Results are reported as a relative viscosity to water, where normal serum and plasma have a relative viscosity of up to 1.6. Serum, plasma or whole blood viscosity measurements can be useful in patients with hyperviscosity syndromes due to multiple myeloma or Waldenstrom's macroglobulinemia. Viscosity is the property of fluids to resist flow. Lab Name Viscosity, Serum Lab Code SRVISG Epic Ordering
