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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 12

Learn how a central hypothyroidism panel uses free T4, TSH, cortisol, other pituitary hormones, and imaging to diagnose and monitor pituitary-related thyroid deficiency.

Central Hypothyroidism Test Panel: TSH, Free T4, Pituitary Function, and Results

Understand how a copeptin blood test serves as an ADH surrogate, how baseline and stimulated results distinguish diabetes insipidus from primary polydipsia, and what can affect interpretation.

Copeptin Blood Test: ADH Surrogate Marker, Diabetes Insipidus, and Results

Learn how a diabetes insipidus test panel combines copeptin, ADH, serum sodium, plasma osmolality, urine osmolality, and dynamic testing to identify water-balance disorders.

Diabetes Insipidus Hormone Test Panel: Copeptin, ADH, Serum Osmolality, Urine Osmolality,...

Learn how an FSH blood test reflects pituitary and gonadal function, what high or low results can mean, how cycle timing affects ranges, and why fertility interpretation requires related tests.

Follicle-Stimulating Hormone (FSH) Test: Pituitary Function, Fertility, and Results

Learn how a pediatric growth failure panel combines growth velocity, IGF-1, IGFBP-3, GH stimulation, bone age, and pituitary evaluation to distinguish GH deficiency from other causes.

Growth Failure Hormone Test Panel: IGF-1, IGFBP-3, GH Stimulation, and Results

Learn why random GH levels are difficult to interpret, how stimulation and suppression tests define low or high growth hormone, and which age-, assay-, and protocol-specific results guide diagnosis.

Growth Hormone (GH) Test: High, Low, Normal Range, and Results

Learn how a growth hormone stimulation test measures GH reserve, how insulin, glucagon, arginine, clonidine, and macimorelin protocols differ, and how peak levels are interpreted.

Growth Hormone Stimulation Test: GH Deficiency, Peak Levels, and Results

Learn how a GH suppression test uses oral glucose and serial growth hormone measurements to evaluate acromegaly, interpret the nadir, and resolve discordant IGF-1 and GH results.

Growth Hormone Suppression Test: Acromegaly, GH Levels, and Results

Learn how a hypopituitarism blood panel evaluates ACTH-cortisol, TSH-free T4, LH-FSH, sex hormones, IGF-1, prolactin, and water balance, and why replacement sequence matters.

Hypopituitarism Blood Test Panel: Pituitary Hormones, Low Levels, and Results

Learn how the IGFBP-3 blood test reflects growth hormone function, why levels may be low or high, how pediatric ranges change, and what follow-up results mean.

IGF-Binding Protein 3 (IGFBP-3) Test: Growth Hormone Function and Results

Understand IGF-1 test results, age-based normal ranges, causes of high or low levels, growth hormone disorders, acromegaly screening, and follow-up testing.

Insulin-Like Growth Factor 1 (IGF-1) Test: High, Low, Normal Range, and...

Learn how an LH blood or urine test assesses pituitary function, ovulation, testosterone, puberty, and fertility, including causes of high and low results.

Luteinizing Hormone (LH) Test: Pituitary Function, Ovulation, Testosterone, and Results

Learn how macroprolactin testing explains false prolactin elevation, how PEG and post-PEG results are interpreted, and when true hyperprolactinemia still needs follow-up.

Macroprolactin Test: High Prolactin, False Elevation, and Results

Learn how the oral glucose growth hormone suppression test screens for acromegaly, including preparation, the 75 g protocol, GH nadir cutoffs, and next steps.

Oral Glucose Growth Hormone Suppression Test: Acromegaly Screening and Results

Learn what an oxytocin blood test can and cannot show, why normal ranges are uncertain, how assays differ, and how oxytocin functions in labor, lactation, and the brain.

Oxytocin Blood Test: Hormone Levels, Function, and Results

Understand a pituitary hormone panel including ACTH, TSH, LH, FSH, prolactin, GH, and IGF-1, with result patterns, timing, pitfalls, and follow-up tests.

Pituitary Hormone Test Panel: ACTH, TSH, LH, FSH, Prolactin, GH, IGF-1,...

Learn how a pituitary tumor hormone panel evaluates prolactin, ACTH, cortisol, GH, IGF-1, TSH, LH, and FSH for secreting tumors, deficiencies, and mass effects.

Pituitary Tumor Hormone Panel: Prolactin, ACTH, GH, IGF-1, TSH, LH, FSH,...

Understand prolactin blood test results, including high and low levels, normal ranges, medicine effects, macroprolactin, prolactinoma, pituitary tumors, and follow-up testing.

Prolactin Blood Test: High, Low, Normal Range, Pituitary Tumor, and Results

Learn how to interpret TSH with free T4 across the pituitary-thyroid axis, including primary thyroid disease, central hypothyroidism, TSHoma, assay interference, and treatment monitoring.

Thyroid-Stimulating Hormone (TSH) Test: Pituitary-Thyroid Axis and Results

Learn what an adiponectin blood test measures, why low levels may accompany insulin resistance, how ranges vary, and what high or abnormal results can mean.

Adiponectin Blood Test: Low Levels, Insulin Resistance, and Results

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