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Section 5 of 6 · Open sections

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Choose follow-up for restricted patterns and urine findings

A narrow beta-gamma band on a specimen submitted as plasma is not ready for monoclonal interpretation. Incomplete clotting leaves fibrinogen that can migrate in the fast-gamma or beta-gamma region. Verify specimen type and repeat on properly clotted serum before treating the finding as a true band.

For a restricted serum pattern that remains after review, serum IFE and sFLC are complementary studies in the suspected monoclonal gammopathy workup. A normal SPEP does not rule out a plasma-cell disorder, so the choice is not to rely on SPEP alone. Local protocol sets reflex triggers and review ownership.

UPEP has a separate concentration question. Total urine protein excretion is expressed as mg/24 h or g/24 h, while a spot concentration depends on urine dilution. A discrete urine beta or gamma band needs urine IFE for confirmation and typing. Choose follow-up from specimen, pattern, and method evidence, then use the local policy card for thresholds.

Illustrative drawing — this picture was drawn rather than captured.

Workflow begins with an unexplained narrow peak or band and reviews specimen and interference. Incomplete clotting can leave fibrinogen in fast-gamma or beta-gamma, hemolysis can form a hemoglobin-haptoglobin complex in alpha-2, and iodinated contrast can create a UV-detected CZE feature near beta. An artifact leads to correction and repeat; no clear artifact leads to IFE and serum free light-chain characterization.
Figure 1Workflow for an unexplained restricted SPEP or UPEP feature, including fibrinogen in fast-gamma or beta-gamma, hemoglobin-haptoglobin in alpha-2, and iodinated-contrast CZE interference near beta.

Ordering exercise

Put the laboratory actions in the preferred sequence when a narrow beta-gamma feature appears on a specimen submitted as plasma.

  1. 1. Perform indicated characterization

    Use IFE and complementary testing according to local protocol if a restricted feature remains.

  2. 2. Repeat electrophoresis

    Determine whether the feature persists on the corrected specimen.

  3. 3. Review specimen type and integrity

    Confirm plasma versus serum and assess hemolysis or interference clues.

  4. 4. Obtain properly clotted serum

    Correct incomplete-clotting fibrinogen that can migrate in the fast-gamma or beta-gamma region before interpreting a band.

Knowledge checks

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Knowledge check 1

Why does a random urine protein concentration not equal total protein excretion?

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Knowledge check 2

A narrow beta-gamma band is present on plasma. What action comes first?

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