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Endotoxin Activity Assay for the Detection of Whole Blood Endotoxemia in Critically Ill Patients
Published on: June 24, 2019
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Endotoxin detection in end-stage kidney disease
Jonathan Wong1, Hassan Jeraj2, Enric Vilar1
1Department of Renal Medicine, Lister Hospital, Hertfordshire, UK Department of Postgraduate Medicine, University of Hertfordshire, Hertfordshire, UK.
Journal of Clinical Pathology
|November 8, 2014
Summary
The kinetic Limulus amoebocyte lysate (LAL) assay accurately detects endotoxin in end-stage kidney disease (ESKD) patients. Tween 80 improves endotoxin recovery in ESKD plasma, enhancing assay reliability.
Area of Science:
- Biochemistry
- Clinical Chemistry
- Nephrology
Background:
- Endotoxin detection assays lack validation for end-stage kidney disease (ESKD).
- Accurate endotoxin measurement is crucial for managing patients with ESKD.
Purpose of the Study:
- To evaluate the accuracy and precision of the kinetic turbidimetric Limulus amoebocyte lysate (LAL) assay for endotoxin detection in ESKD patient plasma.
- To optimize endotoxin recovery from plasma using Tween 80.
Main Methods:
- Plasma samples from ESKD patients and healthy subjects were spiked with known endotoxin concentrations.
- Spike recovery was measured repeatedly to assess assay accuracy and precision.
- Endotoxin recovery was compared using Tween 80 and water as diluents.
Main Results:
- Mean endotoxin spike recovery was high in both ESKD (111.6%) and healthy (125.2%) subjects, with no significant difference.
- The LAL assay demonstrated good precision, with lower variability at higher endotoxin concentrations.
- Using Tween 80 as a diluent significantly improved endotoxin recovery in ESKD plasma (100.1% vs 70.4%, p<0.001).
Conclusions:
- The kinetic turbidimetric LAL assay is validated for detecting blood endotoxin in ESKD patients.
- Assay accuracy and precision may be reduced at low endotoxin levels (≤0.05 EU/mL).
- Tween 80 is an effective diluent for optimizing endotoxin recovery in ESKD plasma.
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