Does diabetic nephropathy require a biopsy?

Written by Zhou Qi

Nephrology

Updated on September 05, 2024

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Whether a patient with diabetic nephropathy needs a biopsy depends on the condition of the patient. Firstly, if the kidney disease is in the early stages and the blood creatinine level has not exceeded 256 micromoles per liter, a kidney biopsy can be considered. Otherwise, if the blood creatinine level exceeds 256 micromoles per liter, a biopsy is no longer meaningful since significant fibrosis and hardening of kidney tissue have already occurred. At this point, if it is unclear whether the proteinuria is caused by diabetes or another disease, a kidney biopsy can be considered to diagnose the cause and extent of glomerular damage, and to provide a basis for treatment.

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Written by Zhou Qi

Nephrology

1min 7sec

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Early symptoms of diabetic nephropathy

Diabetic nephropathy is divided into five stages. In the first and second stages, patients generally do not have significant proteinuria. At this time, the pressure inside the glomeruli increases, and the glomerular filtration rate actually increases, which may result in an increase in kidney size. During this period, patients generally do not have obvious symptoms, and it is difficult to detect without detailed examination. By the third stage, patients develop proteinuria, which increases as the disease progresses, and patients may notice an increase in urine foam. When diabetic nephropathy reaches the stage with proteinuria, a prominent clinical symptom is edema. This edema initially appears in the bilateral facial and lower limb areas. As the disease progresses, some patients may also experience generalized edema, and can develop effusion in the pericardium, thoracic cavity, and abdominal cavity. Symptoms such as chest tightness, shortness of breath, difficulty breathing, pulmonary edema, and heart failure may occur.

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Written by Zhou Qi

Nephrology

55sec

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How to check for diabetic nephropathy?

For the examination of diabetic nephropathy, patients first need to undergo routine urinalysis and check for the urinary albumin excretion rate. Generally speaking, one characteristic of diabetic nephropathy is the presence of urinary protein. A urinary albumin excretion rate between 20 and 200 µg/min is an important basis for diagnosing early diabetic nephropathy. If a patient’s urinary albumin excretion rate consistently exceeds 200 µg/min, significant diabetic nephropathy is often considered. Of course, this is under the assumption that the patient has had diabetes for at least ten years and has diabetic retinopathy. A kidney biopsy is needed for confirmation. Of course, to assess the impact of diabetic nephropathy on kidney function, blood tests for serum creatinine and urea nitrogen are necessary.

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Written by Zhou Qi

Nephrology

55sec

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How many years can a person with diabetic nephropathy live?

Diabetic nephropathy is divided into several stages, from mild to severe. In the early stage, patients only have an increased glomerular filtration rate and the proteinuria is not significant. As the disease progresses, the protein in the urine increases, eventually leading to renal failure and even developing into uremia. The entire process can last many years, with some patients experiencing it for up to ten years. In fact, when diabetic nephropathy progresses to its final stage, uremia, patients still have many treatment options, such as hemodialysis, peritoneal dialysis, or kidney transplantation, and even combined kidney and pancreas transplantation. Therefore, how long a patient can live depends on the patient's age, presence of cardiovascular and cerebrovascular diseases, and the choice of treatment methods, among other factors.

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Written by Zhou Qi

Nephrology

2min 2sec

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Is diabetic nephropathy stage 3 reversible?

Patients with diabetic nephropathy actually have an irreversible condition. If a patient has developed mild to moderate proteinuria and entered stage three, it's generally because of long-term high blood sugar, oxidative stress, and an excess of glycation end products damaging the capillaries of the glomerulus, resulting in increased permeability and the occurrence of proteinuria. The damage that has already occurred cannot be reversed; however, patients still need active treatment to control their blood sugar and blood pressure in order to slow down the progression of diabetic nephropathy as much as possible. Stage three diabetic nephropathy is incurable, but treatment can slow the progression of the kidney disease, preventing the development from microalbuminuria to macroalbuminuria. Stage three refers to the early period of diabetic nephropathy, typically seen in diabetic patients who have had the disease for more than five years. It can feature a continuous increase in urinary albumin excretion rates. High filtration rates and long-term poor metabolic control may be reasons for the persistent microalbuminuria. During this stage, patients may experience a mild increase in blood pressure, and reducing blood pressure can decrease the excretion of microalbumin. During this period, strict control of blood sugar is necessary. Oral hypoglycemic drugs can be used for treatment, and it's crucial to regularly monitor fasting blood glucose, postprandial blood glucose, and glycated hemoglobin. Blood pressure should also be actively controlled, generally targeting a value of 130/80mmHg. Angiotensin-converting enzyme inhibitors and angiotensin II receptor antagonists are preferred as they can lower blood pressure, reduce proteinuria, and have a protective effect on the kidneys, thus delaying the progression of kidney disease.

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Written by Zhou Qi

Nephrology

42sec

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Early signs of diabetic nephropathy

Diabetic nephropathy is caused by long-term diabetes leading to damage in the small blood vessels. Generally, patients have a history of diabetes for over ten years. Diabetic nephropathy progresses through several stages. In the early stages, patients primarily exhibit microalbuminuria. Due to the presence of protein in the urine, patients may experience increased urine foam, especially noticeable with morning urination. Some patients may develop swelling in the lower limbs and around the eyelids. As the condition progresses, the amount of urine protein increases and the swelling becomes more pronounced, potentially reaching the level of nephrotic syndrome.