Guaiac test for occult faecal blood
Technician tests a card from a bowel cancer sceening kit. Hydrogen peroxide is being applied to faecal stains, and any transient blue colour will indicate the prescence of occult (hidden) blood, suggesting a further investigations for bowel cancer or polyps.
©James King-Holmes 2011 ©James King-Holmes |PLUS|01-AA-662| 2011
Photo size: 17.6 Mpixels (50.3 MB uncompressed) - 5140x3420 pixels (17.1x11.4 in / 43.5x29.0 cm at 300 ppi)