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Hello from JustAnswer.
It will help if you could provide some further information.
Do you have the complete results of the urinalysis?
Were blood tests done? If so, what blood tests were done?
I had asked for some further information and have not heard back.
There are several possibilities to consider in this situation.
The most common problem that causes blood in the urine would be an infection. If you have the complete report of the urinalysis, that would usually have other findings beyond the blood to suggest whether an infection is present.
It is also common for blood in the urine to be due to kidney stones. There also can be a variety of less common causes, such as inflammation of the kidneys or urinary system or growths within the urinary system.
If the ultrasound did not identify any abnormalities, the most common cause of the enlargement of the stomach that you have noticed would be from gas accumulation, but this can be a non-specific response to a variety of conditions, so does not differentiate from the various possibilities noted above.
If I can provide any further information, please let me know.