There was a faint ring of blood around the stained area, but I treated that with a bit more of the Carbona blood stain remover, and then threw the mattress pad into the washer and when I took it out the stain was completely gone. Not a trace left that I could see.
However, I've had several additional occasions since then when I've used Carbona blood stain remover on my blood stained clothes and each time I have gotten excellent results, similar to the first time.
This blood stain remover is only designed to work on clothing, such as either washable or dry clean only fabrics, but not on leather, suede, silk, acetate, carpet or .
Hint: If the spot has dried onto the upholstery, brush off as much of the dried blood as possible before you begin using the blood stain removal solution.