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Welcome to JA and thanks for your question. I am Dr.Tharun and I will be assisting you with your question today. I would like to have some more information regarding your condition.
Do you take any blood thinners ?
Does the catheter go inside easily ?
Do you have burning while passing urine ?
How is your appetite ?
Are you a diabetic ?Do you have fever?
Any prostate surgeries before ?
Do you ejaculate normally ?
Please let me know
Are you sexually active ?
From the provided information, it doesn't sound like you have an urinary infection. The last portion might be just sedimented urine where debris gravitate. After years of self catheterization , there is bound to be some debri formation as a foreign body is introduced repeatedly. Semen is unlikely when you are sexually inactive. When you are on tamsulosin, you can have retrograde ejaculation - means semen travels back into the bladder and is then expelled with urine. If you are not ejaculating then chances of it being semen is slim.
I would suggest, you can wait and watch than worry about it.
If you have any further queries , please let me know.
Debris are not introduced by you - it is increased cell shedding inside the bladder and possible reaction of the bladder mucosa to the catheter.
Drinking less water in evening and night will result in less bladder filling and less number of times you have to go to the bathroom. Night time drainage of the bladder can be done to prevent frequent visits to toilet.
There are drugs which can completely stop urine production at night , but can have severe salt imbalances especially at your age. Usually prescribed drug is desmopressin nasal spray or lingual tablets.
There is no harm in analyzing the fluid - but it is unlikely to be septic since you don't seem to have any infective features at all.