Correlation between red cell pyruvate kinase activity and haematological parameters

Area of Science:

• Hematology
• Clinical Biochemistry
• Enzyme Assays

Background:

• Red cell pyruvate kinase (PK) is a critical enzyme in glycolysis.
• PK deficiency leads to hemolytic anemia.
• Hematological parameters can influence PK activity measurements.

Purpose of the Study:

• To investigate the correlation between red cell pyruvate kinase activity and various hematological parameters.
• To identify potential confounding factors in PK activity assays, particularly in anemic patients.
• To provide recommendations for accurate PK deficiency diagnosis.

Main Methods:

• Correlation analysis between red cell PK activity and hematological parameters (hemoglobin, red blood cell count, packed cell volume, white blood cell count, reticulocyte count, red cell indices).
• Analysis was performed separately for anemic and non-anemic patient groups.
• Statistical significance was assessed for observed correlations.

Main Results:

• In anemic patients, PK activity showed significant negative correlations with hemoglobin, RBC count, and PCV.
• A positive correlation was observed between PK activity and WBC count, reticulocyte count, and red cell indices in anemic patients.
• Non-anemic patients showed similar correlations, except for a non-significant negative correlation with reticulocytes.

Conclusions:

• Elevated white blood cell counts in patients with anemia, infections, and leukocytosis can mask PK deficiency.
• Reticulocyte counts also influence PK activity measurements.
• Pre-assay elimination of white blood cells and correction for reticulocytes are essential for accurate PK deficiency diagnosis.