This is Dr. David
blood in the stools can often be from hemorrhoid bleeding if he has constipation and large hard stools.
bloody nose can be from dry nose or allergies or dry nasal mucosa.
eating more fruits and vegetables and drinking more water can help soften his stools and help prevent constipation
if he drinks more water, his creatinine levels will come down.
normal 5 year old boy creatinine levels are 34-72 umol/L
so that 46 creatinine is normal.
if he was bleeding, what is most important is his platelets and liver enzymes as these control normal clotting function.
if these are normal, that is most important.
let me know if you have questions.