Effectiveness evaluation of practice of quality control for occupational health testing

Objective To assess the effectiveness of practice of quality control for occupational health testing.

Methods The instrumental comparison, personal comparison, sample re-examination, measurement auditing and inter-laboratory comparison were done and the data were analyzed, according to both the guidance on statistic treatment of proficiency testing results and performance evaluation and the guidance for measurement uncertainty evaluation based on quality control data in environmental testing.

Results The heat radiation intensity was (0.241 ±0.005) kw/m² measured with MR-3A and (0.246 ±0.004)kw/m² measured with SFR-Ⅲ heat radiation meters (P>0.05), respectively. The benzene concentration was (589.4 ±3.0) and (588.2 ±1.6) mg/m³ (P>0.05), respectively, in the two activated carbon tubes used by two professionals. The cadmium concentration was (0.312 ±0.007) and (0.323 ±0.009)μg/mL (P>0.05), respectively, reported by sample re-examination. The measurement audit showed that content of a certified reference material was (0.247 ±0.009)μmol/L and there was no difference with the certificated parameter of (0.255 ±0.008)μmol/L (P>0.05). The measurement of urinary lead in two laboratories showed that the result was (40.81 ±2.43)μg/L and (43.10 ±1.68)μg/L (P>0.05), respectively.

Conclusion Implementation of quality control for occupational health testing is effective and it is the objective evidence to preserve the laboratory with good reliability and applicability.