Building up your haemoglobin before cancer surgery | CION Cancer Clinics

If your haemoglobin is low because of low iron, iron tablets or an iron drip prescribed by your doctor can raise it in the weeks before surgery. The drip usually works faster. Food helps over time but cannot correct a real shortage quickly on its own.

Why it matters before an operation

Haemoglobin carries oxygen around your body. Starting surgery with a low level leaves less in reserve if you bleed, makes a transfusion more likely, and can leave you more tired during recovery. Guidance from the UK recommends checking for it and treating it before planned surgery.

First, find the cause

A low haemoglobin is a finding, not a diagnosis. In cancer it is often due to slow bleeding from the tumour, poor eating, or the illness itself affecting how the body uses iron. The treatment depends on which of these it is, and guessing wrongly wastes weeks you may not have.

Who iron does not help

If the cause is not low iron, iron will not raise your haemoglobin, and too much can harm. That is why blood tests come before any tablets.

If you are the son or daughter arranging things

Ask for the blood test to be done at the very first visit, not a few days before the operation. Every week between the test and the surgery is a week in which treatment can work. Keep a copy of each report, because the doctor will want to compare the numbers. If your parent is weak, breathless or dizzy while waiting, tell the team rather than waiting for the next appointment.

An iron drip is widely used, but it is not for everyone. Your doctor will check before prescribing it.

When a drip may not suit you

It is usually avoided during an active infection, in the early months of pregnancy, when iron stores are already high, and in people who have reacted badly to iron before. Tell the team about allergies, asthma and liver problems.

When iron is not the answer

If there is no time before an urgent operation, a transfusion may be the safer way to raise haemoglobin. If the bone marrow is the problem, a medicine called erythropoietin is sometimes considered, though it is not suitable for every cancer. If the problem is low vitamin B12 or folate, those are replaced instead. If the tumour itself is bleeding, the operation to remove it may be the most direct way to stop the loss, and the team may decide not to wait.

What this page cannot tell you

It cannot tell you what level your haemoglobin should reach, which iron product you need, or whether your surgery should wait. Those depend on your cancer, your heart and the operation.