Final answer:
Inflammation and scarring of the reproductive organs, particularly the fallopian tubes, may be contributing to the infertility of a patient who has had PID in the past. Diagnostic tests should be performed to determine if there are any structural problems or blockages in the reproductive tract.
Step-by-step explanation:
One factor that may be contributing to the infertility of a patient who has had pelvic inflammatory disease (PID) in the past is the inflammation and scarring of the reproductive organs, particularly the fallopian tubes. This can lead to blockages that prevent the sperm from reaching the egg or the fertilized egg from implanting in the uterus. The next step would be to perform diagnostic tests to determine if there are any structural problems or blockages in the reproductive tract.