Hematologist
CION Cancer Clinics
A plain-language glossary for your blood report | CION Cancer Clinics
A blood count report describes three families of cells: red cells, which carry oxygen; white cells, which fight infection; and platelets, which help blood clot. Most other words describe their size, shape or number. This glossary explains haemoglobin, MCV, RDW, TLC, the differential count, platelets and smear comments in plain language, and gives a simple order to read your report in before you see a doctor. 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 do the words on a blood report mean?
- What do the red cell lines mean?
- What do the white cell words mean?
- What do the platelet and smear terms mean?
- In what order should you read a blood report?
- What do people misread on a blood report?
- What should you do once you understand the words?
- Common questions about blood report terms
The short answer
What do the words on a blood report mean?
A complete blood count report lists three families of cells: red cells, which carry oxygen; white cells, which fight infection; and platelets, which help blood clot. Most other words on the report describe the size, shape or number of those cells. This glossary explains each term in plain language.
How a report is laid out
Each line usually shows the test name, your result, the unit, and a reference range, which is the spread of results seen in most healthy people at that lab. A letter H or L, or a star, marks a result outside that range. Some labs print a short comment from the pathologist at the bottom.
Why the same test has different names
Labs use different machines and habits. White cell count may appear as WBC, TLC or total leucocyte count. Haemoglobin may be written as Hb or HGB. They mean the same thing.
What a glossary cannot do
Knowing what a word means does not tell you what your result means. A flagged value needs a doctor who can see the whole report, your symptoms and your older results.
Reference ranges differ between laboratories. A single result is always read alongside your symptoms and a repeat test.Red cell terms
What do the red cell lines mean?
- Haemoglobin (Hb, HGB)
- The protein in red cells that carries oxygen. Low haemoglobin is often why people feel tired or breathless.
- RBC count
- The number of red cells in a set amount of blood.
- PCV or HCT (haematocrit)
- The share of your blood made up of red cells. It usually moves with haemoglobin.
- MCV
- The average size of your red cells. Small cells often point to low iron or thalassaemia trait; large cells to low vitamin B12 or folate, alcohol or some medicines.
- MCH and MCHC
- How much haemoglobin each red cell carries. Low values mean paler red cells.
- RDW
- How much your red cells vary in size. A high RDW means a mix of sizes, often seen in early low iron.
- Reticulocytes
- Young red cells just released from the bone marrow. They show whether the marrow is making new cells.
Not sure whether this applies to you?
Ask an oncologistWhite cell terms
What do the white cell words mean?
The total white count comes first. The differential count below it splits that total into five types, each with its own job.
TLC, WBC or total leucocyte count
The total number of white cells. A high count often means infection or inflammation. A low count has many causes, from viral fevers to medicines.
Neutrophils
The main defence against bacteria. They rise in bacterial infections and fall with some medicines, viral illness or chemotherapy.
Also written as
- Polymorphs or polys
- ANC, the absolute neutrophil count
Lymphocytes
Cells that fight viruses and make antibodies. They rise in viral infections and are normally higher in young children than in adults.
Monocytes, eosinophils and basophils
Smaller groups. Monocytes help clear infection. Eosinophils often rise with allergies, asthma or worm infections. Basophils are rarely raised.
Absolute versus percentage
A percentage shows each type's share of the total. The absolute count is the actual number, and it is usually the more useful figure to read.
Platelets and the smear
What do the platelet and smear terms mean?
- Platelet count (PLT)
- The number of platelets, the small cells that plug leaks in blood vessels.
- MPV
- The average size of your platelets. Larger platelets are often younger ones.
- Platelet clumps
- Platelets stuck together in the tube, which can make the count look falsely low.
- Peripheral smear
- A drop of blood looked at under a microscope by a trained person, who comments on how the cells look.
- Blasts
- Very immature cells normally kept inside the bone marrow. Their presence in the blood needs prompt review by a haematologist.
- Atypical lymphocytes
- Lymphocytes that look different, most often during a viral infection.
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A way to read it
In what order should you read a blood report?
-
Check the name, date and lab
Make sure the report is yours and recent. Note the lab, because ranges differ between labs.
-
Look at the three headline counts
Haemoglobin, total white count and platelets. Note which, if any, are flagged high or low, and whether more than one is affected.
-
Look at the red cell size lines
If haemoglobin is low, MCV hints at the kind of cause: small cells, normal cells or large cells.
