Fasting Before Spleen Removal (Splenectomy)

Spleen removal (splenectomy) is done under general anaesthetic, either by keyhole (laparoscopic) surgery or as an open operation. Because the spleen helps fight infection, this surgery comes with two distinctive extras: <strong>vaccinations beforehand</strong> and <strong>lifelong infection precautions afterwards</strong>.

Fasting for this procedure

Your splenectomy will be done under a general anaesthetic, so you will be fully asleep and your stomach must be empty to keep you safe. Follow the standard rule unless your team tells you otherwise: stop eating solid food (and milky drinks) about 6 hours before your arrival time, and stop clear fluids — water, black tea or coffee, clear squash — about 2 hours before. Sips of water to take essential tablets are usually fine. If a child is having their spleen removed, use the 6-4-2 rule (food and formula 6 hours, breast milk 4 hours, clear fluids 2 hours) and see our child fasting calculator. Staying gently hydrated with clear fluids up to the 2-hour mark helps you feel better afterwards.

Medicines to check

Vaccinations come first. For planned splenectomy you should receive pneumococcal, meningococcal (MenACWY and MenB), Hib and annual flu vaccines, ideally at least 2 weeks before surgery so your immune system responds well — your team will arrange these, so ask if they are booked.

Blood thinners need a plan. Anticoagulants such as warfarin, apixaban, rivaroxaban or clopidogrel raise bleeding risk during this abdominal surgery and are usually paused for a set time beforehand — never stop them on your own. Aspirin is handled case by case: if you take it to protect your heart or a stent it is often safer to continue it, so follow your team's specific instruction rather than assuming it stops. Check the timings on our medications to stop before surgery page and confirm the plan with your surgeon.

Diabetes medicines change on the day. Tablets such as metformin and the newer 'flozins', plus insulin doses, are adjusted while you fast. Read our diabetes tablets before surgery guide and confirm your plan.

Take your usual heart, blood-pressure and breathing medicines with a small sip of water on the morning of surgery, unless you have been told to hold a specific one.

Bring every medicine, inhaler and supplement in its box, including anything bought over the counter or herbal, so the team has an accurate list.

Standby antibiotics may be prescribed for you to keep at home afterwards — ask your team how and when to start them if you feel unwell.

When this surgery may be delayed

You have a fever, cough, urine infection or any active infection — with a reduced or absent spleen, infections are taken very seriously and surgery is usually delayed until you are well.

Your pre-surgery vaccinations have not yet been given or are too recent — teams prefer them in place (ideally 2 weeks ahead) before a planned splenectomy.

Your blood counts are off — a very low platelet count (common in ITP) may need treatment such as steroids, immunoglobulin or a platelet transfusion arranged before you go ahead.

Blood thinners have not been stopped for long enough, leaving your bleeding risk too high for safe abdominal surgery.

You did not follow the fasting instructions, so there is food in your stomach and the anaesthetic cannot be given safely.

Reports & documents to carry

Your vaccination record or the letter confirming which pre-surgery vaccines you have had and when.

A full list of your medicines, especially any blood thinner, with the agreed stop and restart dates.

Recent blood test results if you have them, particularly platelet and full blood counts.

Any scans or reports about your spleen (ultrasound or CT) and the letters explaining why you need the operation.

Your admission letter, photo ID, and the name and number of someone who can collect you and stay overnight.

What to ask your anesthesia team

Have all my recommended vaccines (pneumococcal, meningococcal, Hib, flu) been given, and do I need any booster doses later?

Will my operation be keyhole or open, and how does that change my recovery and hospital stay?

Exactly when should I stop my blood thinner — and should I keep taking my aspirin — and will I need bridging injections beforehand?

What lifelong infection precautions will I need — daily preventive antibiotics, standby antibiotics, and a medical alert card or bracelet?

What warning signs of serious infection should send me straight to hospital after I go home?

Your prep checklist

Tick things off as you sort them — saved on this device only, nothing is sent anywhere.

A general guide — your hospital's own instructions always come first.

Frequently asked questions

Why do I need vaccinations before my spleen is removed?

The spleen is a key part of your immune system, especially against bacteria like pneumococcus, meningococcus and Hib. Without it you are at higher lifelong risk of severe infection. Giving the pneumococcal, meningococcal, Hib and flu vaccines before a planned splenectomy — ideally at least 2 weeks ahead — lets your immune system build protection while it is still strong, so you are safer once the spleen is gone.

How long will I stay in hospital after a splenectomy?

It depends on the approach. Keyhole (laparoscopic) splenectomy often means a 2 to 3 day stay, while open surgery or a removal of a very large spleen may need 5 to 7 days or more. Your recovery also depends on why the spleen was removed and your overall health. Your surgeon will give you a personalised estimate, and you should arrange for someone to take you home and stay with you the first night.

Do I really have to stop my blood thinner before surgery?

It depends on which one. Splenectomy is abdominal surgery and the spleen has a rich blood supply, so bleeding risk is real, and anticoagulants such as warfarin, apixaban, rivaroxaban and clopidogrel are usually paused so the operation can be done safely — some people need short-acting injections to bridge the gap. Aspirin is different: if you take it for your heart or a stent, your team may well tell you to keep taking it, because stopping suddenly carries its own risk. Never start or stop these on your own — the exact plan matters. Follow our medications to stop before surgery guidance and your surgeon's instructions.

What infection precautions will I need for the rest of my life?

After your spleen is removed you stay at higher risk of serious infection forever. Most people are advised to keep vaccinations up to date (including yearly flu and pneumococcal boosters), carry a splenectomy medical alert card or bracelet, and keep standby antibiotics at home to start at the first sign of infection. Many are also offered daily preventive antibiotics. Always seek urgent help if you develop a fever or feel suddenly very unwell.