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Preparing for a Biopsy

Blood Tests Needed — Before a Biopsy

Arriving without recent blood results is one of the most common reasons a biopsy is postponed on the day. Your team needs to confirm three things before the procedure goes ahead: how well your blood clots, your blood cell counts, and whether your kidneys are working safely.

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

  • Three things are checked — Clotting, blood cell counts and kidney function — each tells the team whether it is safe to proceed.
  • Missing results can cancel the day — A biopsy will not go ahead without results the team trusts. Sorting this in advance avoids a wasted trip.
  • Results must be recent — Blood counts change, especially during cancer treatment. An old result may not reflect your current state.
  • Your centre confirms the exact list — Which tests and how recent they must be depends on the type of biopsy. Confirm this at the time of booking.
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Before most biopsies, your team will request blood tests that check three things: how well your blood clots, your blood cell counts, and how your kidneys are working. These results confirm the procedure is safe to go ahead. Your centre will tell you exactly which tests are needed and how recent they must be.

Why does a biopsy need blood tests?

A biopsy uses a needle to take a small sample of tissue from inside your body. Any needle procedure carries a small risk of bleeding. Your team needs to know that your blood will clot normally before they begin.

Your platelet count is the first concern. Platelets are the cells that seal a wound. A low count means bleeding after the needle is withdrawn takes longer to stop.

Kidney function is tested because some biopsies use imaging to guide the needle precisely. The agents used with that imaging are processed by the kidneys. An impaired kidney may not clear them safely.

These tests are not bureaucratic requirements. They are how your team identifies any precautions needed before the procedure, rather than discovering a problem once they have already begun.

Which blood tests will I need?

  • Complete blood count (CBC) — checks your platelet level, haemoglobin and white cell count
  • Clotting tests (PT and aPTT) — shows whether your blood forms a clot at the expected speed
  • Kidney function tests (creatinine and eGFR) — checks how well your kidneys are filtering
  • Blood group — sometimes requested, particularly when the biopsy site carries a higher bleeding risk

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How recent do my blood test results need to be?

TestWhy it cannot be oldAccepted timeframe
Complete blood countPlatelet and haemoglobin levels change during cancer treatmentSet by your centre — ask at booking
Clotting testsClotting function can shift between visits, especially with certain medicinesSet by your centre — ask at booking
Kidney functionKidney performance can decline during some treatmentsMore recent results usually required if you are on active treatment — confirm with your centre
Blood groupDoes not change between testsA previous result is often accepted — confirm your centre holds one on file

How do I get my blood tests ready before the biopsy?

  1. Request the test list at booking

    When you confirm your biopsy date, ask the coordinator for a written list of required blood tests or a laboratory request form. Do not wait until a few days before the appointment.

  2. Go to an accepted laboratory

    Have the blood drawn at a laboratory your centre approves. If you are unsure which laboratories are accepted, ask your coordinator before you go, so you do not have to repeat the draw.

  3. Collect your printed results

    Ask the laboratory for a printed report. Some centres require the original printed result rather than a screenshot or a summary message sent to your phone.

  4. Confirm the centre has received them

    If your centre asked for results to be sent directly by the laboratory, call to confirm receipt at least one day before your appointment — not on the morning of the procedure.

  5. Bring the results with you on the day

    Carry the printed reports to your appointment even if you submitted them in advance. This prevents a cancellation if there is an administrative gap.

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Common questions

Frequently asked questions

What if my platelet count is low — will the biopsy be cancelled?

Not automatically. A low platelet count changes the risk calculation, and your team may plan additional precautions, choose a less invasive approach, or wait until the count improves — but it does not rule a biopsy out entirely. If a low count is expected because of your current treatment, tell the coordinator at booking. This lets the team plan ahead rather than being caught short on the day. Your oncologist will review the result and discuss the options with you.

Do I need to fast before these blood tests?

For the tests most commonly requested before a biopsy — blood counts, clotting and kidney function — fasting is not usually required. Some centres include additional tests in a general pre-procedure screen that do require fasting. Confirm with the laboratory when you book your blood draw. Their instructions take priority over any general guidance you have read or been given previously.

My blood tests were done a few weeks ago. Will the centre accept them?

It depends on the type of biopsy, what the results show, and your centre's policy. Results from a few weeks ago may be accepted for some procedures but not for others, particularly if you have had treatment in the interval. Call the coordinator with the date of your tests before assuming they are recent enough. Finding out on the morning of the procedure is too late to arrange new ones.

I am taking a medicine that may affect my blood. What should I do?

Tell your biopsy team and your oncologist at the time of booking. Do not stop or adjust any medicine on your own without checking first — stopping some medicines abruptly carries its own risks. Your team will advise you specifically on whether anything needs to change before the procedure and for how long. This is one of the most important things to flag early, and it should be part of every booking conversation.

Do I pay for blood tests separately from the biopsy cost?

In most settings, yes. Pre-procedure blood tests are usually billed separately from the biopsy itself, through insurance or as an out-of-pocket expense. The amount varies by laboratory and city, and prices change over time, so confirm the cost when you book the blood draw. If cost is a concern, tell your coordinator — some centres have arrangements with specific laboratories that may reduce what you pay.

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