Bone marrow aspirate: a diagnostic tool for primary hyperoxaluria type 1

Area of Science:

• Nephrology
• Metabolic Diseases
• Hematology

Background:

• Primary hyperoxaluria is a rare, autosomal recessive metabolic disorder.
• Calcium oxalate accumulation in the kidneys leads to end-stage renal disease.
• Early diagnosis is crucial to prevent kidney graft loss.

Purpose of the Study:

• To determine the incidence of primary hyperoxaluria in a Tunisian cohort.
• To evaluate the diagnostic utility of bone marrow infiltration by calcium oxalate in uremic stone formers.

Main Methods:

• A 18-year cohort study of stone formers in southern Tunisia.
• Exclusion of secondary hyperoxaluria cases.
• Bone marrow aspirate performed on uremic patients with suspected early hyperoxaluria.
• Calculation of diagnostic accuracy metrics (sensitivity, specificity, PPV, NPV).

Main Results:

• 31 patients (17 male, 14 female) diagnosed with primary hyperoxaluria.
• High mortality rate (70%) among diagnosed patients.
• Bone marrow aspirate in 16 uremic patients: 12 positive, 4 negative.
• Sensitivity: 85%, Specificity: 100%, PPV: 100%, NPV: 50%.

Conclusions:

• Bone marrow examination is a simple and globally applicable method for diagnosing oxalosis.
• This technique facilitates early diagnosis of primary hyperoxaluria.
• Bone marrow analysis aids in managing this severe metabolic kidney disease.