test: Causes, Platelet Mass, and Meaning

Learn what a low RBC count means, including anemia causes, symptoms, normal ranges, follow-up tests, urgent warning signs, and treatment by cause.

Low Red Blood Cell (RBC) Count Test: Causes, Anemia, Symptoms, and...

Low RDW usually means red blood cells are very similar in size and is often not significant. Learn how to interpret low RDW with CBC markers, anemia patterns, MCV, symptoms, and follow-up tests.

Low Red Cell Distribution Width (RDW) Test: Is It Significant, Normal...

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