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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 50

Learn what the ASRS ADHD test measures, how ASRS scoring works, what a positive screen means, and when to seek a full adult ADHD evaluation.

ASRS ADHD Test: What It Measures and What Results Mean

Learn what at-home cognitive tests can and cannot tell you, how accurate home memory and thinking screens really are, and when a concerning result should lead to professional evaluation.

At-Home Cognitive Tests: What They Can and Cannot Tell You

Learn the difference between AUDIT and AUDIT-C, how each alcohol screening test is scored, when doctors use one over the other, and what a positive result actually means.

AUDIT vs AUDIT-C: Alcohol Screening Tests Explained

Learn the early signs of autism in toddlers, when screening happens, which tests are commonly used, and what a positive autism screen means for next steps and evaluation.

Autism Screening in Toddlers: Early Signs and Common Tests

Learn how autism testing in adults works, what a full adult autism evaluation includes, which tools clinicians use, and how doctors separate autism from overlapping conditions.

Autism Testing in Adults: How Adult Autism Is Diagnosed

Learn what a full autism evaluation in children includes, from screening and developmental history to ADOS, language and cognitive testing, differential diagnosis, and next-step recommendations.

Autism Testing in Children: What the Full Diagnostic Workup Looks Like

Learn how doctors tell the difference between autism and ADHD, where symptoms overlap, when both can occur, and what a full evaluation looks at.

Autism vs ADHD: How Doctors Tell the Difference

Learn when baseline concussion testing for athletes is useful, when it adds little, what a preseason concussion baseline includes, and why no single test should decide return to play.

Baseline Concussion Testing for Athletes: When It Helps, When It Doesn’t,...

Learn what behavioral health screening in schools involves, how consent and privacy usually work, what happens after a positive screen, and what students and parents should expect.

Behavioral Health Screening in Schools: What Students and Parents Should Expect

Learn what counts as a biomarker in brain and mental health, how different biomarker types work, where they already help clinicians, and why psychiatry remains more complex.

Biomarkers in Brain and Mental Health: What Counts as a Biomarker...

Learn how doctors screen for bipolar symptoms, which bipolar screening tools they use, what a positive screen means, and how bipolar disorder is separated from look-alike conditions.

Bipolar Disorder Screening: How Doctors Screen for Bipolar Symptoms

Learn how doctors tell bipolar disorder from ADHD by looking at episodic mood changes, lifelong attention patterns, sleep, impulsivity, rating scales, overlap, and co-occurring conditions.

Bipolar Disorder vs ADHD: How Doctors Tell the Difference

Learn what blood biomarker tests for Alzheimer’s disease are available, what amyloid, pTau, NfL, and GFAP can show, and how doctors interpret the results.

Blood Biomarker Tests for Alzheimer’s Disease: What Is Available, What They...

Learn how blood sugar and A1C testing can help evaluate brain fog, mental slowing, and cognitive symptoms, what the results mean, and when glucose testing should lead to broader medical follow-up.

Blood Sugar and A1C Testing for Brain Fog and Cognitive Symptoms

Learn which blood tests doctors commonly order for brain fog, what those labs can and cannot show, and when normal results mean the next step should be sleep, medication, or neurological evaluation.

Blood Tests for Brain Fog: What Doctors Usually Check

Learn which blood tests doctors commonly order when evaluating depression and anxiety, what medical causes they help rule out, and why normal labs do not rule out a real mental health condition.

Blood Tests for Depression and Anxiety: Medical Causes Doctors Rule Out

Learn which blood tests are commonly ordered for memory loss, what routine labs can reveal, when extra testing is needed, and how Alzheimer blood biomarkers fit into a modern cognitive workup.

Blood Tests for Memory Loss: Common Labs in Cognitive Workups

Learn how doctors assess borderline personality disorder, which symptoms they evaluate, how BPD is separated from trauma and bipolar disorder, and what happens after a full clinical assessment.

Borderline Personality Disorder Assessment: How Doctors Evaluate BPD Symptoms

Learn when a brain CT scan is used, what it can detect, what it may miss, how it compares with MRI, and what to expect before, during, and after the scan.

Brain CT Scan: When It Is Used and What It Can...

Learn how doctors evaluate brain fog and poor concentration, including history, cognitive testing, blood work, imaging, sleep evaluation, and next steps.

Brain Fog Testing: How Doctors Evaluate Brain Fog and Poor Concentration

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