Appearance	Clear to straw colored
Protein	<2.5 g/dL (also cited 1.5-3.0 g/dL)
pH	7.0-7.8
Viscosity	2 cm in string test
Mucin clot	Good (tight dot formation)
Cell count (/μL)	<3000 (dogs); <1000 (cats)
Neutrophils	<5%
Mononuclear cells	>95% (small: lymphocytes; large: macrophages and synoviocytes)
Quantity	Only a small amount should be present (<0.5 mL in most joints)