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Here also, I think it is better to do PTT rather than APTT. Also, authors are talking about prolongation of APTT, and argues that it is better. In fact, what I believe is that, a material should not cause much of any change in the property. Also, this test detects deficiency or abnormality of clotting factors. Only if this happens, it gives a prolonged time, which is not actually the case. Actually, if you check the normal range, you would better understand this. Here, the PLA samples actually caused some activation and thereby decreased the APTT value.  I agree that the method did improve the blood compatibility and the APPT values are within the normal range. So, I advice you to correct the imterpretation.
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