Posted Date
Effective Date
Test Name
Viscosity
Update Type
Production schedule change
CPT Code
85810
Order Code
VISC
TEST REPORTING CHANGE
Viscosity
Order Code: VISC
Fee Code: 21955 (CPT 85810)
LOINC: 4691-2
Effective March 30, 2026, the Michigan Medicine Laboratories Immunology Laboratory discontinued reporting whole blood viscosity due to the unavailability of required components. Plasma viscosity will continue to be reported. The order code remains the same, however, the LOINC has been updated.