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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 53

Learn how doctors rule out medical causes of depression, anxiety, and brain fog, including common blood tests, sleep issues, hormone problems, imaging triggers, and what normal results really mean.

How Doctors Rule Out Medical Causes of Depression, Anxiety, and Brain...

Learn how doctors evaluate trouble concentrating, separate ADHD from anxiety and sleep loss, and decide when screening tools, lab work, sleep testing, or neuropsychological testing are actually needed.

How Doctors Test Trouble Concentrating: ADHD, Anxiety, Sleep Loss, or Something...

Learn how long neuropsychological testing usually takes, what happens before and during the appointment, which tasks are included, and when results and recommendations typically follow.

How Long Neuropsychological Testing Takes and What to Expect

Learn how sleep apnea can imitate ADHD, depression, and brain fog, which symptoms overlap most, and when sleep testing may reveal the real cause.

How Sleep Apnea Can Mimic ADHD, Depression, and Brain Fog

Learn how to prepare for neuropsychological testing, including sleep, food, medications, what to bring, what happens during the appointment, and how to avoid common mistakes that can affect results.

How to Prepare for Neuropsychological Testing

How to Read Cognitive Test Scores: MoCA, MMSE, and Mini-Cog Explained

Learn how to read mental health test results, including common score ranges for depression, anxiety, PTSD, bipolar, and substance screens, what cutoff scores mean, and when results need follow-up.

How to Read Mental Health Test Results: What Common Scores Mean

Learn how to read neuropsychological test results, understand percentiles and standard scores, and see what low, average, and impaired findings really mean in a full report.

How to Read Neuropsychological Test Results: What the Scores Mean

Learn what the ImPACT test measures in concussion assessment, how baseline and post-injury scores are used, what the results mean, and why the test should never be used alone.

ImPACT Test: What It Measures in Concussion Assessment

Learn how doctors screen chronic insomnia, which questionnaires and sleep diaries they use, when sleep studies are needed, and what happens after an insomnia evaluation.

Insomnia Screening: How Doctors Evaluate Chronic Sleep Problems

Learn the real difference between IQ testing and neuropsychological testing, what each measures, when clinicians use them, and how to choose the right evaluation.

IQ Testing vs Neuropsychological Testing: What Is the Difference?

Learn what iron and ferritin tests can reveal about fatigue, brain fog, and restless legs, how to interpret common results, and when low ferritin may matter even without anemia.

Iron and Ferritin Testing for Fatigue, Brain Fog, and Restless Legs

Learn how learning disability testing works for dyslexia, dysgraphia, and dyscalculia, including what evaluations measure, how diagnosis is made, and what happens after results.

Learning Disability Testing: How Dyslexia, Dysgraphia, and Dyscalculia Are Diagnosed

Learn how Lewy body dementia is diagnosed, including symptom patterns, cognitive testing, MRI, sleep studies, biomarker tests, and how doctors distinguish it from Alzheimer’s and other conditions.

Lewy Body Dementia Testing: How It Is Diagnosed

Learn when a lumbar puncture is used in brain and cognitive testing, what spinal fluid can reveal, how the procedure works, and when a spinal tap helps diagnose memory loss, infection, inflammation, or dementia.

Lumbar Puncture (Spinal Tap): When It Is Used in Brain and...

Learn what an M-CHAT autism screening result really means, how scores are interpreted, what a positive screen does and does not show, and what usually happens next.

M-CHAT Autism Screening: What It Means and What Comes Next

Learn which medical conditions can mimic anxiety and depression, what warning signs to watch for, and how doctors evaluate symptoms before making a diagnosis.

Medical Conditions That Can Mimic Anxiety and Depression

Learn when memory loss in younger adults may need cognitive testing, which causes doctors consider first, what the workup includes, and what happens after results come back.

Memory Loss in Younger Adults: When Cognitive Testing Is Needed and...

Learn when memory testing for seniors is worth scheduling, how to tell normal aging from cognitive decline, which tests doctors use, and what happens after the results.

Memory Testing for Seniors: When to Get Checked

Learn how memory tests for dementia work, which cognitive screening tools doctors use, how scores are interpreted, and what happens after an abnormal result.

Memory Tests for Dementia: How Cognitive Screening Works

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