Normal Stool Color with Dark Water: What You Need to Know

The stool color is normal, but the water is very dark?

Is it normal for the stool color to be normal but the water to be very dark? Additionally, should I stop taking probiotics before undergoing a fecal occult blood test to avoid affecting the results?

B, 30~39 year old female. Ask Date: 2019/08/25

Dr. Chen Shidian reply Gastroenterology and Hepatology

There is no need to discontinue use, but food factors (such as dragon fruit) should be excluded.
First, take a photo with your mobile phone for reference, and then collect a stool sample for testing.

Reply Date: 2019/08/25

More Info

When it comes to stool color and consistency, it is essential to understand that variations can occur due to a variety of factors, including diet, hydration levels, and overall health. In your case, you mentioned that the stool color appears normal, but the water in the toilet bowl is very dark. This situation can be concerning, but it is important to clarify a few points.

Firstly, the color of the stool itself is typically influenced by what you eat. Foods high in iron, such as red meat, dark leafy greens, and certain supplements, can lead to darker stools. Additionally, the presence of bile, which is produced by the liver and stored in the gallbladder, can also affect stool color. If the stool is brown, it usually indicates a healthy balance of bile and digestive processes. However, if the stool appears black or tarry, it may indicate the presence of digested blood, which could be a sign of gastrointestinal bleeding and should be evaluated by a healthcare professional.

Regarding the dark water in the toilet bowl, it is important to note that this can sometimes be an optical illusion caused by the color of the stool itself. If the stool is dark brown, it may create the appearance of dark water. However, if you notice that the water is consistently dark and the stool is not, it could be worth investigating further. Factors such as the toilet bowl's cleanliness, the type of toilet, and even the lighting in the bathroom can affect how the water appears.

As for your question about whether to stop taking probiotics before a fecal occult blood test, it is generally advisable to inform your healthcare provider about any supplements or medications you are taking prior to the test. Probiotics are not typically known to interfere with the results of a fecal occult blood test, but they can alter the gut flora and potentially affect the consistency of the stool. Therefore, it may be prudent to stop taking probiotics for a few days before the test to ensure accurate results, but this should be confirmed with your healthcare provider.

In summary, while the appearance of dark water in the toilet bowl can be concerning, it is essential to consider the context of your overall health, diet, and any accompanying symptoms. If you have any doubts or if the situation persists, it is best to consult with a healthcare professional for a thorough evaluation. They may recommend a fecal occult blood test or other diagnostic procedures to rule out any underlying issues. Remember, maintaining open communication with your healthcare provider about your symptoms and any supplements you are taking is crucial for accurate diagnosis and treatment.

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