Pale Stools: Which Blood Tests to Run and Why

Pale stools can be an unexpected and concerning change in your bowel habits. While they might not always indicate a serious problem, pale stools can be a sign of underlying health issues that require attention. This article will discuss the blood tests that can help diagnose the cause of pale stools and explain why these tests are important.

What are pale stools?

Pale stools are bowel movements that appear lighter than usual, often resembling clay or putty in color. This change in color can be due to a lack of bile, which is a digestive fluid produced by the liver and stored in the gallbladder. Bile gives stools their typical brown color, so a reduction in bile can result in paler stools.

Why do pale stools matter?

Pale stools can be an indication of a problem with the liver, gallbladder, or bile ducts. Conditions such as liver disease, gallstones, or bile duct obstructions can interfere with the normal flow of bile, leading to pale stools. Identifying the cause is important because these conditions, if left untreated, can lead to more serious health problems.

Blood tests to consider

Liver Function Tests (LFTs)

Liver function tests are a group of blood tests that measure the levels of enzymes and proteins in the blood. These tests provide information about how well the liver is working. Key markers include:

• Alanine transaminase (ALT) and aspartate transaminase (AST): Elevated levels can indicate liver damage or inflammation.
• Alkaline phosphatase (ALP): High levels may suggest a blockage in the bile ducts.
• Bilirubin: This substance is produced by the liver and gives bile its color. Elevated bilirubin levels can cause jaundice and pale stools.

Complete Blood Count (CBC)

A complete blood count measures different components of the blood, including red and white blood cells and platelets. While not specific to liver or bile duct issues, a CBC can help identify signs of infection or anemia, which may be related to underlying conditions affecting stool color.

Pancreatic Enzyme Tests

Tests for pancreatic enzymes, such as amylase and lipase, can help determine if the pancreas is involved. Pancreatitis, or inflammation of the pancreas, can affect digestion and lead to changes in stool color.

When to see a doctor

If you notice pale stools persisting for several days, or if they are accompanied by other symptoms such as jaundice (yellowing of the skin and eyes), abdominal pain, or unexplained weight loss, it is important to consult a doctor. These symptoms could indicate a more serious underlying condition that requires medical evaluation.

Frequently asked questions

Can pale stools be caused by diet?

Yes, a diet low in fat or high in certain foods may cause temporary changes in stool color. However, persistent pale stools should be evaluated by a healthcare provider.

Are pale stools always a sign of disease?

Not necessarily. While they can be a symptom of a medical condition, occasional pale stools may not be cause for concern. Consistency and accompanying symptoms are key factors.

Can medications cause pale stools?

Yes, some medications can affect bile production or flow, resulting in pale stools. Always discuss medication side effects with your doctor.

Is jaundice always present with pale stools?

Not always. While jaundice often accompanies pale stools when there is a liver or bile duct issue, it is not a definitive symptom for all cases.

How are bile duct obstructions diagnosed?

Bile duct obstructions are typically diagnosed through imaging tests such as ultrasound, CT scans, or MRIs, in addition to blood tests.

Understanding the potential causes and implications of pale stools can guide you in seeking appropriate medical evaluation. Remember, this information is for educational purposes only. Decisions about your health should be made with your healthcare provider.