Viscosity, Serum

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General Information

Lab Name
Viscosity, Serum
Lab Code
SRVISG
Epic Ordering
Viscosity, Serum
Description

Viscosity is the property of fluids to resist flow. Serum, plasma or whole blood viscosity measurements can be useful in patients with hyperviscosity syndromes due to multiple myeloma or Waldenstrom's macroglobulinemia. Results are reported as a relative viscosity to water, where normal serum and plasma have a relative viscosity of up to 1.6. Although viscosities >1.6 are abnormal, hyperviscosity syndromes are rarely present unless the relative viscosity is >4.0 (approximately). The most common cause of serum hyperviscosity is the presence of large concentrations of IgM monoclonal proteins, and Waldenstrom's macroglobulinemia accounts for 80% to 90% of symptomatic hyperviscosity cases. Hyperviscosity syndrome can also occur in multiple myeloma patients, and, rarely, in patients with rheumatoid factors and other aggregating proteins.

References

Chandler WL and Schmer G, Evaluation of a new dynamic viscometer for measuring the viscosity of whole blood and plasma, Clin Chem (1986) 32:505.

Synonyms
Components

Interpretation

Method

Laboratory developed method to measure the viscosity of serum, plasma, fluid or whole blood samples using a dynamic viscometer (Sonoclot II Surgical Analyzer).

Reference Range
See individual components
Interferences and Limitations

Samples with cryoglobulins may have a falsely depressed result if the sample has not been processed as a cryoglobulin.

Guidelines

Ordering & Collection

Specimen Type
Serum
Collection

3mL blood in RED TOP tube.

If Clinician suspects patient has a cryoglobulin, contact Immunology Lab 206 598-6149 for special handling instruction.

Handling Instructions
Quantity
requested: 1.5 mL serum
minimum: 0.9 mL serum

Processing

Processing

Refrigerate serum

Outside Laboratory: Centrifuge, remove serum, Aliquot 1.5 mL, (minimum 0.9 mL). Refrigerate serum. Do not Freeze.

Performance

LIS Dept Code
Immunology (IMM)
Performing Location(s)
UW-MT Immunology
206-520-4600

Clinical Lab, Room NW220,
University of Washington Medical Center,
1959 NE Pacific street, Seattle, WA 98195

Frequency
Monday-Friday
Available STAT?
No

Billing & Coding

CPT codes
85810
LOINC
3128-6
Interfaced Order Code
UOW3634