Hematologist
CION Cancer Clinics
Abnormal blood counts in a pre-surgery workup | CION Cancer Clinics
Usually the surgery still goes ahead, sometimes after a short delay to check or correct the result. Mild changes often need only a note in your file. A large drop in haemoglobin or platelets, or abnormal clotting tests with no clear reason, may postpone a planned operation until the cause is found. This page explains the common findings, what happens next, and what not to change on your own. At CION Cancer Clinics, our haematologist reviews abnormal blood reports with you, orders only the tests that answer your question and explains each result plainly.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What happens if your blood test is abnormal before surgery?
- Which abnormal results are found most often before surgery?
- What usually happens after the abnormal result?
- When does surgery usually go ahead, and when does it wait?
- What if the surgery is for cancer and cannot wait long?
- What do patients often misunderstand about pre-surgery tests?
- Common questions about abnormal tests before surgery
The short answer
What happens if your blood test is abnormal before surgery?
Usually the surgery goes ahead, sometimes after a short delay to correct or explain the result. Mild changes often need nothing more than a note in the file. Larger changes in haemoglobin, platelets or clotting tests may postpone a planned operation until the cause is found and made safe.
Why the tests are done at all
Before an operation, the team wants to know you can cope with some blood loss, that your blood clots normally, and that there is no hidden infection. A complete blood count and clotting tests answer much of that. The point is safety on the day, not a hunt for disease.
Why an abnormal result is often found this way
Many people have never had a blood test until a surgery is planned. So a pre-surgery workup is often the first time a long-standing low iron, a naturally low white count or a mild platelet change is noticed. Found early, most of these are simple to deal with.
What this page cannot tell you
It cannot say whether your own operation is safe. That decision belongs to your surgeon and anaesthetist, who know the operation, the urgency and your health.
Reference ranges differ between laboratories. A single result is always read alongside your symptoms and a repeat test.What turns up
Which abnormal results are found most often before surgery?
Each one is handled differently. The size of the change, and how big the operation is, decide what happens next.
Low haemoglobin
The most common finding. It often comes from low iron, heavy periods or a slow blood leak from the gut. Before a planned operation, the team may treat the cause first so you start with more reserve.
Low platelets
Platelets help blood clot. A mild drop rarely changes anything. A larger one may need a repeat, a smear to confirm it, and a plan with the anaesthetist, especially before spinal anaesthesia.
Abnormal clotting tests
PT, INR and APTT measure how long blood takes to clot. Blood thinners, liver disease or an inherited bleeding tendency can lengthen them.
The team will ask about
- Every medicine, including blood thinners
- Past bleeding after dental work or injuries
- Heavy periods or family bleeding problems
High or low white count
A raised count may mean an infection that should settle first. A low count is often a normal variant, but a big change needs looking into before a planned operation.
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Two things not to do on your own
Do not stop, skip or change a blood thinner or any other medicine because of an abnormal test or an upcoming operation. The surgeon and the doctor who prescribed it decide that together. And if you notice bleeding that will not stop, black stools, fever with shivering or sudden breathlessness while waiting for surgery, go to the nearest emergency department today, or call 108.
The usual sequence
What usually happens after the abnormal result?
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The anaesthetist or surgeon reviews it
They look at the number, how far it is from the range, your other tests and how large the operation is. Many mild results stop here.
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A repeat test or smear
A surprising result is often checked again. Low platelets are confirmed with a smear, because clumping in the tube can make the count look falsely low.
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A search for the cause
Iron studies, vitamin levels, liver and kidney tests, or specific clotting tests, depending on what was abnormal.
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A haematology opinion, if needed
For unexplained changes, several abnormal counts, or a possible bleeding disorder, a haematologist advises what is safe and what needs preparing.
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A plan for the day of surgery
That may mean treating low iron first, arranging blood to be ready, changing the anaesthetic approach, or simply going ahead as booked.
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Side by side
When does surgery usually go ahead, and when does it wait?
Often goes ahead
Often waits for answers
A mild, single change with a clear cause
Several counts abnormal with no explanation
A small operation with little expected blood loss
A major planned operation where blood loss is likely
Clotting tests explained by a medicine the team is managing
Clotting tests abnormal with no medicine to explain them
An urgent or emergency operation
A planned operation that can safely be moved
A normal smear
A smear showing unusual or immature cells
If the operation is for cancer
What if the surgery is for cancer and cannot wait long?
Cancer surgery is time-sensitive, so the team works to correct problems quickly rather than postpone for weeks. Low haemoglobin, for example, can often be improved in the time before the operation, or managed with blood kept ready on the day.
