Editing Blood test (section)

===Saliva tests===
In 2008, scientists announced that the more cost effective [[saliva testing]] could eventually replace some blood tests, as saliva contains 20% of the proteins found in blood.<ref>{{Cite journal |display-authors=etal |vauthors=Denny P, Hagen FK, Hardt M |date=May 2008 |title=The proteomes of human parotid and submandibular/sublingual gland salivas collected as the ductal secretions |journal=J. Proteome Res. |volume=7 |issue=5 |pages=1994–2006 |doi=10.1021/pr700764j |pmc=2839126 |pmid=18361515}}</ref> Saliva testing may not be appropriate or available for all markers. For example, lipid levels cannot be measured with saliva testing.