When a pedicled flap is transferred, at least 3 weeks have to elapse before its new vascular attachment is capable of perfusing the flap en-tirely on its own, and it is ready for the next stage of the transfer. Various tests have been introduced over the years, aiming to assess the efficiency of the vascular attachment in the hope of reducing this time. Each in turn has been discarded.
The question more often should be whether the trans-fer is safe at 3 weeks. In such an assessment, the extent of the