National Proficiency Testing Scheme for Blood Banking in Thailand-2000.
R. Soisangwan and S. Rojanasuphot
Bureau of Laboratory Quality Standards (BLQS),Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand
The National Proficiency Testing Scheme
in Blood Banking (NPT) has been solely conducted in Thailand since 1986 by BLQS.
The scheme involves proficiency testing for assessment of 627 voluntary Blood bank
laboratories of both government and private hospitals throughout Thailand. The test
items consisting of red blood cell suspensions and sera are sent to participating
laboratories three times a year for testing of ABO blood groups and screening of
unexpected antibodies according to their routine procedures. Test results are
returned to the provider for evaluation by interlaboratory comparisons against
consensus results from reference laboratories. Evaluated scores ranged from 4
(excellent),<4 to 3.5 (very good), < 3.5 to 3.0 (good), < 3.0 to 2.5 (satisfactory) and < 2.5 (poor).
The main objective of the study is
to review the evaluation results from the proficiency testing scheme.
Retrospective results from the year 2000 were analyzed. The overall
results are : 63.8% of the laboratories returned the complete test results.
Among them, 21.5%,58.5%,9%,3% and 8% had excellent, very good, good,
satisfactory and poor performances, respectitively. Poor performance
of the laboratories was mainly due to 1) misinterpretation of the reaction ;
2) inconsistency results between cell grouping and serum grouping reactions
and 3) performing by a non-standard procedure. The quality assessment data are
useful for self-assessment of the laboratories, setting the training course and action plans
for improving quality of the laboratories. NPT is part of the ministry's policy for
health assurance and is mandatory for approval by an external accreditation bodies,
i.e. ISO / IEC 17025 or hospital accreditation.
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