Rescheduling or Missing — a Chemotherapy Appointment

A single brief delay, managed by your team, is unlikely to change the overall aim of your treatment. Chemotherapy schedules are built with this kind of flexibility in mind, and your oncologist will adjust the plan accordingly. What the evidence is clearer about is that multiple unplanned gaps — or stopping treatment without discussion — carry more risk than one rescheduled session. If you are worried about the impact of a specific delay, ask your oncologist directly. They can explain what the schedule is designed to achieve and how any adjustment affects it.

The day before is the practical minimum. Earlier is always better — it gives the team time to fill the slot for another patient and to find the next available time for you. If something happens on the morning of the appointment, call immediately rather than waiting until later in the day. Same-day notice is still better than silence, and your team would rather hear from you early than find an empty chair at the scheduled time.

You call to request the change, but the new date is confirmed by your team rather than chosen by you alone. The timing is clinical — your team needs to check where you are in your cycle, whether your blood results will still be valid, and what slots are available in the day-care unit. In practice this is usually a short conversation with your nurse coordinator, not a decision that needs to go to the doctor, unless you are rescheduling because you are unwell.

Yes, and this distinction matters. If you are unwell on the day of treatment, call your team before you would have left for the appointment. They need to know whether the illness could be a side effect of your treatment — in which case it may change your care plan, not just your schedule. Do not assume that feeling unwell simply means moving the date. Your team will guide you on whether you need to be seen the same day, by whom, and when it is safe to come back for treatment.

Tell your team about the pattern, not just each individual change. Repeated rescheduling is often a sign that something needs addressing — practical barriers like transport or work leave, side effects that are building up, or anxiety about attending. All of these are things your team can help with, and none of them are reasons to stop coming without a conversation. Your nurse coordinator is a good first person to speak to honestly about what is making attendance difficult.