Hypercalcemia Diagnostic Approach: PTH-Dependent vs PTH-Independent Causes
Learn a stepwise hypercalcemia diagnostic approach using PTH, ionized calcium, PTHrP, vitamin D, malignancy clues and other major causes.
Learn how to evaluate high PTH with normal calcium, exclude secondary hyperparathyroidism, diagnose normocalcemic PHPT and understand management.
Learn familial hypocalciuric hypercalcemia (FHH), CaSR physiology, urinary calcium, CCCR, genetics and how to distinguish FHH from primary hyperparathyroidism.
Primary Hyperparathyroidism Explained: Calcium, PTH, Phosphate, Diagnosis and Management
Learn primary hyperparathyroidism, PTH and calcium physiology, diagnosis, FHH differentiation, kidney and bone complications, surgery and treatment.
X-Linked Hypophosphatemia Explained: PHEX, FGF23, Diagnosis and Treatment
Learn X-linked hypophosphatemia (XLH), PHEX and FGF23 physiology, childhood and adult features, diagnosis, renal phosphate wasting and treatment.
Tumor-Induced Osteomalacia Explained: Diagnosis, FGF23 Testing, Tumor Localization and Treatment
Learn tumor-induced osteomalacia (TIO), its FGF23 laboratory pattern, renal phosphate wasting, tumor localization, imaging and treatment principles.
FGF23 Disorders Explained: Tumor-Induced Osteomalacia, XLH and Hypophosphatemic Disorders
Learn FGF23 physiology, FGF23-mediated hypophosphatemia, XLH, tumor-induced osteomalacia, renal phosphate wasting, diagnosis and treatment principles.
Secondary Hyperparathyroidism Explained: Causes, CKD, Calcium, Phosphate and Treatment
Learn secondary hyperparathyroidism, why PTH rises in CKD and vitamin D deficiency, calcium and phosphate patterns, tertiary HPT and treatment principles.
Vitamin D Metabolism Explained: Synthesis, Activation, PTH, Calcium and Phosphate
Learn vitamin D metabolism from skin and diet to liver 25-OH vitamin D and kidney calcitriol, including PTH, FGF23, calcium, phosphate, bone and CKD physiology.
Vitamin D Deficiency Explained: Causes, Diagnosis, Secondary Hyperparathyroidism and Treatment
Learn vitamin D deficiency causes, diagnosis, 25-OH vitamin D testing, calcium, phosphate and PTH changes, osteomalacia risk and treatment principles.
Osteomalacia Explained: Causes, Laboratory Patterns, Diagnosis and Treatment
Learn osteomalacia causes, symptoms, laboratory patterns, vitamin D and phosphate disorders, Looser zones, diagnosis, osteoporosis differences and treatment.
Renal Phosphate Wasting Explained: TRP, FEPO4, TmP/GFR, FGF23 and Hypophosphatemia
Learn how to diagnose renal phosphate wasting using TRP, FEPO4 and TmP/GFR, distinguish renal from nonrenal hypophosphatemia, and interpret FGF23.
Diabetes Insipidus Explained: Central vs Nephrogenic DI, Diagnosis and Treatment
Learn diabetes insipidus from first principles including AVP deficiency, AVP resistance, hypotonic polyuria, central vs nephrogenic DI, diagnosis and treatment principles.
Calcium Homeostasis Explained: PTH, Vitamin D, Bone and Kidney Regulation
Learn calcium homeostasis from first principles including ionized vs total calcium, albumin effects, CaSR, PTH, vitamin D, kidney, bone and calcium-phosphate regulation.
Hypocalcemia Explained: Causes, Symptoms, ECG Changes, Diagnosis and Treatment
Learn hypocalcemia causes, symptoms, ECG changes, PTH-based diagnosis, ionized calcium, vitamin D and magnesium effects, and treatment principles.
Hypercalcemia Explained: Causes, Symptoms, PTH-Based Diagnosis and Treatment
Learn hypercalcemia causes, symptoms, PTH-based diagnosis, malignancy and hyperparathyroidism patterns, ECG changes and treatment principles.
Magnesium Homeostasis Explained: Absorption, Renal Handling and Regulation
Learn magnesium homeostasis, intestinal absorption, renal Mg2+ handling, TAL and DCT reabsorption, TRPM6, and links with potassium and calcium.
Hypomagnesemia Explained: Causes, Symptoms, ECG Changes, Diagnosis and Treatment
Learn hypomagnesemia causes, symptoms, ECG effects, renal vs GI magnesium loss, FEMg, hypokalemia, hypocalcemia and treatment principles.
Hypermagnesemia Explained: Causes, Symptoms, ECG Changes, Diagnosis and Treatment
Learn hypermagnesemia causes, symptoms, ECG effects, magnesium toxicity, renal failure risk, hyporeflexia, calcium treatment and dialysis principles.
Phosphate Homeostasis Explained: PTH, FGF23, Vitamin D and Renal Regulation
Learn phosphate homeostasis through renal phosphate handling, PTH, FGF23, calcitriol, NaPi transporters, bone and intestinal phosphate absorption.
Hypophosphatemia Explained: Causes, Symptoms, Renal Phosphate Wasting, Diagnosis and Treatment
Learn hypophosphatemia causes, symptoms, ATP effects, refeeding, respiratory alkalosis, renal phosphate wasting, urinary phosphate interpretation and treatment principles.
Hyperphosphatemia Explained: Causes, Calcium Effects, CKD, Diagnosis and Treatment
Learn hyperphosphatemia causes, CKD phosphate retention, calcium and PTH effects, tumor lysis, rhabdomyolysis, phosphate binders and treatment principles.
