Concentration Methods

• What is the primary purpose of concentration methods in an O&P examination?

  = What is the primary purpose of concentration methods in an O&P examination?
• Which technique involves parasites settling in the sediment at the bottom of the tube during centrifugation?

  = Sedimentation
• Which of the following is typically not viable after the concentration procedure?

  = Trophozoites
• Which concentration technique involves parasites floating to the surface during centrifugation?

  =  Flotation
• Which concentration technique utilizes formalin and ethyl acetate?

  = Sedimentation
• What is the purpose of adding ethyl acetate in the formalin-ethyl acetate sedimentation procedure?

  = To remove fecal debris
• What should be examined from the sediment in the formalin-ethyl acetate sedimentation procedure?

  = Wet preparations with iodine
• Which concentration technique utilizes zinc sulfate solution?

  = Flotation
• What is the advantage of the zinc sulfate flotation technique?

  =  Removal of fecal debris for cleaner preparations
• What is recommended to examine for both sediment and surface film in the zinc sulfate flotation technique?

  =  Saline and iodine wet preparations