Hi Dr. Binod,
Welcome to HCM.
If the blood does not get sufficient time to remain in the bladder i.e it is passed out with urine before clotting, then naturally you cannot expect clots in the bladder.
In most of the cases of haematuria we never come across clots in the bladder. Only in case of massive bleeding, clots are seen in the bladder and in such case the clots themselves are responsible for urinary bladder outlet obstruction
and if indwelling catheter is in-situ, even the catheter gets blocked.