Peripheral Blood Smear Test

The Peripheral Blood Smear (PBS) test examines the appearance, size, shape, and number of blood cells under a microscope. It helps diagnose various blood disorders, infections, and bone marrow diseases.

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Why is the Test Done?

✅ Evaluate unexplained anemia, jaundice, or fatigue
✅ Detect abnormal red blood cells (RBCs), white blood cells (WBCs), and platelets
✅ Diagnose infections, including malaria and blood parasites
✅ Assess blood cancers like leukemia or lymphoma
✅ Monitor bone marrow disorders and chemotherapy response

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What Does the Test Check?

🔴 Red Blood Cells (RBCs) – Oxygen-carrying cells

✅ Normal RBCs – Round, biconcave, and uniform in size
🔹 Anisocytosis – Variation in RBC size (seen in anemia)
🔹 Poikilocytosis – Abnormal RBC shapes (sickle cells, schistocytes, target cells)
🔹 Hypochromia – Pale RBCs (seen in iron deficiency anemia)
🔹 Macrocytosis – Large RBCs (B12 or folate deficiency)

⚪ White Blood Cells (WBCs) – Fight infection

✅ Normal WBCs – Different types appear in normal proportions
🔹 High WBC count – May indicate infection, inflammation, or leukemia
🔹 Low WBC count – Suggests bone marrow suppression, viral infections, or immune disorders
🔹 Abnormal WBCs – Blasts (immature WBCs) suggest leukemia

🟡 Platelets – Help in blood clotting

✅ Normal platelets – Small, scattered in the smear
🔹 Low platelets (thrombocytopenia) – Seen in immune disorders, infections, or leukemia
🔹 High platelets (thrombocytosis) – Can indicate bone marrow disorders

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Common Conditions Diagnosed with PBS

🔹 Anemia Types

• Iron Deficiency Anemia – Small, pale RBCs (microcytic, hypochromic)
• Megaloblastic Anemia – Large RBCs (macrocytic) due to B12/Folate deficiency
• Sickle Cell Anemia – Sickle-shaped RBCs
• Hemolytic Anemia – Fragmented RBCs (schistocytes)

🔹 Infections & Parasitic Diseases

• Malaria – Parasites inside RBCs
• Babesiosis – Tick-borne blood infection
• Sepsis – Abnormal WBCs with toxic granulation

🔹 Blood Cancers & Bone Marrow Disorders

• Leukemia – Immature WBCs (blasts)
• Multiple Myeloma – Rouleaux formation (stacked RBCs)
• Myelodysplastic Syndrome (MDS) – Abnormal blood cell development

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Next Steps After a Peripheral Blood Smear

🔬 Additional Tests May Include:
✔ Complete Blood Count (CBC) – Confirms abnormal cell counts
✔ Bone Marrow Biopsy – Evaluates blood cell production
✔ Iron Studies, B12/Folate Levels – Checks for nutritional deficiencies
✔ Genetic Testing – Diagnoses inherited blood disorders

📌 Treatment depends on the underlying cause, ranging from supplements (iron, B12) to chemotherapy for blood cancers.