Rapid amylase and lipase determinations by nephelometry

Area of Science:

• Clinical Chemistry
• Biochemical Assays

Background:

• Emergency laboratory testing requires rapid and reliable diagnostic tools.
• Amylase and lipase assays are crucial for diagnosing pancreatic conditions.

Purpose of the Study:

• To evaluate the performance of the Coleman 91 nephelometer for amylase and lipase assays.
• To assess its suitability for emergency diagnostic requests.

Main Methods:

• The Coleman 91 nephelometer was used for amylase and lipase assays.
• Assay linearity, precision, and normal ranges were compared to established methods (Phadebas, amyloclastic, titrimetric).
• The impact of lipemic sera on assay results was investigated.

Main Results:

• Amylase assay showed favorable linearity and precision comparable to Phadebas assay in serum and urine.
• Serum amylase normal ranges were slightly higher than amyloclastic methods.
• Lipase assay demonstrated improved linearity over titrimetric methods but variable kinetics.
• Lipase assay precision was lower than amylase, with higher normal ranges than titrimetric methods.
• Falsely low amylase and lipase results were observed in highly lipemic sera, necessitating dilution.

Conclusions:

• The Coleman 91 nephelometer is a viable option for rapid amylase and lipase testing, especially in emergency settings.
• Careful interpretation is needed for lipemic samples, requiring serial dilution for accurate quantification.