A Blood Specimen Is Collected in a Heparin-Containing Tube for Calcium

question 12

Multiple Choice

A blood specimen is collected in a heparin-containing tube for calcium and magnesium determination.Upon centrifugation,the plasma appeared hemolyzed.How would this affect the magnesium value?

• A) There would be no effect on the magnesium value.
• B) The magnesium would form complexes with the hemoglobin and the results would indicate a false negative value.
• C) The magnesium would be incorporated into the bilirubin molecule,leading to a false negative value.
• D) Because erythrocytes contain magnesium,hemolysis would increase its apparent value.

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