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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 54

Learn how mental health screening differs for children, teens, adults, and seniors, which tools and concerns matter by age, and what a positive screening result really means.

Mental Health Screening for Children, Teens, Adults, and Seniors

Learn what mental health screening in primary care usually involves, which questionnaires are commonly used, how doctors interpret results, and what happens after a positive screen.

Mental Health Screening in Primary Care: What to Expect

Learn what mental health screening is, how common tools work, what scores really mean, and what usually happens after a positive or unclear result.

Mental Health Screening: What It Is, How It Works, and What...

Learn how doctors distinguish mild cognitive impairment from normal aging, which symptoms matter most, what cognitive testing shows, and when the workup points to something more serious.

Mild Cognitive Impairment vs Normal Aging: How Doctors Tell the Difference

Learn what the Mini-Cog test screens for, who should take it, how it works, what the results mean, and when a fuller memory evaluation is needed.

Mini-Cog Test: What It Screens For and Who Should Take It

Learn what the MMSE test measures, how its 30-point score is interpreted, when doctors use it, and where this common cognitive screening tool helps or falls short.

MMSE Test: What It Measures and When It Is Used

Learn what the MoCA test measures, how it is scored, what different score ranges can suggest, and why a low MoCA result should always be interpreted in full clinical context.

MoCA Test: What It Measures and What the Score Means

Compare MoCA, MMSE, and Mini-Cog in one clear guide. Learn which memory test is more sensitive, when each is used, and what happens after an abnormal result.

MoCA vs MMSE vs Mini-Cog: Key Differences in Memory Testing

Learn what the Mood Disorder Questionnaire screens for, how the MDQ is scored, what a positive result means, and why it cannot diagnose bipolar disorder on its own.

Mood Disorder Questionnaire (MDQ): What It Screens For and What Results...

Learn what MRI, CT, EEG, PET, sleep studies, and lab work actually show, when doctors order each test, and how these common brain tests fit into real diagnostic workups.

Most Common Brain Tests: MRI, CT, EEG, PET, Sleep Studies, and...

Learn what the most common cognitive tests measure, when doctors use Mini-Cog, MoCA, MMSE, SLUMS, and neuropsychological testing, and what abnormal results really mean.

Most Common Cognitive Tests: What They Measure and When They Are...

Learn which mental health screening tools are used most often, what PHQ-9, GAD-7, PC-PTSD-5, MDQ, ASQ, and other screeners measure, and what happens after a positive result.

Most Common Mental Health Screening Tools: What They Measure and When...

Learn when MRI is better than CT for brain symptoms, when CT should come first, and how doctors decide which scan makes the most sense in emergencies and routine workups.

MRI vs CT Scan for Brain Symptoms: Which Test Is Better...

Learn what the MSLT sleep test measures, how it is used for excessive daytime sleepiness, what results may suggest, and why preparation matters for narcolepsy and idiopathic hypersomnia evaluation.

MSLT Sleep Test: What It Measures for Excessive Daytime Sleepiness

Learn when neuropsychological testing is useful after concussion or brain injury, what it measures, when to do it, how results are interpreted, and how testing helps guide recovery.

Neuropsychological Testing After Concussion or Brain Injury

Learn when neuropsychological testing can help with ADHD, when it often does not add much, and what test results can and cannot actually prove.

Neuropsychological Testing for ADHD: When It Helps and When It Does...

Learn how neuropsychological testing helps clarify autism, learning problems, and executive dysfunction, what the evaluation includes, and how results guide diagnosis, accommodations, and next steps.

Neuropsychological Testing for Autism, Learning Problems, and Executive Dysfunction

Learn what neuropsychological testing for dementia and memory loss involves, what it measures, when doctors order it, and how it helps clarify diagnosis and next steps.

Neuropsychological Testing for Dementia and Memory Loss

Learn what neuropsychological testing measures, when it is needed, how it differs from simpler cognitive tests, and what the results can show for children, adults, and older adults.

Neuropsychological Testing: What It Measures and When It Is Needed

Learn how OCD screening works, what doctors ask about obsessions and compulsions, which tools they use, how they separate OCD from anxiety and other conditions, and what a positive screen means.

OCD Screening: How Doctors Assess Obsessions and Compulsions

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