ATLANTA (AP) _ Human blood seeping from the floors of an elderly couple's home has authorities puzzled.

The blood, which was found in the bathroom, kitchen, living room, bedroom and halls of the six-room brick house belonging to William Winston and his wife, Minnie Clyde, was identified as human Wednesday by the State Crime Lab, said police Lt. Horace Walker.

Police spokesman Kevin Forier said investigators could not immediately solve the mystery but that it is unlikely they will go so far as tearing up the floors to find the source of the blood.

Homeowner William Winston undergoes kidney dialysis at a clinic, and may have other medical problems, Forier said. In dialysis, blood is run through a machine to cleanse it as a kidney normally does.

But Winston said: ''I'm not bleeding. My wife's not bleeding. Nobody else was here.''

Forier said police expected to learn the blood type Thursday.

Homicide Detective Steve Cartwright said there is nothing to indicate any wrongdoing at the home, but it was declared a crime scene to keep reporters and curiosity-seekers away.

''It's an extremely strange situation,'' Cartwright said. ''I've been on the force 10 years, and I've never seen anything like this.''

The Winstons, who have been married for 44 years, have lived in the house for 22 years.

''I don't know what the stuff is,'' said Winston, 79. ''My wife is upset because she doesn't know where it's come from. Me, I'm not bothered by it because I'm in bad enough shape as it is.''

Mrs. Winston, 77, said she she discovered the blood shortly before midnight Tuesday after stepping out of the bathtub to find a floor covered with blood.

''I didn't get scared, because I didn't know where it was coming from. It didn't look like blood and it didn't smell like blood,'' Mrs. Winston said.