CION Ameerpet
Diagnosis & Tests — Cluster B · Guide for Newly Diagnosed Families
Blood tests for childhood cancer — CBC & blood film explained
If your child's doctor has ordered a blood test for leukemia, or if you have just received an abnormal CBC result, this page will help you understand what was measured, what the numbers mean, and what comes next. A blood count is not a diagnosis on its own — but it is the most important first step in ruling out or identifying childhood blood cancer.
- CBC explains the core numbers — red cells, white cells, and platelets, all measurable from a single blood draw
- Blood film goes deeper — a specialist looks at individual cells to spot abnormal blast cells linked to leukemia
- Abnormal does not mean confirmed cancer — many treatable conditions cause similar results; a specialist reviews the full picture
- Free first consultation at CION — bring your child's CBC report; our haematology team will review it with you the same day
17+
Cancer Specialists
on Panel
on Panel
96.9%
Breast Cancer
Survival Rate*
Survival Rate*
15,000+
Patients
Treated
Treated
4.8★
Google Rating
(800+ reviews)
(800+ reviews)
Understanding the tests
What a CBC and blood film actually tell us about your child
When a doctor suspects a blood cancer such as leukemia, the first investigation is almost always a Complete Blood Count (CBC). This single blood test measures the three main types of cells produced in the bone marrow, and it can reveal disruptions in that production that occur when leukemia cells start to crowd out healthy cells. A blood film — sometimes called a peripheral smear — goes one step further by having a specialist look directly at the cells under a microscope.
Together, these two tests provide the foundation for diagnosis. They do not replace a bone marrow biopsy, which is the definitive test for leukemia — but they are fast, inexpensive, and can flag serious abnormalities within hours of the blood draw.
What the CBC measures — a parent's guide to the numbers
The CBC report will have several columns of numbers. The three most important sections are:
| Component | What it measures | Why it matters in leukemia |
|---|---|---|
| Red blood cells (RBC) & Haemoglobin (Hb) | The cells that carry oxygen to every organ; haemoglobin is the protein inside them that does the carrying | In leukemia, the bone marrow makes too few healthy red cells. Low haemoglobin causes pallor, tiredness, rapid heartbeat, and breathlessness — symptoms many parents first notice |
| White blood cells (WBC) & Differential | The cells that defend against infection. The differential breaks down which types are present: neutrophils, lymphocytes, monocytes, eosinophils, basophils | In leukemia, the white count can be very high (too many abnormal cells) or surprisingly low (the marrow is too crowded to make normal defenders). Either extreme is abnormal. The differential may reveal blast cells — immature leukemia cells that should not be in the bloodstream |
| Platelets (Plt) | Tiny cell fragments that clump together to form blood clots and stop bleeding | A low platelet count (thrombocytopaenia) causes easy bruising, petechiae (tiny red spots), prolonged bleeding from minor cuts, and spontaneous nosebleeds — often the first sign a parent notices before any blood test is done |
Important: Normal reference ranges on a CBC report are set for adults in many labs. Children's normal values differ by age — particularly for haemoglobin and white cell count. Always ask a doctor or specialist to interpret your child's result in the context of their age, weight, and clinical picture. A number that looks "slightly low" on the adult reference scale may be normal for your child, and vice versa.
What a blood film adds — looking at cells directly
After the CBC, a haematologist or pathologist places a thin smear of the child's blood on a glass slide, stains it, and examines it under a microscope. This is the blood film, and it adds information the automated CBC machine cannot provide:
- Cell shape and appearance — the machine counts cells; the specialist looks at whether they appear healthy or distorted
- Blast cells — immature blood cells that belong in the bone marrow, not the bloodstream. Their presence on a blood film is a strong signal for leukemia, though their absence does not rule it out
- Cell proportions — whether the types of white cells are in the ratios expected for a healthy child, or whether one type is crowding out others
- Red cell shape — in some blood disorders, red cells appear misshapen, fragmented, or unusually small or large, giving clues about what is causing the anaemia
The blood film result is reported by a trained person, not a machine. At CION, our laboratory results are reviewed by specialist oncologists before being discussed with you — you will always hear the result explained in plain language.
See our full guide: Pediatric Cancer — Warning Signs, Diagnosis & Care at CION | If your child had bruising before the blood test, also read: Easy bruising & petechiae in children
Did you know?
Leukemia is the most common cancer diagnosed in children and adolescents, accounting for approximately one in three childhood cancer cases in India. The most frequent form, Acute Lymphoblastic Leukaemia (ALL), typically produces an abnormal CBC — often a very high white blood cell count, low haemoglobin, and low platelets — that a doctor can detect with a single blood draw. Early detection, confirmed by bone marrow biopsy and followed by timely specialist treatment, is directly associated with better outcomes. Source: Indian Council of Medical Research (ICMR) National Cancer Registry Programme.
