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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 67

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

Learn when MRI or PET is used for memory loss, what each scan can show, how amyloid and tau PET differ, and why imaging is only one part of a full dementia workup.

Brain Imaging for Memory Loss: When MRI or PET Is Used

Learn what a brain MRI can show, when doctors order it, how it compares with CT, what contrast means, and what to expect before, during, and after the scan.

Brain MRI: What It Shows and When It Is Ordered

Learn which brain, cognitive, and mental health tests are commonly used in children, adults, and seniors, and how age changes screening, diagnosis, and next-step evaluation.

Brain, Cognitive, and Mental Health Tests by Age: Children, Adults, and...

A practical guide to brain, cognitive, and mental health tests by symptom, including memory loss, brain fog, anxiety, mood swings, poor focus, fatigue, and when doctors escalate testing.

Brain, Cognitive, and Mental Health Tests by Symptom: Memory Loss, Brain...

Learn what the CAGE alcohol screening test measures, how it is scored, when doctors use it, where it falls short, and how it compares with AUDIT and AUDIT-C.

CAGE Alcohol Screening: What It Means and When It Is Used

Learn what the CAM delirium test measures, how it is scored, when hospitals use it, how it differs from CAM-ICU, and what a positive result means in older adults.

CAM Delirium Test: What It Measures in Hospital and Older Adults

Can a brain scan show depression, anxiety, ADHD, or autism? Learn what MRI, PET, and other scans can reveal, why they are not routine diagnostic tests, and when doctors still order imaging.

Can a Brain Scan Show Depression, Anxiety, ADHD, or Autism?

Can mental health tests be wrong? Learn how false positives and false negatives happen, what affects accuracy, and what to do next after a confusing result.

Can Mental Health Tests Be Wrong? False Positives, False Negatives, and...

Can MRI diagnose mental illness? Learn what brain scans can reveal, when doctors order MRI for psychiatric symptoms, and why diagnosis still depends on clinical evaluation.

Can MRI Diagnose Mental Illness? What Brain Scans Can and Cannot...

Learn what families should expect from cognitive testing for older adults, including common memory tests, follow-up workups, how results are interpreted, and when sudden confusion needs urgent care.

Cognitive Testing for Older Adults: What Families Should Expect

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