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A Complete Blood Count (CBC) measures your red cells, white cells, platelets, hemoglobin, and more. This guide explains what each value means, standard adult reference ranges, and when to talk to your doctor.
This page is general health education only — it is NOT a medical diagnosis or medical advice. Reference ranges for CBC values vary between laboratories, analyzers, age groups, sex, and clinical context. A result outside the printed range on your lab report does not automatically mean something is wrong. If your results are abnormal, you have symptoms, or you are concerned — consult a licensed physician. In a medical emergency, call your local emergency number immediately (911 / 112 / 101 or equivalent). WizeHealth and WizeLife provide health information tools, not regulated medical advice.
A CBC (Complete Blood Count) is a panel of measurements taken from a blood sample that gives your doctor a broad picture of your overall health. It reports on three main cell lines: red blood cells (which carry oxygen), white blood cells (immune defense), and platelets (clotting). Key values include Hemoglobin (Hgb) — the oxygen-carrying protein in red cells; Hematocrit (Hct) — the percentage of blood that is red cells; RBC count; WBC count; Platelet count; and MCV (Mean Corpuscular Volume — average size of red cells). To read your CBC report, compare each value to the reference range printed by your specific laboratory (ranges vary). Values outside that range are flagged as high (H) or low (L). A flagged value is a prompt for your doctor to investigate further — it is not a diagnosis by itself. The sections below explain each component and what broadly high or low values can generally indicate.
Ranges below are typical adult approximations. Your lab report's own reference column is the authoritative number for your result. Ranges differ by sex, age, pregnancy, altitude, and lab calibration.
| Marker | Typical Adult Range | Unit | What it measures |
|---|---|---|---|
| Hemoglobin (Hgb) | Men: 13.5–17.5 Women: 12.0–15.5 |
g/dL | Oxygen-carrying protein inside red cells. The main indicator for anemia or polycythemia. |
| Hematocrit (Hct) | Men: 41–53% Women: 36–46% |
% | Fraction of whole blood that is red blood cells. Mirrors hemoglobin trends. |
| RBC Count | Men: 4.5–5.9 Women: 4.0–5.2 |
10⁶/µL | Number of red blood cells. Used alongside Hgb and MCV to classify anemia type. |
| WBC Count | 4.5–11.0 | 10³/µL | Total white blood cells. Elevated in infection/inflammation; low in some viral illnesses or bone marrow conditions. |
| Platelets (PLT) | 150–400 | 10³/µL | Clotting cells. Low platelets (thrombocytopenia) can cause bleeding risk; high (thrombocytosis) can occasionally increase clot risk. |
| MCV | 80–100 | fL | Average red cell size. Low = microcytic (often iron deficiency); High = macrocytic (often B12/folate deficiency or liver disease). |
| MCH | 27–33 | pg | Average hemoglobin per red cell. Typically follows MCV trends. |
| MCHC | 32–36 | g/dL | Concentration of hemoglobin in red cells. Low = hypochromic (often iron deficiency). |
These are general educational associations only — they are not a diagnosis. A physician uses your full clinical picture.
May broadly suggest anemia. Common causes include iron deficiency, B12/folate deficiency, chronic disease, blood loss, or hemolysis. Requires investigation to find the cause.
May suggest dehydration, smoking, living at high altitude, or — less commonly — a condition called polycythemia vera. Often benign, but warrants review.
Seen with many viral infections, certain medications (chemotherapy, some antibiotics), autoimmune conditions, or nutritional deficiencies. Rarely, may indicate a bone marrow issue.
Very common with bacterial infections, inflammation, physical stress, or steroid use. A single elevated count in the context of illness is usually expected. Persistent, very high counts need further workup.
Called thrombocytopenia. Causes range from viral illness to medication effects to immune conditions. Very low counts (<50,000) can increase bleeding risk — urgent medical attention needed.
Reactive thrombocytosis is common after surgery, infection, or iron deficiency and is usually temporary. Essential thrombocythemia is a rarer primary condition. Usually monitored by a physician.
Most commonly points to iron-deficiency anemia or thalassemia trait. Confirmed with ferritin and iron studies.
Most commonly associated with B12 or folate deficiency, liver disease, hypothyroidism, or alcohol use. A B12/folate blood test typically follows.
This page provides general health education only — it is NOT a medical diagnosis or medical advice of any kind. Reference ranges for CBC values vary between laboratories, analyzers, patient age, sex, and clinical context — always compare your result to the reference range printed on YOUR own lab report, not to the approximate values on this page. A value outside the reference range does not automatically mean something is wrong; equally, a value within range does not rule out a medical condition. If your results are abnormal, you have any health symptoms, or you are in any way concerned, consult a licensed physician promptly. In a medical emergency — chest pain, difficulty breathing, loss of consciousness — call your local emergency number immediately (911, 112, 101, or equivalent). WizeHealth and WizeLife are health information tools, not regulated medical providers. Nothing on this page constitutes a doctor-patient relationship.
WizeHealth lets you log and track your CBC results over time, flag trends, and get plain-language context — so you arrive at your doctor's appointment informed, not anxious. Free to start, no credit card.
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