12+ Centres in Hyderabad · Pick yours
CION cancer care is closer than you think.
We're never more than 30 minutes away. Same panel of specialists at every centre. Same tumour board reviews. Same NCCN protocols. Pick the closest one and call directly — or let us pick for you.
CION Ameerpet
CION Kukatpally
CION L.B. Nagar
CION Tolichowki
CION Masab Tank
CION Banjara Hills
CION Kompally
CION Balanagar
CION Siddipet
CION Sangareddy
Not sure which centre fits best? Tell us where you are — we'll suggest the closest one with the right specialists.
Help me pick the right centre
Beyond Hyderabad
35+ centres across Telangana & Andhra Pradesh
Travelling for treatment? We may have a centre right where you are.
Telangana
Andhra Pradesh
Don't see your city? Call 18002028726 — we'll find your nearest CION partner centre.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Interventional Radiologist
Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
You deserve a clear answer — not more uncertainty
Our team reviews every blood count with the same attention a doctor gives a child in the room. You will leave knowing what the numbers mean and exactly what happens next — in one 45-minute consultation.
Step-by-step at CION
What happens after an abnormal blood count in a child
An abnormal CBC does not mean your child definitely has leukemia. It means the next step must happen quickly. Here is the exact sequence our specialist team follows — from receiving the blood result to giving you a clear diagnosis and a treatment plan, with no unnecessary waiting and no steps skipped.
CBC and blood film review by a specialist — same day
When you bring your child's CBC to CION, our oncologist does not just read the printed numbers — we review the blood film alongside it. Many general laboratories report a CBC without a specialist looking at the actual cells. At CION, every result with abnormal flags is reviewed by an oncologist who interprets the white cell differential, looks for blast cells on the film, and considers the numbers in the context of your child's age and symptoms. You will not be handed a report and left to search online for what it means. We walk you through it, line by line, in plain language.
Additional blood tests to assess the whole picture
If the CBC raises concern, we request targeted additional tests — not a blanket panel that burdens your family unnecessarily. These typically include liver and kidney function tests, uric acid levels, lactate dehydrogenase (LDH), and inflammatory markers. These tests tell us how the body is responding to whatever is happening in the bone marrow, and they help us plan treatment safely if leukemia is confirmed. We only order what we genuinely need, and we explain why each test was chosen. Decisions for healing, not billing — that is the CION commitment.
Bone marrow aspiration and biopsy — the definitive test
The CBC and blood film together create a strong suspicion, but only a bone marrow biopsy gives a definitive diagnosis. In this procedure, a small sample of marrow is taken from the back of the hip bone under sedation or anaesthesia. The child feels nothing during the procedure. The sample is then sent to our laboratory for several analyses: cell morphology (what the cells look like), immunophenotyping (which markers are on the cell surface, identifying the exact leukemia subtype), cytogenetics (whether specific chromosomal changes are present), and molecular tests (which detect gene mutations that affect treatment choice and prognosis). We explain everything before the procedure — what to expect, how long it takes, and what the child will feel when they wake up.
Tumor board review before any treatment decision
At CION, no child begins cancer treatment based on one doctor's opinion alone. Once all results are in — CBC, blood film, bone marrow biopsy, cytogenetics, and molecular tests — the case is presented to our multidisciplinary tumor board. This is a formal meeting of medical oncologists, haematologists, radiation oncologists, and supporting specialists who review the complete picture together and reach a consensus on diagnosis and the most appropriate treatment plan. This team approach means no single perspective is missed, and it protects your child from receiving the wrong treatment for the wrong diagnosis. You will then receive a clear, written summary of what was found and what the plan is.
Transparent cost discussion before treatment begins
We do not present a treatment plan without also being honest about what it will cost. Before your child begins any therapy, a CION counsellor meets with your family to go through the expected costs of the full treatment course, which insurance is accepted, whether Aarogyasri or CGHS / ECHS coverage applies to your case, and what EMI or financial support options are available. We believe that a family who understands the financial picture from the start is better able to focus on their child's recovery — not distracted by unexpected bills. There are no hidden charges at CION. Transparent costs, always.
Ongoing CBC monitoring throughout treatment
Once treatment begins, the CBC becomes one of your most important tools for tracking how your child is responding. Blood counts are checked at regular intervals throughout the treatment course — before each cycle of chemotherapy, during periods of expected low blood counts (called nadir), and whenever your child develops a fever or concerning symptom. Over time, you will learn to read these numbers yourself. Our team encourages this — an informed parent is a more confident partner in their child's care. We will always be available to explain any result and to decide together what, if anything, it means for the next step of treatment.