Low counts from the cancer or earlier treatment
Some cancers bleed slowly and lower haemoglobin. Chemotherapy given before surgery can lower all three counts for a while. The team times the operation for when counts have recovered enough, and explains the wait.
When a blood problem is found by chance
Occasionally a pre-surgery test shows something unrelated to the operation, such as unusual cells on the smear. That does not mean a second cancer. It does mean a haematologist should see the report, and the surgical team will decide whether the operation should wait for that answer.
Who should not rush
Anyone with an unexplained bleeding tendency, or a family member who bled badly after an operation, should not go ahead until this has been checked. Tell the surgeon early, even if your tests look normal.
Commonly believed
What do patients often misunderstand about pre-surgery tests?
"An abnormal test means the operation is cancelled."
Most abnormal results lead to a short check, a repeat test or a simple treatment, and the surgery goes ahead. A delay, when it happens, is to make the operation safer, not to refuse it.
"We will get a different lab to give a normal result."
Looking for a lab that shows a better number does not change your blood. It only hides a problem from the people who need to know about it on the day of your operation.
"Eating well for a few days will fix low haemoglobin."
Food helps over months, not days. If low iron is the cause, the team may suggest treatment that works faster. Ask before taking any supplement or tonic, because some interfere with other tests or medicines.
"The bleeding in our family is not worth mentioning."
It is one of the most useful things you can tell the team. A relative who bled heavily after an operation or tooth removal can point to an inherited tendency that routine tests sometimes miss.
Questions we are asked
Common questions about abnormal tests before surgery
Will my surgery be postponed because of low haemoglobin?
Not always. A mild drop before a small operation often changes nothing. Before a major planned operation, the team may treat the cause first, because starting with more reserve makes recovery smoother. If the surgery is urgent, they usually go ahead with blood kept ready. Your surgeon and anaesthetist decide based on your own numbers.
Can I have a spinal anaesthetic with low platelets?
It depends on how low the count is, whether it is falling, and your clotting tests. Anaesthetists are more careful with spinal and epidural injections when platelets are low, because of a small risk of bleeding near the spine. They may choose a general anaesthetic instead. Ask them to explain the choice.
My INR is high. Is it because of my blood thinner?
Often yes, if you take warfarin or a similar medicine, since that is how those medicines work. Liver problems and some antibiotics can also raise it. Do not stop or change your blood thinner on your own. The surgeon and the doctor who prescribed it will plan when and how it is paused.
Do I need to see a haematologist before my operation?
Only if the result is unexplained, large, affects several counts, or suggests a bleeding or clotting disorder. Most abnormal pre-surgery results are handled by the surgeon, physician and anaesthetist. If a haematology opinion is asked for, take every report and a list of your medicines to that visit.
Can a pre-surgery blood test show cancer?
A routine blood count is not a cancer test. It sometimes shows changes, such as unusual cells on the smear, that lead to further checks. Most abnormal results before surgery turn out to have ordinary causes. If further tests are suggested, ask what each one is looking for.
What is a group and save or crossmatch?
These are blood bank tests. A group and save finds your blood group and checks for antibodies, so blood can be found quickly if needed. A crossmatch tests specific units of blood against yours so they are ready. Neither means you will definitely need a transfusion.
Should I stop my iron or vitamin tablets before surgery?
Ask your surgeon or anaesthetist rather than deciding yourself. Most iron and vitamin tablets are simply continued, but the team needs a full list of everything you take, including herbal and ayurvedic remedies, because some affect bleeding. Bring the packets or photographs of them to the pre-surgery visit.
Will insurance still cover the surgery if it is delayed?
A delay for medical reasons does not usually cancel cover, but pre-authorisation dates can expire. Tell your insurer or TPA desk if the date changes. Aarogyasri, CGHS, ECHS, EHS and PM-JAY have their own rules, which change over time, so check the current rules for your scheme with the hospital's insurance desk.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Where to find us
Our centres in and around Hyderabad
Addressed by landmark, because that is how this city navigates. A haematology consultation can be booked at any of these centres through one helpline, and your team will tell you where each test or treatment takes place.
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Vizag
Sources
- NHS — Blood tests
- American Society of Hematology — Blood disorders: patient education
- National Heart, Lung, and Blood Institute — Health topics
- National Health Mission — National Health Mission
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Low Platelets on a Routine Report: First StepsIf platelets were the abnormal resultWhen a Repeat Blood Test Is Enough and When It Is NotWhether a recheck will settle the questionWhich Doctor for an Abnormal Blood ReportWhen the surgeon asks for a specialist opinionAbnormal Blood Counts: What the Numbers MeanThe guide to every line on your report
Talk to us
Surgery on hold because of a blood test?
Share the report with us. CION's haematology team will read it and tell you what needs sorting before the operation. One helpline serves every CION centre.