I watched CSI last night,was wondering how long does blood stay in a body when you die?

Answer 1

After some time the blood settles in your legs as there is no heart beat to pump it. So don't believe all that blood splattering out when a body is dug up. It's called post mortem lividity.
They determine the time of death by the amount of blood in the legs.
Read Perry Mason books.

Answer 2

This is yet another case of Hollywood drama. Since I used to embalm bodies, I think I know a thing or two about blood in them! :-)
Blood, like anything else in a body, isn't going anywhere until it is forcibly removed through either an opening like an accidental cut or mutilation, an intentional incision, or the embalming process itself.
If it remains in the body for a while, it will, like any other liquid affected by gravity, seek the lowest point it can go. Therefore, if that lowest location is the head and shoulders, then that part of the body is going to become bluish black with deoxygenated blood. If it's the legs, there are some bluish-black legs on the corpse. Most of the time, however, a person is in a hospital bed, bed at home, or similar location of death and are lying on their back, so the lower half of their body (the backside, back, hands if they are at a downward angle, etc) is where the blood is until it is removed.
And it decomposes right along with the other parts of the body if left untreated. Like an old commercial said that many of you younger people may never have seen, "Parts is parts!" :-)

Answer 3

I believe that the blood decays with the body, but I also think that blood pools to the side that the body is lying upon. It would begin pooling right after circulation stops.

Answer 4

It gets absorbed into the organs. I guess it stays there until it dries up. I've seen dead mans blood. Ick, this one was green.

Answer 5

I'm not sure but I know it clots fairly soon as it is not moving