Hi @Nat79 and unfortunately welcome.
Your Oncologist will probably want you to have blood tests before starting chemotherapy.
mine gave me a referral with 6 repeats on it to have on hand as you have a blood test after every chemo cycle. If you have anything come up abnormal you may have more than one between cycles.
Depending on the type of Chemo you will be having, you may be sent for an Echocardiogram to check your heart. I did because one of the possible long term side effects of the first chemo was heart damage and my family had a history of heart problems.
Your Oncologist may ask you if you have any family history of various problems, so it may pay to check with the family if you don't know. It wasn't until I started asking that I found out that both my parents and my sister have arrhythmia, my uncle has a pacemaker and my grandfather had a history of heart problems before dying of a heart attack.
You might like to see the dentist for a clean if you are due, not something you will want to do on chemo.
I also was due for an eye test which I was glad I had as chemo really mucked around with my vision for the first two weeks after chemo on the first type (FEC)
Good luck with your on going treatment.