CBC 16 values Updated Apr 29, 2026

Complete Blood Count (CBC)

A Complete Blood Count (CBC) is a blood test panel that measures the cells in your blood — red blood cells, white blood cells, hemoglobin, platelets, and several derived values that describe how those cells look and behave. CBC is one of the most commonly ordered panels and appears on most routine lab reports. Each CBC value describes a different aspect of the blood — oxygen-carrying capacity, immune-system cell counts, clotting cells, and red cell shape and size — and the panel is usually read as a whole rather than one value at a time. BloodSight reads your CBC from PDF or portal exports and charts every value across visits.

Read the CBC guide

What a Complete Blood Count Tells You

A Complete Blood Count (CBC) is one of the most commonly ordered blood test panels. It groups the major cell-population measurements — red blood cells, white blood cells, and platelets — together with several derived indices that describe how those cells look. Each CBC value describes a different aspect of the blood, and the panel is usually interpreted as a pattern rather than one value at a time. CBC values are influenced by hydration, recent illness, medications, nutritional status, age, and many other factors, which is one reason CBC results are most informative when tracked across multiple panels rather than read in isolation.

Why Most Routine Bloodwork Includes a CBC

A CBC is commonly ordered as part of routine checkups, before procedures, when an existing condition is being followed, or whenever bloodwork is needed for a baseline. The panel covers oxygen-carrying capacity, immune-system cell counts, and clotting cell counts in a single draw, which is why it appears on most routine lab orders. CBC results are often most informative when read alongside prior panels rather than as a one-off reading.

Components of a Complete Blood Count

The CBC panel groups its values by blood cell type. Red blood cell measurements include hemoglobin (Hgb — the protein that carries oxygen), hematocrit (Hct — the proportion of blood made up of red cells), red blood cell count (RBC — the number of red cells per volume), and several red cell indices: mean corpuscular volume (MCV — average red cell size), mean corpuscular hemoglobin (MCH — average hemoglobin per red cell), mean corpuscular hemoglobin concentration (MCHC — hemoglobin density), and red cell distribution width (RDW — variation in red cell size). White blood cell measurements include the total white blood cell count (WBC) and the differential — neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Platelet measurements include platelet count (PLT) and mean platelet volume (MPV — average platelet size). Together these values describe oxygen-carrying capacity, immune-system cell counts, clotting cells, and red cell shape and size.

How to Read a CBC by Cell Type

A Complete Blood Count groups its 10–15 values across three cell-type sections. Reading by section rather than top-to-bottom makes the report much more interpretable — each section answers a different question about your blood, and the values within a section move together.

  1. 1

    Red blood cell numbers (Hgb, Hct, RBC)

    Start with hemoglobin (Hgb) — the oxygen-carrying capacity of the blood. Hematocrit (Hct) is the proportion of blood made up of red cells; it usually moves with Hgb. RBC counts the number of red cells. These three together describe whether enough oxygen-carrying capacity is present in the sample.

  2. 2

    Red cell indices (MCV, MCH, MCHC, RDW)

    MCV measures average red cell size; MCH measures hemoglobin per red cell; MCHC describes hemoglobin density. RDW captures variation in red cell size. The indices describe what the red cells look like — small, large, hemoglobin-poor, hemoglobin-rich, uniform, or varied — which is often more informative than the raw RBC count.

  3. 3

    White blood cell count and the differential

    WBC counts total white blood cells. The differential breaks the WBC into neutrophils, lymphocytes, monocytes, eosinophils, and basophils — each cell type responds to different processes. The pattern across the differential is what most providers read; the total WBC alone says less.

  4. 4

    Platelets (PLT, MPV)

    Platelet count (PLT) is the number of clotting cells. Mean platelet volume (MPV) measures average platelet size — newly produced platelets tend to be larger. Platelet values are read together with the rest of the CBC to describe overall blood-cell production.

  5. 5

    Look for patterns across sections

    A CBC is most informative read as a pattern. Hgb and Hct moving together; MCV and MCH telling the same story; WBC differential coherent with itself. Single mildly out-of-range values within an otherwise consistent CBC usually mean less than coherent shifts across multiple values.

Read the full CBC guide

Adult CBC Reference Ranges

Each value below uses the typical adult reference range printed on most CBC reports. Hematology values vary slightly by laboratory, instrument, and altitude — anemia clinics sometimes use tighter cutoffs than routine screening labs. BloodSight reads the exact range printed on your uploaded report and shows it next to every value.

