Hematuria: Impact of Recent Illness and Testing Options - Urology

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What are the symptoms of occult blood?


I had a health check-up and tested positive for occult blood, but I experienced vomiting and diarrhea two days prior to the test.
The doctor prescribed some medication and administered an anti-nausea injection.
Could this have affected the occult blood results? I did not have any related symptoms during last year's examination.
Should I first improve my hydration and wait a few months before retesting, or should I go for an abdominal X-ray right away? Thank you.

C, 30~39 year old female. Ask Date: 2016/03/30

Dr. Li Xinyi reply Urology


This may affect the symptoms of occult blood; it is recommended to improve hydration first and then undergo testing after one month.

Reply Date: 2016/03/30

More Info


Hematuria, or the presence of blood in urine, can be a concerning symptom that warrants further investigation. In your case, you mentioned that you experienced gastrointestinal symptoms, including vomiting and diarrhea, just two days prior to your health check-up, during which hematuria was detected. It is important to understand how recent illnesses and medications can impact urine test results.

Firstly, acute illnesses, particularly those involving gastrointestinal distress, can lead to dehydration. Dehydration can concentrate urine, which might affect the appearance of urine and potentially lead to false positives in tests for hematuria. Additionally, certain medications, especially those that may irritate the urinary tract or alter kidney function, could also contribute to the presence of blood in the urine. However, the medications you received for nausea and vomiting are less likely to directly cause hematuria.

Given that you did not have any signs of hematuria in previous tests, it is essential to consider this recent illness as a potential factor. However, it is also crucial to rule out other causes of hematuria, which can range from benign conditions, such as urinary tract infections (UTIs) or kidney stones, to more serious issues, including tumors or glomerular diseases.

In terms of next steps, it is advisable to take a cautious approach. Here are some recommendations:
1. Hydration: Improving your hydration status is crucial. Dehydration can lead to concentrated urine, which may exacerbate the appearance of hematuria. Aim to drink plenty of fluids, particularly water, to help flush out your urinary system.

2. Follow-Up Testing: After a period of improved hydration and if your gastrointestinal symptoms have resolved, it would be prudent to repeat the urinalysis. This can help determine if the hematuria persists. If it does, further evaluation will be necessary.

3. Imaging Studies: If hematuria continues after re-testing, your healthcare provider may recommend imaging studies, such as an abdominal ultrasound or CT scan, to assess the kidneys and urinary tract for any abnormalities. An X-ray may not be the most effective initial imaging choice for hematuria, as ultrasound or CT scans provide more detailed information about the urinary system.

4. Consultation with a Specialist: If hematuria persists, consider consulting a urologist. They specialize in urinary tract disorders and can provide a more comprehensive evaluation, including cystoscopy if necessary.

5. Monitoring Symptoms: Pay attention to any additional symptoms, such as pain during urination, changes in urinary frequency, or any other unusual signs. These can provide valuable information for your healthcare provider.

In summary, while your recent illness and medications may have influenced the test results, it is essential to monitor your symptoms and follow up with appropriate testing. Hydration is key, and if hematuria persists, further investigation will be necessary to rule out any underlying conditions. Always consult with your healthcare provider for personalized advice and recommendations based on your specific situation.

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