We don't put people we care about and work with on notice! We let them in on our plans and what we're thinking and let them contribute what they see and are thinking and then both understand where the other is coming from and what they value and plan, etc. If it is going to impact therapy one discusses it with one's therapist.

CE: I'm going to be calling this week to make an appointment to be tested and I want to pay for the test by missing a week of therapy. What are your thoughts on that?

T: I really think it would be good to have testing and therapy, so I'm willing to consider the testing helpful to our work here and will, instead, not charge you for the week in which you have the testing. I'm quite interested in hearing about the experience for you and how the results might help us in our work here.

Or:

T: That seems like a smart way to pay for the testing, maybe we can work this week on figuring out things you can do on your own so the missed session won't impact the flow of what we are doing here, now?