Population
Laboratories in Ontario, Canada participating in the Quality Management Program - Laboratory Services…
Design
Cross-sectional
Authors
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Marked interlaboratory variability persists in UFH monitoring by both APTT and anti-Xa; supports standardization efforts but leaves optimal assay choice open.
Substantial interlaboratory variation exists in unfractionated heparin monitoring using APTT, which is not reduced by the use of anti-Xa assays.
Raby et al. (2010) studied this question.
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