surely a solution is something that has been absorbed but the liquid and suspension is when there are bits floating in it?

when i had my kidney problems the doc basicly said that it's filtered stuff from your blood, but what happenes is that it's like water thats been filtered through mointains and stuff, it carries micro bits of materials in it which is why you have stalagtites and stalagmites form where the water drips and it's also why you get kidney stones (from when the bladder is full and cannot take anymore and so the kineys back up with urine and the sediments start to congregate inside)

so, from all that, it's pretty clear that on a microscopic level it would be categorised as suspension, although for the most part, and to the human eye, it would be regarded as a solution