Editing Synovial fluid (section)

=== Chemistry ===
The mucin clot test is a very old approach to determining if an inflammatory infiltrate is present.  In this test, acetic acid is added to the synovial fluid specimen.  In a normal specimen, this should lead to a congealing of the hyaluronic acid, forming a 'mucin clot.'  If inflammation is present, a mucin clot is not formed (the hyaluronic acid is degraded).<ref name=demais2009>{{Citation |last=De Mais |first=Daniel |year=2009 |title=Quick Compendium of Clinical Pathology |edition=2nd |publisher=[[ASCP Press]] |location=Chicago |isbn=9780891895671 |oclc=692198047 |url-access=registration |url=https://archive.org/details/quickcompendiumo0000mais }}{{pages needed|date=April 2013}}</ref>

Lactate is elevated in septic arthritis, usually above 250&nbsp;mg/dL.

Complement factors are decreased in rheumatoid arthritis and lupus arthritis.