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Pseudohyperphosphataemia in multiple myeloma.

R C Hawkins1

  • 1Department of Clinical Chemistry, Auckland Hospital, New Zealand.

Annals of Clinical Biochemistry
|May 1, 1991
PubMed
Summary

Spurious hyperphosphataemia can occur in multiple myeloma patients due to a specific lab method. This falsely elevated phosphate level results from a protein suspension interfering with the phosphomolybdate assay.

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Area of Science:

  • Clinical Chemistry
  • Hematology
  • Oncology

Background:

  • Hyperphosphataemia is a common clinical finding.
  • Multiple myeloma is a hematologic malignancy characterized by abnormal plasma cells.
  • Accurate biochemical measurements are crucial for patient management.

Purpose of the Study:

  • To report two cases of spurious hyperphosphataemia in multiple myeloma patients.
  • To identify the cause of falsely elevated phosphate levels.
  • To raise awareness of potential laboratory interference in myeloma.

Main Methods:

  • Analysis of serum phosphate levels using an unreduced phosphomolybdate method.
  • Investigation of the reaction mixture for interfering substances.
  • Clinical correlation with patient diagnosis of multiple myeloma.

Main Results:

  • Falsely elevated serum phosphate levels were observed in two multiple myeloma patients.
  • The elevated values were attributed to the formation of a proteinaceous suspension in the reaction mixture.
  • The interference was specific to the unreduced phosphomolybdate method without dialysis.

Conclusions:

  • The unreduced phosphomolybdate method can lead to spurious hyperphosphataemia in multiple myeloma.
  • Protein interference in laboratory assays may be underestimated.
  • Clinicians should consider potential assay interference when interpreting phosphate levels in myeloma patients.

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