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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 22

Learn what fasting blood glucose results mean, including normal range, prediabetes, diabetes diagnosis thresholds, low glucose, test preparation, and follow-up steps.

Fasting Blood Glucose Test: Normal Range, Prediabetes, Diabetes Diagnosis, and Results

Learn how fasting glucose and fasting insulin work together, what high insulin with normal glucose can mean, how to calculate HOMA-IR, and when follow-up testing matters.

Fasting Glucose and Fasting Insulin: Interpreting Insulin Resistance

Learn what a fasting insulin test measures, what high insulin can mean, how normal ranges vary, and how insulin results relate to insulin resistance, glucose, HOMA-IR, and follow-up testing.

Fasting Insulin Test: High Insulin, Normal Range, Insulin Resistance, and Results

Learn what the fructosamine blood test measures, the usual normal range, why it helps monitor short-term glucose control, and when results may be high, low, or misleading.

Fructosamine Blood Test: Normal Range, Diabetes Monitoring, Short-Term Glucose Control, and...

Fructosamine vs A1c explained: learn how short-term and long-term blood sugar markers differ, when each test is useful, and why results may not match.

Fructosamine vs A1c: Short-Term vs Long-Term Blood Sugar Monitoring

Learn what the glycated albumin test measures, its normal range, how it compares with A1c and fructosamine, and how results help monitor recent blood sugar control.

Glycated Albumin Test: Normal Range, Diabetes Monitoring, Blood Sugar Control, and...

Compare glycated albumin vs fructosamine for short-term diabetes monitoring, A1c limitations, result ranges, albumin effects, and when each test may be useful.

Glycated Albumin vs Fructosamine: Difference, Diabetes Monitoring, and Meaning

Learn what the hemoglobin A1c test measures, normal and diabetes ranges, how HbA1c compares with glucose tests, what high results mean, and when A1c can be inaccurate.

Hemoglobin A1c (HbA1c) Test: Normal Range, Prediabetes, Diabetes Diagnosis, and Results

Learn what a high anion gap blood test means, including metabolic acidosis, ketoacidosis, lactic acidosis, kidney failure, toxin causes, follow-up tests, and urgent warning signs.

High Anion Gap Blood Test: Causes, Metabolic Acidosis, Ketoacidosis, and Meaning

High blood glucose can come from diabetes, prediabetes, illness, medications, or stress. Learn glucose cutoffs, symptoms, urgent warning signs, and follow-up tests.

High Blood Glucose Test Result: Causes, Hyperglycemia, Diabetes, and Meaning

High C-peptide usually means your pancreas is making extra insulin. Learn how high C-peptide relates to insulin resistance, diabetes type, glucose patterns, kidney function, medications, and when follow-up care matters.

High C-Peptide Blood Test: Causes, Insulin Resistance, Diabetes Type, and Meaning

High glucose and high ketones can signal diabetic ketoacidosis. Learn the DKA risk pattern, warning symptoms, lab clues, common triggers, and when urgent care is needed.

High Glucose and High Ketones: Diabetic Ketoacidosis Risk Pattern

Learn what a high insulin blood test can mean, including insulin resistance, weight gain, normal range issues, glucose patterns, HOMA-IR, causes, symptoms, and follow-up steps.

High Insulin Blood Test: Causes, Insulin Resistance, Weight Gain, and Meaning

High random blood glucose can mean recent food intake, stress, medication effects, prediabetes, or diabetes. Learn what levels mean, when follow-up testing matters, and when high glucose is urgent.

High Random Blood Glucose Test: Causes, Diabetes Screening, Hyperglycemia, and Meaning

Learn what a high serum osmolality test means, including dehydration, diabetes, sodium imbalance, osmol gap, toxic alcohols, symptoms, urgent causes, and follow-up labs.

High Serum Osmolality Test: Causes, Dehydration, Diabetes, Sodium, and Meaning

Learn how to interpret HOMA-IR and fasting insulin for insulin resistance, including formulas, result patterns, cutoffs, limitations, repeat testing, and when to follow up.

HOMA-IR and Fasting Insulin: Interpreting Insulin Resistance Without Overdoing It

Learn what the HOMA-IR test measures, how to calculate your insulin resistance score, what normal and high ranges may mean, and when follow-up testing matters.

HOMA-IR Test: Insulin Resistance Score, Normal Range, Calculator, and Meaning

Learn what fasting insulin normal range means, how high or low insulin is interpreted with glucose, and when results may suggest insulin resistance, low insulin production, or hypoglycemia risk.

Insulin Blood Test Normal Range: Fasting Levels and Meaning

Learn what a lactate blood test measures, normal lactate range, high lactate causes, lactic acidosis, sepsis thresholds, urgent symptoms, and follow-up tests.

Lactate Blood Test: High Lactate, Lactic Acidosis, Normal Range, Sepsis, and...

Learn what a low blood glucose test result means, including hypoglycemia ranges, symptoms, common causes, diabetes medication risks, treatment steps, and when to seek medical care.

Low Blood Glucose Test Result: Causes, Hypoglycemia, Symptoms, and Meaning

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