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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 72

Learn what an overnight sleep study records, how polysomnography is used for sleep apnea and other sleep disorders, what happens during testing, and how results are interpreted.

Polysomnography: What a Sleep Study Measures

Learn what the EPDS can and cannot show, how postpartum depression screening is interpreted, what follow-up assessment usually includes, and which symptoms need urgent care.

Postpartum Depression Screening: EPDS, Follow-Up Assessment, and What Happens Next

Learn when to see a psychiatrist, psychologist, or neuropsychologist, including who diagnoses depression, ADHD, memory problems, brain injury, and complex cognitive changes.

Psychiatrist vs Psychologist vs Neuropsychologist: Who Diagnoses What?

Learn what psychoeducational testing actually covers, which school and behavior concerns it can clarify, how school-based and private evaluations differ, and how parents can use the results to support a child more effectively.

Psychoeducational Testing: What It Is, What It Includes, and When a...

Learn what a psychosis evaluation includes, how doctors assess hallucinations and delusions, what tests may be ordered, and when symptoms require urgent care.

Psychosis Evaluation: How Doctors Assess Hallucinations, Delusions, and Disorganized Thinking

Learn how PTSD screening works, which tools doctors use, what a positive result means, and how screening differs from a full PTSD diagnosis.

PTSD Screening: How Doctors Test for Trauma and PTSD

Learn how doctors separate PTSD from anxiety disorders by looking at trauma history, intrusive symptoms, avoidance, screening tools, overlapping signs, and treatment implications.

PTSD vs Anxiety Disorder: How Doctors Tell the Difference

Understand what qEEG brain mapping measures, where it may have real clinical value, why many claims go too far, and what questions to ask before paying for the test.

qEEG Brain Mapping: What It Is, What It Claims, and What...

Learn what the SAGE test checks, how it is scored, what the results may suggest, how it compares with other memory screens, and what follow-up usually comes next.

SAGE Test for Memory Loss: What It Measures and How It...

Understand what school teams usually review, which tests are commonly used for ADHD and learning concerns, how results may lead to an IEP or 504 plan, and when outside evaluation may still be helpful.

School-Based ADHD and Learning Evaluations: What Testing Usually Includes

Understand what the SCOFF questionnaire checks, how its score is interpreted, what a positive result means, and when eating disorder symptoms need follow-up or urgent care.

SCOFF Eating Disorder Test: What It Measures and What Results Mean

Understand how brief mental health screens differ from full diagnosis, what questionnaires can and cannot show, and what usually happens after a positive result.

Screening vs Diagnosis in Mental Health: What Is the Difference?

Understand how doctors separate chronic sleep loss from ADHD by comparing symptoms, developmental history, daytime sleepiness, sleep testing, and the signs that point to one condition, the other, or both.

Sleep Deprivation vs ADHD: How Doctors Tell the Difference

Learn when a sleep study helps with brain fog, fatigue, and poor concentration, which test may be ordered, what the results can show, and when other evaluations should come first.

Sleep Study for Brain Fog, Fatigue, and Poor Concentration

Learn why sleep-deprived EEGs are used, how to prepare, what happens during the test, what the results may mean, and when further seizure evaluation is needed.

Sleep-Deprived EEG: Why It Is Done and What to Expect

Learn what the SLUMS test checks, how its education-adjusted score ranges are interpreted, how it compares with MoCA and MMSE, and what a low result usually leads to next.

SLUMS Test: What It Measures, Scoring, and What Results Mean

Compare SLUMS, MoCA, and MMSE for older adults, including what each test measures, which one catches milder decline best, and what abnormal results should lead to next.

SLUMS vs MoCA vs MMSE: Which Cognitive Test Is Best for...

Understand how doctors screen for social anxiety disorder, which questionnaires may be used, how diagnosis is confirmed, and what a positive result usually means.

Social Anxiety Screening: How Doctors Test for Social Anxiety Disorder

Learn what a brain SPECT scan measures, when doctors use it for epilepsy, dementia, and other neurologic questions, how it compares with MRI and PET, and what its limits mean for real-world diagnosis.

SPECT Scan for Brain Disorders: What It Shows and When It...

Learn how the STOP-Bang Questionnaire screens for sleep apnea, how scores are interpreted, what a positive result usually leads to, and where the tool’s limits matter most.

STOP-Bang Questionnaire: Sleep Apnea Screening, Scores, and What Results Mean

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