"If it means one extra person gets checked, and it extends one person's life, that's great," he said en route to hospital yesterday.
The operation is due to take place on Friday.
In 2005, Mr Carter underwent surgery for bowel cancer at Wellington's Wakefield Hospital.
Thirty centimetres of bowel was removed but, because he had sought medical advice as soon as he noticed something was wrong, no chemotherapy or radiation was required.
In that case, too, he went public with his health issues in the hope of prompting others to be proactive.
Kiwi men aged over 40 are advised to have regular prostate PSA tests if they have a family history of the cancer. Otherwise, regular tests are recommended between the ages of 50 and 70.
In its early stages, prostate cancer usually has no symptoms. Once symptoms appear it can be too late to cure.
Anyone with blood or pus in their urine, or problems passing urine, should see a doctor without delay.
See prostate.org.nz for more information.