15,000+ patients and families supported
You are not alone in this
Many CION families came to us with a confusing blood result and left with clarity, a plan, and a team walking alongside them. Your first consultation is free, confidential, and without any pressure.
Real Stories. Real Voices.
15,000+ patients chose CION. Hear from them directly.
These aren't paid endorsements or written reviews. These are video testimonials from real patients and families — recorded on their own phones, in their own words. Pick any one. Watch it. Then decide.
4.8★800+ Google reviews
50+video testimonials
15,000+patients treated
Read all 800+ reviews on Google
Start Your Story. Book Free Consultation.
Common questions
Blood tests for childhood cancer — questions parents ask us
What is a CBC and why is it done when childhood leukemia is suspected?
A CBC (Complete Blood Count) measures the three main cell types in the blood: red blood cells, which carry oxygen and are counted via haemoglobin and haematocrit; white blood cells, which fight infection; and platelets, which control bleeding. In a child with suspected leukemia, the CBC is the first and most important test because leukemia begins in the bone marrow — the factory that makes blood cells. When leukemia cells crowd the marrow, they disrupt normal blood production, causing haemoglobin to fall (causing paleness and tiredness), platelets to drop (causing easy bruising or bleeding), and the white cell count to become abnormal — too high, too low, or with abnormal cell types. A single CBC can flag all three of these abnormalities within a few hours.
What does a blood film (blood smear) show that a CBC does not?
A CBC gives you counts and averages. A blood film lets a trained haematologist or pathologist actually look at individual blood cells under a microscope. In leukemia, the blood film may reveal blast cells — immature, abnormal white blood cells that have spilled out of the bone marrow into the bloodstream. The shape, size, and staining pattern of these cells give important clues about the type of leukemia. Not every leukemia case shows blast cells on a blood film (sometimes the marrow is involved but the peripheral blood still looks relatively normal), which is why a bone marrow biopsy is done to confirm the diagnosis. But when blast cells are visible on the film, it is a strong and urgent signal.
What blood test numbers are abnormal in a child with leukemia?
There is no single threshold that confirms leukemia — the pattern matters more than any single number. Common findings include: haemoglobin below the normal range for the child's age (typically below 10–11 g/dL in children, though normal ranges vary by age and laboratory); a very high or very low white blood cell count, sometimes dramatically elevated into the tens or hundreds of thousands; and a low platelet count, sometimes below 50,000 per microlitre. What most strongly suggests leukemia is not just low or high counts but the combination of all three being abnormal together, especially with abnormal cell types visible on the blood film. Your child's doctor or specialist will interpret the result in the context of symptoms and examination — a single abnormal number alone does not confirm cancer.
My child's CBC came back abnormal. Does that mean it is definitely leukemia?
Not necessarily. An abnormal CBC has many causes: viral infections (including Epstein-Barr virus, the virus behind glandular fever, can cause a very high white count and an abnormal blood film); bacterial infections; nutritional deficiencies; autoimmune conditions; and non-cancerous blood disorders such as immune thrombocytopaenia. What an abnormal CBC does mean is that further evaluation is needed without delay. Your doctor will review the result alongside your child's symptoms, do a careful physical examination, and likely request a blood film review and further blood tests. If those remain concerning, the definitive next step is a bone marrow biopsy — a procedure done under sedation that examines the marrow directly and gives a definitive answer. Please do not panic, but do not wait either. Get seen by a specialist quickly.
How quickly should I act if the CBC is abnormal?
If a doctor has told you the CBC is abnormal and has referred your child for further evaluation, you should seek that follow-up within a few days — not weeks. Childhood leukemia can progress, and early diagnosis allows treatment to begin before complications develop. If you have been told the result is abnormal but you have not yet been referred, call your doctor again and ask directly whether a paediatric oncologist or haematologist should see the report. If you are uncertain, you are welcome to bring the CBC result to CION Cancer Clinics — our oncologists will review it with you in a free first consultation. You do not need a formal referral to speak to us.
What happens after the CBC if leukemia is suspected?
After an abnormal CBC and blood film, the sequence at a specialist centre typically follows these steps. First, additional blood tests to check kidney function, liver function, uric acid, and other markers that help assess the body's overall state. Second, a bone marrow aspiration and biopsy — the definitive diagnostic test. A small sample of marrow is taken from the back of the hip bone under sedation; the child does not feel pain during the procedure. The marrow sample is sent for multiple analyses including cell morphology, immunophenotyping (which identifies the exact type of leukemia cell), cytogenetics (which looks for chromosomal changes), and molecular tests. These results together determine the exact leukemia type and guide the treatment plan. At CION, every case is reviewed by a multidisciplinary tumor board before treatment begins — we do not make these decisions alone.