Test Normal range (Adult) Unit Flagged when
Hemoglobin Hgb 13.5–17.5 g/dL < 13.5 or > 17.5
White Blood Cell Count WBC 4–11 x10^3/µL < 4 or > 11
Red Blood Cell Count RBC 4.5–5.9 million cells/µL < 4.5 or > 5.9
Hematocrit Hct 41–53 % < 41 or > 53
Platelet Count PLT 150–450 x10^3/µL < 150 or > 450
Mean Corpuscular Volume MCV 80–100 fL < 80 or > 100
Mean Corpuscular Hemoglobin MCH 27–33.2 pg < 27 or > 33.2
Mean Corpuscular Hemoglobin Concentration MCHC 32–36 g/dL < 32 or > 36
Red Cell Distribution Width RDW 11.5–14.5 % < 11.5 or > 14.5
Mean Platelet Volume MPV 7.5–11.5 fL < 7.5 or > 11.5
Neutrophils 40–70 % < 40 or > 70
Lymphocytes 20–40 % < 20 or > 40
Monocytes 2–8 % < 2 or > 8
Eosinophils 0–5 % < 0 or > 5
Basophils 0–1 % < 0 or > 1
Reticulocytes 0.5–2.5 % < 0.5 or > 2.5

Common Reasons CBC Values Shift

Hydration, recent infection, iron status, and bleeding history move CBC values more than most people expect — and the same draw can read differently a week later. The factors below are the contributors most often discussed for each CBC component.

Common factors for high values

Common factors for low values

All CBC Values

Hemoglobin

Hgb

Hemoglobin (Hgb) is the oxygen-carrying protein inside red blood cells. On a lab report or blood test, Hgb helps show how much oxygen-carrying material is present in the blood and is usually reported as part of a CBC. Hemoglobin reference range values vary by age, sex, altitude, and lab method, so the Hemoglobin test result is best read with related markers such as hematocrit (Hct), red blood cell count (RBC), and mean corpuscular volume (MCV).

Adult Male g/dL
13.5
17.5

White Blood Cell Count

WBC

White Blood Cell Count (WBC) is a lab value that measures how many white blood cells are present in a blood sample. On a lab report, WBC helps describe immune-cell concentration in the blood and is commonly included in a complete blood count (CBC).

Adult Male x10^3/µL
4
11

Red Blood Cell Count

RBC

Red Blood Cell Count (RBC) is a measure of how many red blood cells are present in a given volume of blood. RBC on a blood test helps describe blood composition and is commonly reported on a CBC, where it is read alongside related markers such as hematocrit (Hct) and mean corpuscular volume (MCV).

Adult Male million cells/µL
4.5
5.9

Hematocrit

Hct

Hematocrit (Hct) is the percentage of blood volume made up of red blood cells. On a Hematocrit on a blood test, Hct helps describe how concentrated the red cell portion is compared with plasma. It is commonly included in a CBC and is read with RBC and MCV for a fuller picture of blood composition.

Adult Male %
41
53

Platelet Count

PLT

Platelet Count (PLT) is a lab value that measures the number of platelets in blood. PLT appears on a blood test, especially a complete blood count (CBC), and helps describe the cell makeup of the sample. A Platelet Count lab report result is often reviewed with other CBC markers to understand overall blood composition.

Adult Male x10^3/µL
150
450

Mean Corpuscular Volume

MCV

Mean Corpuscular Volume (MCV) is the average size of red blood cells measured in a blood sample. On a lab report or blood test, MCV helps describe red cell size as part of a CBC and is often read with other red blood cell markers. It is a numerical summary, not a stand-alone conclusion, and is used to compare a person’s result with the Mean Corpuscular Volume normal range.

Adult Male fL
80
100

Mean Corpuscular Hemoglobin

MCH

Mean Corpuscular Hemoglobin (MCH) is the average amount of hemoglobin in each red blood cell, reported as part of the CBC and often abbreviated as MCH. On a blood test or lab report, it helps describe red blood cell composition alongside markers such as MCV, RBC, and hematocrit (Hct).

Adult Male pg
27
33.2

Mean Corpuscular Hemoglobin Concentration

MCHC

Mean Corpuscular Hemoglobin Concentration (MCHC) is a CBC measurement that shows how concentrated hemoglobin is inside red blood cells. MCHC on a blood test helps describe red cell composition alongside markers like MCV, MCH, hematocrit (Hct), and red blood cell count (RBC).

Adult Male g/dL
32
36

Red Cell Distribution Width

RDW

Red Cell Distribution Width (RDW) is a CBC value that shows how much red blood cell size varies from cell to cell. On a Red Cell Distribution Width blood test, the result helps describe whether the red cell population is fairly uniform or more mixed in size. RDW is often read together with MCV, RBC, Hct, and hemoglobin for a fuller view of red cell measurements.

Adult Male %
11.5
14.5

Mean Platelet Volume

MPV

Mean Platelet Volume (MPV) is a CBC lab value that shows the average size of platelets in the blood. On a lab report, MPV helps describe platelet production and turnover, and it is often read alongside the platelet count and other CBC markers. A high MPV or low MPV can shift the overall pattern of the blood test without pointing to one single explanation.

Adult Male fL
7.5
11.5

Neutrophils

Neutrophils are a type of white blood cell measured on a CBC. A Neutrophils test result usually appears as a percentage or absolute count and helps describe the balance of white blood cells on a blood test. The Neutrophils normal range can vary by lab method and reporting format.

