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Preparing for a biopsy

Your Biopsy Preparation — A Card to Print and Carry

Getting the preparation wrong is the most common reason a biopsy is cancelled on the day. This card summarises what to do and when — so you arrive ready and your procedure goes ahead.

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026

  • Cancellation is avoidable — Most same-day cancellations happen because of preparation errors, not clinical problems.
  • Fasting times vary — Your centre will tell you exactly when to stop food and when to stop fluids at booking.
  • Some medicines may need pausing — Your doctor decides which ones and when — this is not something to manage on your own.
  • Bring someone with you — You may not be able to drive or travel alone in the hours after the procedure.
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Biopsy preparation covers three things: what to stop beforehand, what to bring, and what times to track. Your centre confirms the exact instructions when you book — this card is the framework. The two deadlines that matter most are your fasting time and your arrival time. Both must be kept for the procedure to go ahead.

What does biopsy preparation actually involve?

Preparation covers what to stop before the procedure, what to bring on the day, and which times to watch. Your centre gives you the exact instructions at booking — this card is a framework to work from, not a substitute for those instructions.

The two times that matter most are your fasting deadline and your arrival time. Fasting requirements vary by procedure and by whether sedation is used — your centre will tell you when to stop food and separately when to stop fluids, because the two deadlines are sometimes different.

Some people are also told to pause medicines that affect how blood clots. Your doctor decides which medicines apply to you and from when. If you were not given clear guidance on this at booking, call and ask before the day — not on the morning of the procedure.

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What are the steps to prepare for a biopsy, in order?

  1. At booking

    Confirm your centre's fasting instructions — when to stop food and when to stop fluids. Ask whether any of your current medicines need to be paused, and if so, exactly when to stop them. Find out what time to arrive and whether you need to bring someone with you.

  2. Two or more days before

    If your team has told you to pause any medicines before the procedure, this may be the window to stop them. The timing depends on the medicine and the procedure — follow what your team told you at booking, not a general guide.

  3. The evening before

    Stop eating at the time your centre specified. Note the fluids deadline separately if one was given — it is sometimes later than the food deadline. Lay out everything you need to bring so you are not searching in the morning.

  4. The morning of the procedure

    Take only the medicines your team has explicitly told you to continue that day. Wear loose, comfortable clothing with easy access to the biopsy site. Leave jewellery and valuables at home.

  5. Arriving at the centre

    Bring your referral letter, a written list of your current medicines, any recent scan reports, and your ID. Tell the team immediately if anything has changed — if you ate or drank after the fasting deadline, felt unwell overnight, or took a medicine you were meant to pause.

  6. After the procedure

    You may be asked to stay for a period of observation before leaving. Before you go, get a written list of symptoms to watch for at home and a direct number to call if anything concerns you in the hours after.

Did you know?

Preparation failures — most often incomplete fasting or medicines not paused as directed — are among the most common reasons image-guided biopsies are cancelled on the day of the procedure.

When a biopsy is cancelled, rescheduling typically adds weeks to the wait for a diagnosis. The instructions your centre gives you at booking are clinical requirements, not optional reminders.

Source: Society of Interventional Radiology procedural safety guidelines

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Common questions

Frequently asked questions

What if I was not given clear fasting instructions when I booked?

Call your centre before the day and ask. Fasting requirements depend on the type of biopsy, the site being sampled, and whether sedation will be used — so a single general rule does not apply to every procedure. Your centre will give you the exact times for your specific case. Do not follow instructions you found online as a substitute for what your centre tells you.

Can I take my regular medicines on the morning of the biopsy?

Some medicines can be continued and some need to be paused — which applies to you depends on the medicine and the procedure. Your care team will tell you at booking which ones to take, which to pause, and from when. Do not stop or adjust any medicine on your own. If you were not given clear guidance, call your centre before the day. On the morning, take only what you have been explicitly told to continue.

Do I need to bring someone with me to the biopsy?

In most cases, yes. Many biopsy procedures involve sedation or local anaesthesia, and you may not be in a position to drive or travel alone afterwards. Bring someone who can stay until the procedure is complete and take you home. If coming alone is unavoidable, discuss this with your centre in advance so they can advise whether any alternative arrangement is possible.

What if I accidentally ate or drank something after the fasting deadline?

Tell your team as soon as you arrive — before the procedure starts. Do not try to manage it yourself or hope it goes unnoticed. Fasting requirements exist for safety, and proceeding without disclosing a breach can put you at risk. In most cases the procedure will need to be rescheduled. That is frustrating, but it is the safe decision. Your team will not judge you for the mistake — they will help you rebook.

What should I watch for at home after the biopsy?

Before you leave the centre, ask for a written list of what to watch for and a direct number to call. Common things to report include bleeding that does not settle, increasing pain or swelling, fever, or any symptom that gets worse rather than better in the hours after the procedure. Keep the contact number with you for at least the first day. If you are ever unsure whether something is normal, call rather than waiting to see.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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