The
Oxford Diagnostic Laboratory FAQs are worthy of closer examination; they claim that
A blood specimens would be rejected if:
* Received more than 32 hours from the time of collection
This is inconsistent with the FDA approved
Package Insert
Blood samples should be processed within 8 hours.
and the T-Spot.TB
FAQ
Blood samples should be processed within 8 hours.
Perhaps they have mixed up the T-Spot North American site with the
International site where 32 hours is given as the time.
Addition of the T-Cell Xtend reagent (available from Oxford Immunotec) to the sample immediately prior to processing allows samples to be run in the T-SPOT.TB assay up to 32 hours after they have been collected.
Not only is
T-Cell Xtend not approved for use in the USA the
performance specifications are quite different.