-
Read the differential in absolute numbers
See which white cell type is driving a high or low total.
-
Read the pathologist's comment last
Words such as blasts, immature cells or clumps change how everything above is read. Show that comment to your doctor first.
Commonly believed
What do people misread on a blood report?
"Every H or L on the report is a problem."
Flags mark results outside the lab's range, and some healthy people always sit just outside it. Small flags on the percentage lines, with normal absolute counts, often mean very little.
"A low haemoglobin always means we need iron tablets."
Low iron is common, but thalassaemia trait, vitamin B12 lack, kidney disease and long-term illness also lower haemoglobin. Iron does not help those, so the cause should be found before starting tablets.
"Atypical cells means cancer."
Atypical lymphocytes are most often seen during viral infections. Blasts are a different finding and do need prompt review. The exact words used matter, so read them carefully and show them to a doctor.
"The percentage lines are the most important."
A percentage can rise simply because another cell type fell. The absolute count shows the real number, and it is what most doctors look at first.
After you have read it
What should you do once you understand the words?
Take the report to a doctor, even if you now understand every line. A report is a set of clues. Putting them together with your symptoms and older results is the doctor's job, and it is where the real answer comes from.
Questions worth asking
Which result concerns you most, and why? Could this be a lab error or a passing change? Does anything need repeating, and when? What would make you want me to see a haematologist?
When a word on the report should make you move quickly
Blasts, several counts very low together, or a lab that phones you about a critical value all need a doctor within a day or two. Fever, bleeding or breathlessness with any abnormal report means the emergency department today.
Who this glossary does not suit
Children's reports use different normal ranges, and reports taken during chemotherapy follow their own expected pattern. In both cases, the treating team's reading matters more than any general guide.
Questions we are asked
Common questions about blood report terms
What is the difference between CBC and CBP?
None that matters to you. Complete blood count and complete blood picture are names for the same group of tests. Some labs include a peripheral smear in a complete blood picture and some do not. If you are not sure whether a smear was done, look for a written comment on cell shapes.
What does "reference range" mean?
It is the spread of results seen in most healthy people tested at that laboratory, with that machine. It is not a line between healthy and ill. Ranges differ between labs and between men, women and children, so compare your result with the range printed on your own report.
My report says "microcytic hypochromic". What is that?
It means your red cells are smaller and paler than usual. The most common causes are low iron and thalassaemia trait. Your doctor can tell them apart with iron studies and sometimes a haemoglobin electrophoresis test. Do not start iron on your own until the cause is known.
What does "shift to left" mean on a report?
It means younger neutrophils, called band forms, are showing up in the blood. This usually happens when the body is fighting a bacterial infection and releasing white cells quickly. Your doctor reads it together with your symptoms and the total white count.
What is ESR, and is it part of the blood count?
ESR measures how fast red cells settle in a tube. It rises with infection, inflammation, pregnancy and some other conditions. It is often printed with the blood count but is a separate test. A high ESR on its own does not point to any single illness.
What does "adequate on smear" mean for platelets?
It means the person looking at the smear under the microscope saw enough platelets, even if the machine count looked low. This often happens when platelets clump in the tube. Show the report to your doctor, who may simply repeat the count in a different tube.
Can I read my report using an app or online tool?
Apps can explain terms, but they cannot see your symptoms, your older reports or your medicines, and they often flag harmless results as alarming. Use them to learn the words, then take the report to a doctor. Do not start or stop any medicine because of what an app says.
Who can explain my report if my doctor is not available?
A general physician can explain most reports. If the report mentions blasts, unusual cells, or several abnormal counts, ask for a haematologist. CION's haematology team can review reports shared with them and tell you whether an in-person visit is needed.
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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Sources
- NHS — Blood tests
- National Cancer Institute — NCI Dictionary of Cancer Terms
- American Society of Hematology — Blood disorders: patient education
- Leukemia & Lymphoma Society — Leukemia & Lymphoma Society
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
Reading the Differential Count Line by LineThe white cell types in more depthWhat a Peripheral Smear Adds to Your Blood ReportWhat the pathologist's comment meansBlast Cells on a Blood ReportThe one smear word that needs prompt reviewAbnormal Blood Counts: What the Numbers MeanThe guide to every line on your report
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Still not sure what your report says?
Share it with us. CION's haematology team will read it and tell you whether anything needs a closer look. One helpline serves every CION centre.