Adult Male %
40
70

Lymphocytes

Lymphocytes is a white blood cell measure that shows how much of the total white blood cell count is made up of Lymphocytes. On a blood test, it is usually reported as a percentage in the CBC and helps describe the balance of white blood cell types in the blood.

Adult Male %
20
40

Monocytes

Monocytes is a white blood cell measurement reported on a complete blood count (CBC). It shows the share or number of Monocytes, a type of white blood cell, in a blood sample. On a lab report, Monocytes helps describe the overall white blood cell pattern and is often read with other CBC values.

Adult Male %
2
8

Eosinophils

Eosinophils is a white blood cell type measured on a blood test, usually as part of a CBC. Eosinophils on a lab report helps describe the makeup of the white blood cell portion of blood and how that mix compares with other CBC markers.

Adult Male %
0
5

Basophils

Basophils is a white blood cell subtype that appears on a CBC and is reported as part of the blood’s cell differential. On a Basophils on a blood test, it shows how much of the white cell mix is made up of basophils, which helps describe the overall makeup of the blood report.

Adult Male %
0
1

Reticulocytes

Reticulocytes are immature red blood cells released from the bone marrow into the bloodstream. On a lab report or blood test, Reticulocytes help show how actively the body is making new red blood cells and are often reviewed with CBC results.

Adult Male %
0.5
2.5

Compare values in this panel

How values in this panel relate to each other and what their differences mean.

Preparing for a CBC Draw

Most CBC orders do not require fasting. Typical preparation is straightforward: bring the lab requisition or portal order details to the draw. If a CBC is ordered alongside other blood tests (such as a lipid panel or fasting glucose), the fasting instructions for those tests apply. The CBC sample is usually a single venous blood draw and processing is fast — many labs return CBC results within hours. Once results are released, you can upload the PDF or portal export to BloodSight.

Common CBC Questions

What does a CBC measure?
A Complete Blood Count measures the cells in the blood — red blood cells, white blood cells, hemoglobin, platelets, and several derived values like MCV, MCH, MCHC, and RDW that describe red cell shape and size. Many CBC panels also include a differential — neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Each value describes a different aspect of the blood, and CBC results are usually read as a whole rather than one value at a time.
What are CBC reference ranges?
CBC reference ranges describe the values that are statistically common in the general adult population. They vary slightly by laboratory, age, sex, and altitude. Typical adult ranges include hemoglobin 12.0–17.5 g/dL, hematocrit 36–50%, RBC 4.0–6.0 ×10⁶/µL, WBC 4.0–11.0 ×10³/µL, and platelets 150–450 ×10³/µL. BloodSight shows the laboratory reference range next to each CBC value and flags numbers that fall outside it.
How do I read CBC results?
A common reading order is hemoglobin and hematocrit first (oxygen-carrying capacity), then RBC indices (MCV, MCH, MCHC, RDW — the size and shape of red cells), then white blood cells with the differential (neutrophils, lymphocytes, monocytes, eosinophils, basophils), then platelets. Each section answers a different question about the blood, and CBC values are usually most informative when read as a pattern rather than one at a time.
What do CBC results mean?
CBC results describe blood composition at the moment of the draw. Each value answers a different question — oxygen-carrying capacity, immune-system cell counts, clotting cells, red cell shape and size. The combined pattern of CBC values usually carries more interpretive weight than any single number, especially across multiple panels tracked over time.
What does a high CBC result mean?
There is no single "high CBC" — different values being high describe different things. High white blood cells often describe an immune response; high hemoglobin can describe hydration status or other factors; high platelets describe a different mechanism altogether. Each component biomarker page in BloodSight describes what is commonly associated with high or low results for that specific value.
What causes abnormal CBC values?
CBC values are influenced by hydration, recent illness, medications, nutritional status, genetics, age, and many other factors. Each component biomarker page describes the most common contributors for that specific value.
How long do CBC results take?
CBC is one of the fastest blood tests — most laboratories return results within hours, and many labs make CBC available the same day. Patient portals usually post CBC values first, with the full PDF following shortly after.
Do I need to fast for a CBC?
Most CBC orders do not require fasting. If a CBC is ordered alongside other tests (such as a lipid panel or fasting glucose), the fasting instructions for those tests apply.
How often should a CBC be tested?
Frequency depends on why the test is being ordered. Routine CBCs as part of an annual visit are typically yearly; CBCs ordered to track a specific value may be repeated more often. BloodSight charts every CBC you upload side by side so you can see how each value moves over time.
Why can CBC results vary between labs?
CBC results can vary between labs because reference ranges, instruments, and reporting methods are not always identical. Even when the same blood test is ordered, one lab might report slightly different numeric ranges than another. BloodSight reads each lab's printed reference range and applies it to the values on that specific report, so the flag matches the laboratory that ran the sample.

Panels Frequently Ordered Alongside a CBC

A CBC is rarely the only panel on a routine draw. The panels below most often share the same requisition — together they cover red and white blood cells, the metabolic baseline, iron status, and inflammatory context.

CMP

Comprehensive Metabolic Panel (CMP)
FE

Iron Studies
INF

Inflammation Markers

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.