Latest

Understand ALK fusion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

ALK Fusion Test for Lung Cancer: Gene Fusion, Positive Result, and Molecular Meaning

Understand BRAF V600E testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

BRAF V600E Test for Lung Cancer: Mutation Status, Positive Result, and Molecular Meaning

Learn how the carcinoembryonic antigen (CEA) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CEA Test for Lung Cancer: Tumor Marker Monitoring, High Levels, and Result Meaning

Learn how the cytokeratin 19 fragment 21-1 (CYFRA 21-1) test is used in lung cancer, what high levels can mean, common non-cancer causes, reference ranges, and why serial trends matter.

CYFRA 21-1 Test for Lung Cancer: Tumor Marker Levels and Disease Monitoring

Understand EGFR exon 20 insertion testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Exon 20 Insertion Test: Lung Cancer Mutation Status and Molecular Meaning

Understand EGFR mutation testing in lung cancer, including what a positive or negative result means, tissue and ctDNA methods, limitations, and treatment relevance.

EGFR Mutation Test for Lung Cancer: Exon 19, L858R, T790M, Mutation Status, and...

Diagnostics

Home Diagnostics Page 31

Learn what a relaxin blood test measures in pregnancy, why routine testing is uncommon, how pelvic changes are assessed, and what low or high research results may mean.

Relaxin Blood Test: Pregnancy Hormone, Pelvic Changes, and Results

Understand acromegaly blood testing, including IGF-1, random growth hormone, oral glucose suppression, result patterns, confounders, and follow-up steps.

Acromegaly Blood Test Panel: IGF-1, Growth Hormone, Oral Glucose Suppression, and...

Learn how an ACTH blood test is interpreted with cortisol, including high and low patterns, pituitary and adrenal causes, preparation, follow-up tests, and urgent symptoms.

ACTH Blood Test: High, Low, Pituitary Function, and Adrenal Results

Understand ADH blood testing for water balance, including low and high vasopressin patterns, diabetes insipidus, osmolality, copeptin, collection limits, and next steps.

Antidiuretic Hormone (ADH) Test: Water Balance, Diabetes Insipidus, and Results

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,...

1...303132...93 Page 31 of 93