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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 66

Learn how AI is being used in cognitive testing, from digital drawing and speech analysis to remote monitoring, along with the benefits, risks, and limits that still matter.

AI in Cognitive Testing: How New Tools Are Being Used

Learn what AI can really do in mental health diagnosis, where it helps clinicians, why it still falls short, and how to judge AI screening, chatbot, and diagnostic tools safely.

AI in Mental Health Diagnosis: What It Can Do, What It...

Learn how doctors screen for problem drinking, which alcohol screening tests they use, what a positive result means, and what usually happens after alcohol use screening.

Alcohol Use Screening: How Doctors Test for Problem Drinking

Learn what an Alzheimer’s workup includes, from history, cognitive testing, labs, and MRI to biomarker tests such as amyloid blood tests and PET scans, and how doctors reach the diagnosis.

Alzheimer’s Testing and Diagnosis: What the Workup Looks Like

Learn what amyloid blood tests show, who they are for, how results are interpreted, and how they compare with PET scans and spinal fluid testing.

Amyloid Blood Tests: What They Show and Who They Are For

Learn what an amyloid PET scan shows, when doctors use it in Alzheimer’s diagnosis, how to interpret positive and negative results, and how it compares with blood tests, MRI, CSF, and tau PET.

Amyloid PET Scan: How It Helps in Alzheimer’s Diagnosis

Learn how doctors screen for anxiety disorders using tools like the GAD-2 and GAD-7, clinical questions, and follow-up evaluation to decide what symptoms may need treatment.

Anxiety Screening: How Doctors Screen for Anxiety Disorders

Learn how doctors tell anxiety from ADHD by comparing symptoms, triggers, timeline, testing, and overlap so the right diagnosis and treatment are easier to understand.

Anxiety vs ADHD: How Doctors Tell the Difference

Learn what APOE genetic testing for Alzheimer’s risk can and cannot tell you, how to interpret e2, e3, and e4 results, and when genetic counseling matters most.

APOE Genetic Testing for Alzheimer’s Risk: What It Can and Cannot...

Learn what the ASQ suicide screening tool measures, where it is used, what a positive screen means, and how it fits into clinical suicide risk assessment and next-step safety planning.

ASQ Suicide Screening: What It Measures and When It Is Used

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...

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