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Nephrology: the medical specialty focused on kidney health and disease

Nephrology is the medical discipline that studies kidney function, diagnoses and treats kidney disorders, and manages therapies from medication and diet to dialysis and transplantation.

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Overview

Nephrology is the branch of medicine concerned with the kidneys: their normal physiology, common disorders, prevention and treatment. The word derives from the Greek nephros (kidney) and the suffix -logy. Nephrologists evaluate how well the kidneys filter blood, regulate fluids and electrolytes, and produce hormones that affect blood pressure and red blood cell production.

Core functions and clinical focus

Practitioners manage a range of problems, from acute kidney injury to long-term chronic kidney disease (CKD). Common clinical concerns include glomerular diseases, tubular disorders, nephrolithiasis (kidney stones), electrolyte imbalances and hypertension related to kidney dysfunction. Care involves interpretation of blood tests (including estimates of glomerular filtration), urinalysis, imaging and sometimes kidney biopsy.

Diagnosis, treatments and therapies

Treatment strategies begin with lifestyle and medical approaches: blood pressure control, dietary measures, medication adjustment and management of complications. When kidneys fail to sustain life-sustaining functions, renal replacement therapies are used. These include dialysis and kidney transplantation. Conservative care and coordination with other specialists are important when transplantation is not an option.

Typical tools and interventions

  • Laboratory monitoring: serum creatinine, electrolytes, proteinuria assessments.
  • Imaging: ultrasound and CT scans for structural evaluation.
  • Histology: percutaneous kidney biopsy for definitive diagnosis of many glomerular diseases.
  • Renal replacement: hemodialysis, peritoneal dialysis and transplantation.

History, training and distinctions

The specialty gained its modern name in the mid-20th century; before that, terms such as "kidney medicine" were common. Training typically follows internal medicine or pediatrics and includes focused education in renal physiology and therapeutics. Nephrology is distinct from urology: nephrologists treat kidney disease medically, while urologists manage surgical and structural problems of the urinary tract.

Importance and public health

Kidney disease has broad implications for cardiovascular health and overall wellbeing. Early detection and management slow progression of chronic disease and reduce complications. Pediatric nephrology addresses congenital and developmental disorders in children, while adult nephrology emphasizes chronic care, acute interventions and coordination for transplantation and long-term dialysis.

For further reading on terminology and specialized topics see kidney references and clinical resources at nephros-related literature or professional societies via medical portals.

