All the test that you mentioned would be beneficial in giving them more information to the cause of your CIC. I have had all three of them done. None of them are test to have done, but they do give information to rule without any obstructive cause, anatomical problems, or pelvic floor coordination that might be causing your problems. The sitz marker test will also tell them your transit time and how fast things move through your colon. All of these allow my doctors to have more information to decide if there was something that needed to be done surgically or not. Good luck to you and I hope that if you choose to do the test that they will give them more information to guide your care!