Hyperviscosity Syndrome Workup
- Author: Thomas J Hemingway, MD; Chief Editor: Barry E Brenner, MD, PhD, FACEP more...
Laboratory Studies
- Determine serum viscosity.
- Serum viscosity is diagnostic in evaluating hyperviscosity syndrome when the elevated viscosity is concomitant with characteristic symptoms. No exact diagnostic cut-off exists for viscosity as different patients will have symptoms at different values of viscosity.
- A clue may be that the laboratory may be having difficulty performing chemical tests on the blood due to the serum stasis and increased viscosity, which may clog analyzers.
- The normal reference range is 1.4-1.8 Centipoises (1.0 being the viscosity of water).
- Symptoms usually are not seen before the viscosity reaches 4 Centipoises, and hyperviscosity syndrome usually presents with a serum viscosity greater than 5 Centipoises. Typically, the higher the viscosity, the worse are the symptoms.
- Obtain a peripheral blood smear with the CBC. Rouleaux formation is often present with increased serum viscosity.
- WBC count is typically 100,000 or greater in leukostasis causing HVS, but it may be lower in the blast crises of the leukemias.
- Consider adding total protein (TP) and albumin as in the paraproteinemias; a globulin gap (TP – albumin = 4 or greater) may exist.
- Consider adding a metabolic panel and electrolytes as derangements such as hypercalcemia, hyperphosphatemia, and hyperkalemia are common and may require specific treatment. (Be sure not to contribute to pseudohyperkalemia secondary to the increased cellular lysis from poor venipuncture technique; use a larger needle, withdraw slowly and, if in doubt, send for a plasma rather than serum potassium level, which will be more reliable).
- Consider adding serum and urine electrophoresis in new cases without preceding diagnosis for diagnostic purposes.
- Consider coagulopathy workup (eg, blood count, type and screen, prothrombin time, activated partial thromboplastin time, platelet count) if the patient presents with hemorrhage.
- Tailor additional workup (eg, chest radiography, brain CT or MRI) to the patient's presentation.
- Consider panculture and urinalysis.
- Multiple myeloma is complicated frequently by infections.
- In nonneutropenic patients, infections are usually secondary to Streptococcus pneumoniae or Haemophilus influenzae.
- Search for other disorders. Hyperviscosity syndrome is the result of another pathologic process (eg, multiple myeloma, Waldenström macroglobulinemia, hyperproliferative blood cell dysplasias).
Imaging Studies
- Head CT scan is indicated if the patient presents with altered level of consciousness, seizures, or focal neurologic deficits.
- Contrast dye is contraindicated in multiple myeloma because of the increased risk of renal failure.
- Chest radiograph may be indicated to rule out infection. It also may reveal congestive heart failure (CHF). High output failure can be caused by hyperviscosity or anemia.
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