CKD-Mineral and Bone Disorder Explained: Phosphate, Calcium, PTH, Vitamin D and FGF23
Learn CKD-mineral and bone disorder, including phosphate retention, FGF23, calcitriol, PTH, renal osteodystrophy, vascular calcification and treatment principles.
Urine Osmolality Explained: Interpretation, ADH and Clinical Use
Learn how to interpret urine osmolality in hyponatremia, hypernatremia, polyuria, SIADH and diabetes insipidus using renal water physiology.
SIADH Explained: Diagnosis, Causes, Urine Osmolality and Treatment
Learn SIADH from first principles including inappropriate antidiuresis, hypotonic hyponatremia, urine osmolality, urine sodium, causes, mimics and treatment principles.
Hypernatremia Explained: Causes, Diagnosis, Water Deficit and Treatment
Learn hypernatremia from first principles including causes, symptoms, diagnosis, urine osmolality, diabetes insipidus patterns, free-water deficit and safe treatment principles.
Serum Osmolality Explained: Calculation, Tonicity and Clinical Interpretation
Learn serum osmolality from first principles including measured vs calculated osmolality, formulas, tonicity, effective osmoles, osmolal gap and hyponatremia interpretation.
Hyponatremia Explained: Causes, Diagnosis, Symptoms and Treatment
Learn hyponatremia from first principles including causes, symptoms, hypotonic vs non-hypotonic hyponatremia, urine osmolality, urine sodium, SIADH and safe treatment principles.
Sodium Homeostasis Explained: How the Body Controls Sodium, Water and Osmolality
Learn sodium homeostasis from first principles including serum sodium, total-body sodium, water balance, osmolality, tonicity, ADH, kidneys and volume regulation.
ECG Changes in Potassium Disorders: Hypokalemia and Hyperkalemia Explained
Learn ECG changes in potassium disorders including hypokalemia U waves, hyperkalemia peaked T waves, QRS widening, sine-wave morphology and clinical interpretation.
Potassium Replacement Explained: Oral vs IV Potassium, Monitoring and Safety
Learn safe potassium replacement including indications, oral versus intravenous potassium, monitoring, magnesium correction and common clinical scenarios.
Hypokalemia Explained: Causes, Symptoms, ECG Changes and Diagnosis
Learn hypokalemia step by step including low potassium causes, pathophysiology, symptoms, ECG changes, urinary potassium, acid-base clues and treatment principles.
Hyperkalemia Explained: Causes, Symptoms, ECG Changes and Diagnosis
Learn hyperkalemia from first principles including high potassium causes, pathophysiology, symptoms, ECG changes, pseudohyperkalemia and treatment principles.
Electrolytes Explained: Physiology, Functions and Clinical Interpretation
Learn the physiology, functions and clinical interpretation of sodium, potassium, calcium, magnesium and phosphate with a systematic approach to electrolyte disorders.
Potassium Homeostasis Explained: Physiology, Regulation and Clinical Importance
Learn potassium homeostasis with a complete guide to potassium physiology, intracellular distribution, Na+/K+-ATPase, renal regulation and clinical significance.
Acid-Base Compensation Explained: Respiratory, Renal Compensation & ABG Rules
Understand acid-base compensation with physiology, respiratory and renal compensation, Winter's formula, expected compensation rules and practical ABG interpretation.
Mixed Acid-Base Disorders Explained: Systematic ABG Interpretation
Learn how to diagnose mixed acid-base disorders using compensation rules, the anion gap, delta ratio and systematic ABG interpretation with clinical examples.
Respiratory Acidosis Explained: Causes, ABG Interpretation, Compensation & Management
Learn respiratory acidosis step by step. Understand carbon dioxide physiology, causes, ABG findings, acute vs chronic disease, compensation, diagnosis and management.
Respiratory Alkalosis Explained: Causes, ABG Interpretation, Compensation & Management
Learn respiratory alkalosis step by step including hyperventilation, carbon dioxide physiology, ABG interpretation, renal compensation, causes and management.
Metabolic Alkalosis Explained: Causes, ABG Interpretation and Diagnostic Approach
Learn metabolic alkalosis step by step including causes, ABG findings, chloride-responsive vs chloride-resistant alkalosis, urine chloride interpretation, respiratory compensation and clinical approach.
ABG Interpretation Explained: Step-by-Step Arterial Blood Gas Analysis
Learn ABG interpretation step-by-step including pH, PaCO2, HCO3, compensation, anion gap, Winter's Formula, Delta Ratio and worked clinical examples.
Anion Gap Explained: Formula, Normal Values, Albumin Correction and Clinical Interpretation
Learn the anion gap step-by-step including the formula, normal values, unmeasured anions, albumin correction, high anion gap metabolic acidosis and clinical interpretation.
Winter's Formula Explained: Expected PaCO2, Compensation and ABG Interpretation
Learn Winter's Formula step-by-step including expected PaCO2 calculation, respiratory compensation in metabolic acidosis, mixed disorders and ABG interpretation.
Delta Ratio Explained: Formula, Delta Gap and Mixed Metabolic Disorders
Learn the Delta Ratio step-by-step including the formula, interpretation, mixed metabolic disorders, high anion gap metabolic acidosis and worked clinical examples.
Acid-Base Disorders Explained: Acidosis, Alkalosis and ABG Interpretation
Learn acid-base disorders step-by-step including pH, bicarbonate, PaCO2, metabolic and respiratory disorders, compensation, ROME memory aid and basic ABG interpretation.
Metabolic Acidosis Explained: Causes, Anion Gap, Compensation and ABG Interpretation
Learn metabolic acidosis step-by-step including low bicarbonate, high and normal anion gap metabolic acidosis, GOLDMARK, compensation, Winter's Formula and ABG interpretation.