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What can a CBC blood test tell you?

Author

Charlotte Adams

Published Feb 25, 2026

What can a CBC blood test tell you?

A complete blood count (CBC) is a blood test used to evaluate your overall health and detect a wide range of disorders, including anemia, infection and leukemia. A complete blood count test measures several components and features of your blood, including: Red blood cells, which carry oxygen.

Similarly, what diseases can be diagnosed with a CBC?

The CBC can evaluate your overall health and detect a variety of diseases and conditions, such as infections, anemia and leukemia.

Some examples include:

  • Anemia of various etiologies.
  • Autoimmune disorders.
  • Bone marrow disorders.
  • Dehydration.
  • Infections.
  • Inflammation.
  • Hemoglobin abnormalities.
  • Leukemia.

One may also ask, what does abnormal CBC mean? Abnormal red blood cell, hemoglobin, or hematocrit levels may indicate anemia, iron deficiency, or heart disease. Low white cell count may indicate an autoimmune disorder, bone marrow disorder, or cancer. High white cell count may indicate an infection or reaction to medication.

Furthermore, what is tested in a full blood count?

Full blood count (FBC)

This is a test to check the types and numbers of cells in your blood, including red blood cells, white blood cells and platelets. This can help give an indication of your general health, as well as provide important clues about certain health problems you may have.

Why does a doctor order a CBC blood test?

Your doctor may order a CBC as part of a routine checkup or to: Check for anemia, a condition that causes you to have fewer red blood cells than usual. Find out if you have another health issue or to explain symptoms like weakness, fever, bruising, or feeling tired. Keep an eye on a blood condition.

What infections show up in blood tests?

Blood tests aren't always accurate right after contracting an infection.

The following STDs can be diagnosed with blood tests:

  • chlamydia.
  • gonorrhea.
  • herpes.
  • HIV.
  • syphilis.

What cancers are detected by blood tests?

Prostate-specific antigen test
MarkerAssociated cancersTest
Beta-2-microglobulin (B2M)Multiple myeloma, chronic lymphocytic leukemia, and some lymphomasBlood, urine, spinal fluid
Beta-human chorionic gonadotropin (Beta-hCG)Choriocarcinoma and germ cell tumorsUrine or blood
CA15-3/CA27.29Breast cancerBlood

Can CBC detect bacterial infection?

A CBC test usually includes: White blood cell (WBC, leukocyte) count. White blood cells protect the body against infection. If an infection develops, white blood cells attack and destroy the bacteria, virus, or other organism causing it.

How can you tell the difference between a viral and bacterial infection on a CBC?

For example, if you have a bacterial infection, you will have an increase of neutrophils and a decrease in lymphocytes. Conversely, if you have a viral infection, you will have a decrease in neutrophils and an increase in lymphocytes.

Will a CBC show kidney problems?

With kidney disease, the amount of erythropoietin produced may be decreased, causing a decrease in red blood cell production. This shows up in the CBC as anemia. The white blood cell numbers may be increased if the underlying cause of the kidney disease is due to an infection or inflammation.

Can a CBC detect liver problems?

This shows how much your liver has been damaged, and whether you need a liver transplant. Other blood tests your doctor might order include: A complete blood count (CBC). This test checks your red and white blood cells to get a picture of your overall health.

Does CBC show autoimmune disease?

A complete blood count will also assess whether red blood cell counts are low. Low red blood cell counts can indicate anemia caused by bleeding, medications, “chronic disease,” autoimmune hemolytic anemia (breakdown of RBCs due to auto-antibodies), or a vitamin deficiency.

Can routine blood work detect STDs?

The Routine Screen is a comprehensive test for the 6 most common STIs detectable through blood and urine analysis (Chlamydia, Gonorrhoea, HIV, Syphilis, Hepatitis B and Hepatitis C) even when they are asymptomatic and is recommended as part of your routine health management, if you are commencing a new sexual

What does routine blood work check for?

Complete Blood Count. The CBC is one of the most common blood tests. It's often done as part of a routine checkup. The CBC can help detect blood diseases and disorders, such as anemia, infections, clotting problems, blood cancers, and immune system disorders.

What can Blood tests reveal?

Blood tests can be used for many different things, including to check cholesterol and blood glucose levels. These help monitor your risk of heart and circulatory diseases and diabetes, or how your condition is being managed. Tests for different chemicals and proteins can indicate how your liver or kidneys are working.

Does dehydration affect CBC results?

A complete blood count (CBC) test evaluates the overall health of the blood cells circulating in the body. Hematocrit is one component of the CBC test that can be skewed as a result of dehydration.

Can CBC detect heart problems?

Another part of a CBC test is the mean corpuscular volume, which is a measure of the average size of your red blood cells. Specific blood tests can be performed to detect problems with your heart, lungs, or blood vessels. Cardiac enzyme tests measure the cardiac enzyme levels in the blood.

How long do CBC results take?

Complete blood count (CBC).

This test measures the presence of 10 cell types in the white blood cells, red blood cells, and platelets. Examples of these results include hematocrit, hemoglobin, red blood cell count, and white blood cell count. CBC results are usually available to your doctor within 24 hours.

Why would you be referred to a hematologist?

If your primary care physician has recommended that you see a hematologist, it may be because you are at risk for a condition involving your red or white blood cells, platelets, blood vessels, bone marrow, lymph nodes, or spleen. Some of these conditions are: hemophilia, a disease that prevents your blood from clotting.

Do blood tests show blood type?

The results of blood typing will determine if a person is type A, B, AB, or O and if he or she is Rh negative or positive. The results will tell the healthcare provider what blood or blood components will be safe for the person to receive.

What happen if white blood cells are high?

A high white blood cell count usually indicates: An increased production of white blood cells to fight an infection. A reaction to a drug that increases white blood cell production. A disease of bone marrow, causing abnormally high production of white blood cells.

What is the most common hematology test?

One of the most common hematology tests is the complete blood count, or CBC. This test is often conducted during a routine exam and can detect anemia, clotting problems, blood cancers, immune system disorders and infections.

Do all cancers show up in blood tests?

With the exception of blood cancers, blood tests generally can't absolutely tell whether you have cancer or some other noncancerous condition, but they can give your doctor clues about what's going on inside your body.

What WBC count indicates leukemia?

At the time of diagnosis, patients can have very, very high white blood cell counts. Typically a healthy person has a white blood cell count of about 4,000-11,000. Patients with acute or even chronic leukemia may come in with a white blood cell count up into the 100,000-400,000 range.

Does lymphoma show up in blood work?

The doctor also might order blood tests to look for signs of infection or other problems. Blood tests aren't used to diagnose lymphoma, though. If the doctor suspects that lymphoma might be causing your symptoms, he or she might recommend a biopsy of a swollen lymph node or other affected area.

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