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Learn how HLA-DR and CD38 flow cytometry measures activated T cells, what high results may mean, why ranges vary, and how clinicians plan follow-up.

Activated T-Cell Marker Test: HLA-DR, CD38, Immune Activation, and Inflammation

Understand how CD19 and CD20 B-cell counts are measured, why results may be high or low, how anti-CD20 therapy affects them, and which follow-up tests assess antibody function.

B-Cell Count Test: CD19, CD20, Immune Function, and Antibody Production

Learn what a CD4 count measures, how HIV affects helper T cells, what common ranges and thresholds mean, why results fluctuate, and how the test guides monitoring and infection prevention.

CD4 Count Test: Helper T Cells, Immune Function, HIV Monitoring, and Meaning

Learn how the CD4/CD8 ratio is calculated, what low or high results may mean, why an inverted ratio is nonspecific, and how the test adds context in HIV and immune monitoring.

CD4/CD8 Ratio Test: Immune Balance, High and Low Ratio, and Meaning

Learn what a CD8 count measures, why cytotoxic T-cell numbers may rise or fall, how viral infections affect results, and why cell quantity does not equal antiviral function.

CD8 Count Test: Cytotoxic T Cells, Immune Function, and Viral Response

Understand what a chemokine panel measures, why immune-signaling and cell-migration markers rise or fall, and how specialists interpret patterns and limitations.

Chemokine Panel Test: Immune Signaling, Inflammation, and Cell Migration Markers

Diagnostics

Home Diagnostics Page 69

Learn what the Epworth Sleepiness Scale measures, how ESS scoring works, when doctors use it, and what a high score may mean in sleep apnea, narcolepsy, and daytime sleepiness workups.

Epworth Sleepiness Scale: What It Measures and When Doctors Use It

Learn what executive function testing measures, which tests are commonly used, when clinicians order them, and what the results can and cannot tell you.

Executive Function Testing: What It Measures and When It Is Used

Learn what tests and assessments are done in a first-episode psychosis evaluation, including history, labs, toxicology, brain imaging, EEG, and safety assessment.

First-Episode Psychosis Evaluation: What Tests and Assessments Are Done

Learn how frontotemporal dementia is diagnosed through symptom patterns, family history, neuropsychological testing, MRI and PET imaging, biomarkers, genetics, and careful rule-out of lookalike conditions.

Frontotemporal Dementia Testing: How It Is Diagnosed

Learn what a GAD-7 anxiety score means, how the 0 to 21 scale works, what the common score ranges suggest, and what usually happens after screening.

GAD-7 Anxiety Test: What Your Score Means

Learn what happens during genetic counseling before brain or dementia testing, who should consider it, which genes may be discussed, and how results can affect diagnosis and family decisions.

Genetic Counseling Before Brain or Dementia Testing: What to Expect

Learn when genetic testing for brain and mental health conditions is truly useful, where it helps most in dementia and neurodevelopmental disorders, and why routine psychiatric genetic testing is often limited.

Genetic Testing for Brain and Mental Health Conditions: When It Is...

Learn who home sleep apnea testing is best for, what it can detect, what it can miss, and when an in-lab sleep study is the better choice.

Home Sleep Apnea Testing: Who It Is For and What It...

Learn which hormone tests doctors use for mood changes, brain fog, and fatigue, including thyroid, testosterone, menopause-related testing, prolactin, cortisol, and common non-hormonal causes.

Hormone Testing for Mood Changes, Brain Fog, and Fatigue

Learn how doctors evaluate memory loss, forgetfulness, and mental confusion using history, cognitive testing, lab work, brain imaging, and differential diagnosis to identify both urgent and long-term causes.

How Doctors Evaluate Memory Loss, Forgetfulness, and Mental Confusion

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

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