Yes, three weeks is an appropriate time period to repeat an ACTH stimulation test to see if the Trilostane dose needs to be modified. The blood test should be done 4-6 hours after the Trilostane dose.
Kimberly Coyner, DVM DACVD
That's great that she's responding so well! As Dr. Coyner stated, the ACTH stimulation test should be done 4-6 hours after the dose (Ideally, 4 hours). It should be done at 4 weeks, 12 weeks, and then every 3 months thereafter. You can also have your vet call Dechra (the company that makes it) for more info. Hope that helps!
I read the instructions in the pill box and they agree with what you said about testing at 3-4 weeks. My vet wants to wait for two months. I don't think he is too familiar with Trilostane, but I don't want to tell him what to do. I assume that waiting the extra month won't hurt, or will it?
According to the company, you are supposed to test: at 10 days, 4 weeks, 12 weeks after starting Vetoryl® treatment and then every 3 months. At these time points we recommend that you:
• ASSESS CLINICAL SIGNS
• ACTH stimulation test 4-6 hrs post-capsule – aim to always start the ACTHST (i.e. take the pre-ACTH blood) 4 hrs post-Vetoryl capsule.
• Routine haematology and biochemistry
Waiting till 2 months will be too far out.