How Long Is Pre-Op Before Surgery in the UK?

In the UK, a pre-operative assessment (pre-op) usually takes place between 1 and 4 weeks before your surgery date. However, the exact timing can vary depending on:

• The type of surgery you're having

• Your current health and medical history

• NHS hospital policies or private clinic timelines

• Whether it's an urgent or elective (planned) procedure

For major operations, you may be called in earlier — particularly if tests or referrals are needed before the go-ahead is given.

What Is a Pre-Op Assessment?

A pre-op assessment is a health check carried out before surgery to make sure you’re fit for anaesthetic and the procedure itself. It's done to minimise the risk of complications during and after surgery.

It usually includes:

• A medical history review

• Blood pressure, heart rate, and oxygen level checks

• Blood tests and/or ECG (heart test), if needed

• MRSA screening

• Medication review

• Height, weight, and BMI measurements

• COVID-19 screening (if required)

It’s also a chance for you to ask questions and for the team to give you important instructions, such as when to stop eating and drinking before surgery (known as fasting).

How Long Does a Pre-Op Appointment Take?

Most pre-op appointments last around 30 to 90 minutes, depending on your individual health and the complexity of the procedure. You may also be given leaflets or advice on how to prepare at home — such as stopping smoking, losing weight, or adjusting medications.

Do You Always Have a Pre-Op?

Yes — for nearly all types of surgery, whether it’s under general anaesthetic or sedation, you’ll have some form of pre-operative check. In some straightforward cases (like day surgery), this might be a telephone or video consultation, especially if you’re generally fit and healthy.

What If You’re Unwell Before Surgery?

If you develop a cold, chest infection, or other illness after your pre-op, it's important to inform your surgical team as soon as possible. Surgery might be postponed if there’s a risk of complications.

Final Thought

In the UK, a pre-op usually happens 1 to 4 weeks before surgery, and is an essential step in making sure your operation is safe and successful. It’s your opportunity to ask questions, get clear on what to expect, and make sure your health is fully assessed before the big day.