Nephrology diagnoses

  • Systemic diseases with renal involvement and/or hypertension: Collagenoses (lupus erythematosus, scleroderma, CREST syndrome, dermatomyositis-polymyositis, Sjögren's syndrome, mixed collagenosis (Sharp syndrome)/undifferentiated collagenoses), Vasculitides (Takayasu syndrome, giant cell arteritis, panarteritis, Kawasaki syndrome, granulomatosis with polyangiitis (Wegener's disease), eosinophilic granulomatosis with polyangiitis (EGPA, Churg-Strauss syndrome), microscopic polyangiitis, Schoenlein-Henoch purpura, essential cryoglobulinemic vasculitis, Goodpasture syndrome), other systemic diseases (amyloidosis, Behçet's disease, familial Mediterranean fever, Raynaud's syndrome, hemolytic uremic syndrome, thrombotic thrombocytopenic purpura, HELLP syndrome).
  • Glomerular diseases that are not part of a systemic disease: Glomerulonephritis, Glomerular diseases without known histological diagnosis: acute nephritic syndrome, rapid-progressive glomerulonephritis, recurrent and persistent hematuria, chronic nephritic syndrome, nephrotic syndrome, isolated proteinuria secondary to tumor disease, infectious disease (incl. hepatitis) or gestational gestosis.
  • Tubulointerstitial diseases: Tubulointerstitial nephritis, obstructive uropathy and refluxuropathy, drug- and heavy metal-induced tubulointerstitial and tubular disease states, tubulointerstitial kidney disease in other diseases, other tubulointerstitial kidney diseases (for example, Balkan nephropathy, renal abscess, perinephritic abscess, analgesic nephropathy).
  • Nephrolithiasis (kidney stone disease)
  • Endogenous poisoning by uremic toxins and nephrotoxins
  • exogenous poisoning by various renal toxins (e.g. analgesic anphropathy)
  • Hereditary disorders: Alport syndrome, autosomal dominant or recessive cystic kidneys, Von Hippel-Lindau syndrome (Hippel-Lindau disease), nephronophthisis, tuberous sclerosis.
  • Tumor diseases: Renal cell carcinoma (kidney cancer), renal sarcoma and Wilms tumor (nephroblastoma), plasmocytoma (multiple myeloma) and malignant neoplasm of plasma cells, tumor lysis syndrome.
  • Acute kidney failure: Acute kidney injury (AKI) is a rapid decline in glomerular filtration rate. Acute kidney injury is defined as a rise in serum creatinine of at least 50% from a measured or presumed baseline level within seven days or a rise above a measured baseline level of at least 0.3 mg/dl within 48 hours. In addition, acute renal failure is present with a measured urine output of less than 0,5 ml/kg/h in six hours.
  • Chronic renal failure: According to the KDIGO recommendations, chronic renal disease exists if renal damage is present and/or the glomerular filtration rate (GFR) is less than 60 ml/min/1.73 m² for probably more than three months.
  • Acute kidney disease: Since for some patients with kidney disease neither the definition of ANV nor the definition of chronic kidney disease applies, the KDIGO working group proposes the definition of a further entity, the so-called "acute kidney disease" (AKD).
  • Concomitant diseases of chronic kidney disease: renal anemia, secondary hyperparathyroidism (sHPT), CKD-MBD ("Chronic Kidney Disease - Mineral Bone Disease"), uremic bleeding tendency, uremic encephalopathy, uremic pericarditis and neuropathy, nephrogenic systemic fibrosis (NSF)
  • Clinical conditions in renal disease: overhydration and exsiccosis, electrolyte disturbances, disturbances of the acid-base balance (acidosis, alkalosis), pruritus, thirst, malnutrition, uremia.
  • Metabolic disorders: Gout, hyperlipoproteinemia (HLP) or hyperlipidemia, obesity, protein metabolism disorders (hypoproteinemia, hypalbuminemia), diabetes mellitus.
  • Hypertension and vascular disease: Essential hypertension, secondary hypertension, gestational hypertension.
  • Diseases of the cardiovascular system concomitant with or as a consequence of kidney disease (cardiorenal syndrome, hepatorenal syndrome): coronary heart disease, angina pectoris, acute myocardial infarction, diseases of the heart valves, heart failure, peripheral arterial occlusive disease, thrombosis and embolism of the renal artery, thrombosis and embolism of the renal vein
  • Pulmonary complications: Pleural effusion and noncardiac pulmonary edema, congestive pneumonia...
  • Infections: Urethritis, tubulointerstitial nephritis, urinary tract infection, systemic inflammatory response syndrome (SIRS) / sepsis, hepatitis, tuberculosis, CMV infection, MRSA / multidrug-resistant pathogens (multidrug resistance), influenza, enterohemorrhagic Escherichia coli (EHEC), hantavirus.
  • Treatment of other complications: Neurologic complications/uremic neuropathy, osteoporosis, sexual dysfunction, poisoning symptoms, dialysis access complications (steal syndrome, catheter thrombosis).
  • The extrarenal renal syndromes according to Wilhelm Nonnenbruch, i.e. renal insufficiency even without renal disease
  • Kidney worms and other parasites can also damage kidney tissue.
  • Diseases for which extracorporeal therapy procedures may be used: Familial essential hypercholesterolemia, calcium metabolism disorders, hyperviscosity syndrome, multiple myeloma (plasmacytoma), acute myeloblastic leukemia (AML), acute lymphoblastic leukemia (ALL), chronic myeloid leukemia (CML),BCR/ABL positive, B-cell chronic lymphocytic leukemia (CLL), Guillain-Barré syndrome/polyradiculoneuritis, myasthenia gravis, acute liver failure, alcohol toxic liver failure, toxic liver disease with hepatic necrosis, adult respiratory distress syndrome (ARDS), dilated cardiomyopathy, hearing loss, senile macular degeneration, inhibitory haemophilia, rheumatoid arthritis

Renal Replacement Therapies

  • Dialysis: Hemodialysis, Hemofiltration, Hemodiafiltration, Peritoneal Dialysis
  • Kidney transplantation: kidney transplantation follow-up, therapy of functional disorders, failure, rejection of a kidney transplant, evaluation of the recipient as well as in case of living donation of the donor

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