Figure 1From: The design and evaluation of a shaped filter collection device to sample and store defined volume dried blood spots from finger pricks Shaped filter device for sampling and archiving 20 μl of blood. a, the shaped filter insert laser cut from GB003. b, the insert mounted inside a polyester coated, folded card sleeve. c, diagrammatic instructions for using the device printed on the sleeve. d, the device being filled by placing it against a blood spot until the inverted triangle shape is filled. e unfolded, filled devices left to air dry. f, folded, filled devices ready for storage. g, a single sample removed and cut for DNA extraction.Back to article page