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Blood Film Comment/Peripheral Blood Film medical test

Learn about Blood Film Comment/Peripheral Blood Film medical tests, including what the tests are used for, why a doctor may order a test, how a test will feel, and what the results may mean.


What is Blood Film Comment/Peripheral Blood Film?

 Blood film comment is a blood test used to look for abnormalities in blood cells. The three main blood cells that the test focuses on are:

  • red cells, which carry oxygen throughout your body
  • white cells, which help your body fight infections and other inflammatory diseases
  • platelets, which are important for blood clotting

The test provides information on the number and shape of these cells, which can help doctors diagnose certain blood disorders or other medical conditions.

What the Blood Film Comment/Peripheral Blood Film test used for?

To evaluate your red blood cells (RBCs), white blood cells (WBCs), and platelets, to distinguish between the different types of WBCs, and to determine their relative percentages in the blood; to help detect, diagnose, and/or monitor a range of deficiencies, diseases, and disorders involving blood cell production, function, and lifespan. The blood smear test is often done to diagnose conditions that are causing:

  • unexplained jaundice
  • unexplained anemia (low levels of normal red blood cells)
  • abnormal bruising
  • persistent flu-like symptoms
  • sudden weight loss
  • unexpected or severe infection
  • skin rashes or cuts
  • bone pain

How is the procedure performed?

A blood sample drawn from a vein in your arm or by pricking a finger, ear or, in the case of an infant, a heel. You may want to wear a shirt with sleeves that can easily be rolled up to make it easier to collect the blood sample. This usually takes less than five minutes.

What will be the results interprets?

The results of a blood smear typically include a description of the appearance of the red blood cells, white blood cells, and platelets as well as any abnormalities that may be seen on the slide.

Red Blood Cells (RBCs)
Normal Result
Size Uniform in size (7-8 µm in diameter)
Nucleus Absence
Shape Appear pink to red in color with a pale center
Colour Round and flattened like a donut with a depression in the middle instead of a hole (biconcave)
Abnormal Result
Anisocytosis Variable sizes of red blood cells may indicate anemia
Poikilocytosis Various shapes of red cells
Anisopoikilocytosis Variability in both RBC size and shape