Urine Blood Test Results: Impact of Menstruation

Urinalysis for occult blood?

Hello, I had a health check-up last week, and since the day of the examination was the second day of my menstrual period, I informed the staff about it.
Later, I received the test report indicating a urine occult blood result of 3+.
I would like to know if this could be elevated due to my menstrual period.
Additionally, I usually drink less water.

Sandy, 20~29 year old female. Ask Date: 2024/03/09

Dr. Xu Wencang reply Urology

Follow-up outpatient examination.

Reply Date: 2024/03/09

More Info

When it comes to understanding urine blood test results, particularly in the context of menstruation, it is essential to consider several factors that can influence the results. In your case, you mentioned that you were on your second day of menstruation during the health check, and the report indicated a urine occult blood result of 3+.
Menstruation can indeed affect urine test results, particularly those that assess the presence of blood. During menstruation, it is common for menstrual blood to contaminate urine samples, which can lead to false positives in tests for hematuria (the presence of blood in urine). This is especially relevant if the urine sample is collected during or shortly after menstruation. Therefore, it is possible that the elevated level of occult blood in your urine test could be attributed to menstrual contamination rather than an underlying medical condition.

Additionally, you mentioned that you typically drink less water. Dehydration can concentrate urine, which might also affect the test results. Concentrated urine can sometimes lead to higher readings of certain substances, including blood. It is generally recommended to stay well-hydrated before undergoing urine tests to ensure more accurate results.

Given these considerations, it may be prudent to repeat the urine test after your menstrual period has concluded and after ensuring adequate hydration. This will help provide a clearer picture of your urinary health without the potential interference of menstrual blood.

In summary, menstruation can significantly impact urine test results, particularly in the detection of blood. If you suspect that your test results may have been influenced by your menstrual cycle, it is advisable to consult with your healthcare provider. They may recommend retesting at a more appropriate time to obtain accurate results. Always ensure to communicate any relevant health information, such as your menstrual cycle, to the healthcare professionals conducting the tests, as this can aid in the interpretation of results and subsequent medical decisions.

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