Nephrology

Nephrology is the branch of internal medicine that handles the diagnosis and non-surgical treatment of kidney disease and the long-term follow-up of kidney health. The kidneys do far more than make urine: they filter waste from the blood, balance water and salts, control blood pressure, activate vitamin D for the bones and help make red blood cells. When they are damaged these tasks falter quietly, often without pain, which is why kidney disease is frequently found through a blood or urine test before a patient feels unwell. Nephrologists use this chemistry, together with imaging and sometimes a biopsy, to pinpoint the cause and to slow the loss of function. They work closely with urology when a stone or structural problem needs a procedure, and with the transplant service when kidney function reaches an end stage, but the core of the specialty is the patient steady, long-term medical care that keeps the kidneys working.

The conditions seen in a renal clinic range from sudden to lifelong. Acute kidney injury is a rapid, often reversible loss of function caused by dehydration, infection, medication or another illness. Chronic kidney disease is the gradual decline that may follow diabetes, long-standing high blood pressure or inflammation of the kidney's filters. The glomerular diseases, such as glomerulonephritis and nephrotic syndrome, are immune-driven conditions of those filters that leak protein or blood into the urine. Inherited disease, especially polycystic kidney disease, and diabetic nephropathy are common reasons for long-term follow-up. Nephrology also manages hard-to-control and kidney-related high blood pressure, disturbances of salts and acids in the blood, recurrent urinary infection, and the supportive care and dialysis that people with end-stage kidney disease need, alongside the medical follow-up of kidney transplant before and after surgery.

Most kidney care is medical and aimed at protection rather than cure. For chronic kidney disease the priority is to control blood pressure tightly, treat diabetes and other underlying causes, reduce protein loss in the urine with specific medicines, and adjust diet and fluids, all of which can slow progression and delay or avoid dialysis. Glomerular and immune kidney diseases are treated with anti-inflammatory and immune-modulating therapy guided by the biopsy result. When function falls to an end-stage level, nephrology provides and coordinates dialysis, either haemodialysis through the bloodstream or peritoneal dialysis using the lining of the abdomen, and prepares suitable patients for transplant. Disorders of salt, potassium and acid balance are corrected, and the bone, anaemia and cardiovascular complications of kidney disease are managed in parallel. Throughout, treatment is reviewed regularly so it keeps pace with the changing blood tests.

Diagnosis in nephrology rests on the laboratory, on imaging and, when the cause is unclear, on a tissue sample. Blood tests measure how well the kidneys filter and reveal disturbances of salts, acids and minerals, while urine tests detect protein and blood that signal damage to the filters and quantify how much is being lost. Ultrasound shows the size, shape and structure of the kidneys and screens for blockage, cysts and stones without any radiation, and CT or MRI add detail when needed. When the diagnosis cannot be made from these alone, a kidney biopsy takes a tiny sample under ultrasound guidance and local anaesthesia, which the laboratory examines under the microscope to identify the exact disease and guide treatment. Dialysis technology, both haemodialysis and peritoneal dialysis, supports the body when filtering fails. Together these tools allow kidney disease to be detected early, named precisely and followed objectively over time.

For people who travel, care usually begins with a remote review of recent blood and urine results, blood pressure readings, current medicines and any prior scans, so the right tests can be arranged for arrival. Most of the assessment is outpatient and can be completed over a few days, since blood and urine tests and an ultrasound need no recovery. If a kidney biopsy is needed it is a short procedure under local anaesthesia, followed by a period of bed rest and usually an overnight stay before discharge. People who already receive dialysis can arrange treatment sessions during their visit so that care continues without interruption. Because kidney disease is mostly long-term, a key part of the visit is a clear written plan, with target blood pressure, medicines and monitoring, that a doctor at home can continue. Interpreter and international patient support is widely available to help with appointments, consent and instructions, and remote follow-up keeps the team reachable as results come back.