Is It Normal For A Woman To Pass Blood Clot In Urine After Stent Placement In LAD Artery?

My wife had a stent placed in her LAD artery.yesterday. Tonight she peed and there was a blood clot in her urine. She is having no problem peeing. And there is no pain. She is worried if this is normal or happens after a cath-lab and stent placement procedure? thank you!