The fact is that fresher stool samples give you more accurate and sensitive results. (pethealthnetwork.com)
While it is the most sensitive test available, it is also relatively expensive and requires a larger amount of fresh stool to analyze. (texaswestveterinarian.com)
They hope that studying fresh stool samples from the local neonatal unit will help them unlock the mystery of necrotising enterocolitis, a bowel disease that kills up to 5 per cent of premature babies. (newscientist.com)