Direct answer: To remove blood from carpet, act quickly and use cool water, blotting rather than rubbing, then apply a gentle cleaning solution and blot again. For stubborn or dried stains, peroxide, vinegar, or starch-based pastes can help, but test any chemical on a hidden area first to avoid bleaching or damage. Rinse and dry thoroughly. Steps you can follow

• Fresh blood
  • Blot with a white cloth to lift as much as possible; avoid rubbing.
  • Spray or dab cold water onto the stain and continue blotting until no more color lifts.
  • If needed, use a mild dish soap solution (a few drops of detergent in a cup of cool water); blot, then rinse with clean water and blot dry.
  • Allow the area to air dry or lightly vacuum when dry to restore the pile.
• Dried blood
  • Gently exfoliate the surface with a dull tool or cloth to loosen fibers around the stain without spreading.
  • Apply a cold-water rinse to moisten, then blot to lift as much as possible.
  • If the stain persists, apply a small amount of hydrogen peroxide (3%); let fizz briefly, then blot and rinse. (Test first on a hidden spot to confirm no color change.)
  • Alternatively, a vinegar solution (1 cup vinegar to 2 cups water) can help dissolve the stain; blot and then rinse.
• Deep set or stubborn stains
  • Consider a paste made from cold water and cornstarch or salt; apply to the stain, let dry, then vacuum away the residue.
  • If you have access to a carpet cleaner with an enzymatic or oxygen-based stain remover, follow the product’s instructions after testing on a hidden area.

Tips and cautions

• Always use cold or cool water; hot water can set protein-based stains like blood.
• Work from the outside of the stain inward to confine the area.
• If the carpet is delicate or the stain is large, professional cleaning may be the safest option.

If you share details about your carpet type (synthetic vs. natural fiber) and the stain’s age, can tailor the approach to minimize risk of damage.