Liver span

Liver Span

Diagram of the human liver

The liver span is a clinical measurement used to assess the size of the liver in the human body. It is an important parameter in the physical examination of the abdomen, particularly in the context of diagnosing liver diseases such as hepatomegaly or cirrhosis. The liver span is typically measured in the midclavicular line (MCL) on the right side of the body.

Measurement Techniques

The liver span is usually measured by percussion and palpation.

Percussion

Percussion involves tapping on the surface of the abdomen to detect the borders of the liver. The examiner starts percussing in the right midclavicular line from the area of lung resonance down to the area of dullness, which indicates the upper border of the liver. The lower border is determined by percussing upwards from the area of abdominal tympany. The distance between these two points is the liver span.

Palpation

Palpation is used to feel the lower edge of the liver. The examiner places their hand on the right lower quadrant of the abdomen and asks the patient to take a deep breath. As the diaphragm pushes the liver down, the examiner can feel the liver edge. This method is often used in conjunction with percussion to confirm the liver span.

Normal Liver Span

The normal liver span varies with age, sex, and body size. In adults, the average liver span is approximately 6 to 12 centimeters in the midclavicular line. In children, the liver span is smaller and increases with age.

Clinical Significance

An increased liver span may indicate conditions such as hepatomegaly, which can be caused by congestive heart failure, hepatitis, or fatty liver disease. A decreased liver span may be seen in conditions such as cirrhosis, where the liver becomes shrunken and fibrotic.

Related Pages

• Liver
• Hepatomegaly
• Cirrhosis
• Percussion (medicine)
• Palpation