·9 min
Lipoprotein(a) [Lp(a)]: Genetics, Aortic Valve Disease, and Cardiovascular Risk
A clinical diagnostic guide to Lipoprotein(a) [Lp(a)], kringle IV-2 genetics, measurement standardization (mg/dL vs nmol/L), and targeted risk mitigation.
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·8 min
Apolipoprotein B (ApoB-100) and ApoB / ApoA1 Ratio
A clinical diagnostic guide to Apolipoprotein B (ApoB-100), ApoA1, atherogenic particle number, discordance with LDL-C, and cardiovascular risk stratification.
·8 min
Oral Glucose Tolerance Test (OGTT 75g) and 2-Hour Postprandial Glucose
A clinical diagnostic reference on the 75g Oral Glucose Tolerance Test (OGTT) and 2-Hour Postprandial Glucose, dynamic insulin secretion phases, Impaired Glucose Tolerance (IGT), and gestational diabetes.
·8 min
Fasting C-Peptide: Clinical Assessment of Endogenous Beta-Cell Reserve
A clinical diagnostic reference on Fasting C-Peptide, proinsulin cleavage kinetics, distinguishing Type 1 vs Type 2 diabetes vs LADA, and investigating hypoglycemia.
·9 min
Glycated Hemoglobin (HbA1c) and eAG: Long-Term Glycemic Monitoring
A clinical diagnostic reference on Glycated Hemoglobin (HbA1c) and Estimated Average Glucose (eAG), non-enzymatic glycation, NGSP versus IFCC units, and red blood cell turnover confounders.
·8 min
Fasting Glucose, Fasting Insulin, and HOMA-IR: Assessing Metabolic Health
A clinical diagnostic reference on Fasting Plasma Glucose, Fasting Serum Insulin, and HOMA-IR calculation, evaluating occult insulin resistance and metabolic longevity.
·8 min
Free T4 and Free T3: Evaluating Active Thyroid Hormone Bioavailability
A clinical diagnostic reference on Free Thyroxine (Free T4) and Free Triiodothyronine (Free T3), deiodinase enzyme kinetics, reference intervals, and peripheral hormone conversion.
·7 min
Thyroid Autoantibodies: Diagnostic Guide to Anti-TPO and Anti-Thyroglobulin
A clinical diagnostic reference on Anti-Thyroid Peroxidase (Anti-TPO) and Anti-Thyroglobulin (TgAb) antibodies, autoimmune thyroiditis pathogenesis, reference cutoffs, and thyroglobulin monitoring.
·7 min
Thyroid-Stimulating Hormone (TSH): Diagnostic Evaluation of Pituitary-Thyroid Homeostasis
A clinical diagnostic guide to Thyroid-Stimulating Hormone (TSH) testing, evaluating pituitary regulation, logarithmic inverse dynamics, reference intervals, and subclinical thyroid screening.
·8 min
Metanephrines: Free Plasma & Urinary Metabolites in Pheochromocytoma & Paraganglioma
A clinical guide to metanephrines: catecholamine O-methylation, diagnostic superiority of free metabolites, LC-MS/MS testing, and tumor localization.
·10 min
Renin: Juxtaglomerular Physiology, Plasma Renin Activity (PRA), and Direct Concentration (DRC)
A clinical guide to renin: renal baroreceptor regulation, enzymatic cleavage of angiotensinogen, PRA vs. DRC assays, cryoactivation, and diagnostic workup.
·9 min
Aldosterone-to-Renin Ratio (ARR) & Renin: Clinical Protocol and Screening Guide
A clinical guide to the aldosterone-to-renin ratio (ARR) and plasma renin: RAAS physiology, cryoactivation avoidance, and screening for primary aldosteronism.
·10 min
Plasma Fractionated Free Metanephrines: Clinical Guide, Protocol, and Diagnostic Utility
A clinical guide to plasma fractionated free metanephrines: chromaffin cell catecholamine metabolism, supine collection protocols, and pheochromocytoma screening.
·7 min
Low-Dose Overnight Dexamethasone Suppression Test (1mg DST): Clinical Guide and Protocol
A clinical guide to the low-dose overnight dexamethasone suppression test: pituitary feedback inhibition, diagnostic cutoffs, and Cushing's syndrome screening.
·8 min
5-Hydroxyindoleacetic Acid (5-HIAA): Serotonin Catabolism and Carcinoid Biomarker Analysis
A comprehensive clinical reference on 5-HIAA: serotonin catabolism, enterochromaffin cell biology, neuroendocrine tumor diagnostics, and pre-analytical protocols.
·8 min
Adrenocorticotropic Hormone (ACTH): Pituitary Regulation and Diagnostic Utility
A clinical guide to adrenocorticotropic hormone: anterior pituitary synthesis, melanocortin 2 receptor activation, and endocrine differential diagnosis.
·8 min
Aldosterone: Renin-Angiotensin Regulation, Mineralocorticoid Physiology, and Reference Intervals
A comprehensive clinical reference on aldosterone: zona glomerulosa steroidogenesis, distal nephron electrolyte transport, and diagnostic workup of aldosteronism.
·8 min
Chromogranin A: Neuroendocrine Granule Secretion, Tumor Marker Dynamics, and Clinical Utility
A comprehensive clinical reference on Chromogranin A: neuroendocrine dense-core vesicle biology, tumor burden dynamics, and diagnostic evaluation.
·8 min
Cortisol: Physiological Role, Circadian Dynamics, and Clinical Reference Intervals
A comprehensive clinical reference on cortisol: adrenal steroidogenesis, glucocorticoid receptor signaling, optimal reference intervals, and diagnostic evaluation.
·9 min
Creatinine: Phosphocreatine Kinetics, Glomerular Filtration, and Renal Diagnostic Utility
A comprehensive clinical reference on creatinine: skeletal muscle phosphocreatine breakdown, glomerular filtration kinetics, eGFR equations, and 24-hour urine validation.
·8 min
DHEA-Sulfate: Adrenal Androgenesis, Biomarker of Aging, and Clinical Utility
A comprehensive clinical reference on DHEA-sulfate: zona reticularis androgenesis, biological conversion, age-related decline, and endocrine diagnostics.
·7 min
24-Hour Urine 5-HIAA: Diagnostic Biomarker for Carcinoid Syndrome
A clinical guide to 24-hour urine 5-hydroxyindoleacetic acid testing, evaluating serotonin turnover, neuroendocrine tumors, and dietary preparation protocols.
·7 min
Late-Night Salivary Cortisol: Evaluating Circadian Rhythm and Cushing's Syndrome
A clinical guide to late-night salivary cortisol testing, circadian nadir biology, Salivette collection protocols, and Endocrine Society diagnostic thresholds.
·7 min
24-Hour Urinary Free Cortisol (UFC): Diagnostic Standard for Cushing's Syndrome
A comprehensive clinical guide to 24-hour urinary free cortisol testing, evaluating hypercortisolemia, collection protocols, and Endocrine Society diagnostic thresholds.
·6 min
ACTH Stimulation Test: The Gold Standard in Adrenal Insufficiency Diagnostics
A clinical guide to the cosyntropin (Synacthen 250 mcg) stimulation test, evaluating adrenal cortical reserve, peak cortisol thresholds, and diagnostic protocols.
·6 min
Serum Cortisol: Clinical Measurement of the Morning Adrenal Peak
A clinical diagnostic guide to morning serum cortisol testing, evaluating adrenal axis function, reference intervals, circadian rhythmicity, and pre-test rest protocols.