Ready-to-use, liquid stable clinical reference materials for microprotein testing are now available from Verichem Laboratories. Intended for the calibration and verification of clinical systems testing for total protein and albumin in both urine and cerebral spinal fluid (CFS), the five-level set of materials provides ten individual certified concentrations, in a liquid stable, azide-free format, where all concentrations are assigned by definitive procedures using human protein components of known purity. Accurate measurement of microprotein and microalbumin levels aids in the early detection of kidney damage, while testing CSF can help detect central nervous system disorders such as multiple sclerosis or meningitis. The materials are filled in translucent polyethylene dropper vials and offer a shelf-life stability claim of 24 months from date of manufacture when stored refrigerated at temperatures of 2° to 8°C.