What Is Normal Size Of Kidney?

Charlotte Miller

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Are you curious to know what is normal size of kidney? You have come to the right place as I am going to tell you everything about normal size of kidney in a very simple explanation. Without further discussion let’s begin to know what is normal size of kidney?

What Is Normal Size Of Kidney?

The kidneys are vital organs that play a crucial role in maintaining the body’s internal balance and filtering waste products from the blood. Understanding the normal size of the kidneys is essential for assessing their health and function. In this blog post, we will explore what constitutes a normal kidney size, factors that influence kidney size, and the significance of monitoring kidney health.

The Anatomy Of Kidneys

Before delving into kidney size, it’s important to understand the basic anatomy of these bean-shaped organs. The kidneys are located in the abdominal cavity, with one kidney on each side of the spine. They are situated just below the ribcage, near the middle of the back. The kidneys receive blood from the renal arteries, filter it to remove waste and excess fluids, and then return the cleaned blood to circulation through the renal veins.

Normal Size Of Kidneys

The size of the kidneys can vary among individuals and may be influenced by factors such as age, sex, body size, and underlying medical conditions. However, a general guideline for the normal size of adult kidneys is as follows:

  • Length: Approximately 10-12 centimeters (about 4-4.7 inches)
  • Width: Approximately 5-7 centimeters (about 2-2.8 inches)
  • Thickness: Approximately 2-3 centimeters (about 0.8-1.2 inches)

It’s important to note that kidney size tends to decrease slightly with age, particularly after the age of 40. Additionally, there may be slight variations in size between the left and right kidneys.

Factors Affecting Kidney Size

Several factors can influence the size of an individual’s kidneys:

  1. Age: As mentioned, kidney size tends to decrease slightly with age due to changes in tissue density and blood flow.
  2. Body Size: Larger individuals may have slightly larger kidneys, but this relationship is not always proportional.
  3. Medical Conditions: Certain medical conditions, such as kidney disease, kidney cysts, and tumors, can lead to changes in kidney size.
  4. Dehydration: Temporary changes in kidney size can occur due to dehydration or inadequate fluid intake.

Significance Of Monitoring Kidney Size

Monitoring kidney size can be a valuable aspect of assessing kidney health. Abnormalities in kidney size can be indicative of underlying medical issues, including:

  1. Kidney Disease: Enlarged or shrunken kidneys can be a sign of chronic kidney disease or other renal disorders.
  2. Polycystic Kidney Disease (PKD): This genetic condition causes the growth of multiple cysts within the kidneys, leading to an increase in kidney size.
  3. Tumors: Kidney tumors, both benign and malignant, can affect kidney size and function.
  4. Hydronephrosis: Blockage or obstruction in the urinary tract can result in swelling and enlargement of the affected kidney.


Understanding the normal size of kidneys is a valuable part of kidney health assessment. While there is some natural variation in kidney size among individuals, significant deviations from the normal range can be indicative of underlying health issues. Regular medical check-ups, including imaging studies, can help monitor kidney size and identify potential problems early, allowing for timely intervention and treatment to preserve kidney function and overall well-being.


What Is The Normal Size Of Right And Left Kidney?

Results: Median renal lengths were 11.2 cm on the left side and 10.9 cm on the right side. Median renal volumes were 146 cm3 in the left kidney and 134 cm3 in the right kidney. Renal size decreased with age, almost entirely because of parenchymal reduction. Renal volume correlated best with total body area.

What Size Is A Healthy Kidney?

Normally, kidneys are about the size of a fist or 10 to 12 cm (about 5 inches). Kidney atrophy means that the kidney is smaller than normal. This can happen for two basic reasons. The first is that part of the kidney does not develop from birth (called a congenital problem) making a small kidney.

Is 9.5 Cm Kidney Size Normal?

The mean average pole-to-pole length of an adult human kidney is 10-13 cm. In general, the left kidney is slightly longer than the right.

What Size Is Considered Enlarged Kidney?

From his figures we may conclude that a kidney measuring longer than 14 em on a supine abdominal film is a large kidney and should be regarded with some suspicion.

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