Interferences in an emergency acetaminophen method and its modification.

Area of Science:

• Clinical Chemistry
• Toxicology
• Analytical Chemistry

Background:

• Acetaminophen (paracetamol) overdose is a common medical emergency.
• Accurate and rapid measurement of acetaminophen levels is crucial for guiding treatment.
• Existing methods, like Glynn and Kendall (1975), have known limitations.

Purpose of the Study:

• To present a modified method for emergency acetaminophen estimation.
• To address interference issues in existing methods, particularly from uremic sera.
• To introduce a scanning check for identifying non-specific chromogens.

Main Methods:

• A modified colorimetric assay for acetaminophen estimation.
• Inclusion of a scanning step to detect interfering substances.
• Validation against known interferences like salicylate and endogenous chromogens in uremic samples.

Main Results:

• The modified method accurately estimates acetaminophen levels.
• The scanning check effectively identifies non-specific chromogens that cause falsely high results.
• Interference from uremic sera, previously a problem, is now identifiable and manageable.

Conclusions:

• The modified method offers a more reliable approach for emergency acetaminophen estimation.
• The scanning check improves the specificity and accuracy of the assay.
• This technique is valuable for clinical laboratories managing acetaminophen overdose cases.