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Interlaboratory comparison of blood lead determinations
American Industrial Hygiene Association Journal
|March 1, 1979
Summary
An interlaboratory study assessed blood lead measurement accuracy. While laboratory agreement improved over two years, blood remains a challenging matrix for precise lead determination.
Area of Science:
- Clinical Chemistry
- Environmental Health
- Toxicology
Background:
- Accurate blood lead level (BLL) measurement is crucial for monitoring lead exposure.
- Proficiency testing programs are essential for ensuring laboratory quality and comparability.
- Occupational lead exposure necessitates reliable analytical methods for public health surveillance.
Purpose of the Study:
- To evaluate the performance of laboratories in determining blood lead concentrations.
- To assess interlaboratory agreement and identify trends in analytical accuracy over time.
- To highlight challenges in measuring lead in biological matrices like blood.
Main Methods:
- An interlaboratory proficiency study was conducted.
- Samples were prepared from blood of individuals with occupational lead exposure.
- Laboratory performance was tracked over a two-year period.
Main Results:
- Overall agreement among participating laboratories showed some improvement.
- Blood was confirmed as a difficult matrix for accurate lead concentration measurement.
- Individual laboratory performance varied, necessitating ongoing quality assessment.
Conclusions:
- Proficiency testing has led to modest improvements in blood lead determination.
- Continued efforts are needed to enhance the accuracy and reliability of lead measurements in blood.
- Standardization of methods and rigorous quality control are vital for occupational health monitoring.
