Haematology Team431
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White Blood Cells
Abdulrahman Alkadhaib & Alaa Alanazi
Mohammed
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Haematology Team431
Red color = Important information
Blue color = Additional notes
Objectives:
• Identify the types of white blood cells in a normal differential count.
• Know the various leukocyte functions.
• Recognize the abnormalities of the white blood cells and what they imply.
• Interpret the results and correlate the changes with the patient’s clinical state
(presentation, symptoms and signs, etc….).
Pluripotent stem cells can differentiate into:
Mixed Myeloid Progenitor: produces red cells, platelets, monocytes, neutrophils, basophils
and eosinophils.
Lymphoid Progenitor: produces T and B lymphocytes.
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Haematology Team431
This picture shows the different factors that controls Haematopoiesis (formation of blood cells)
such as colony stimulating factors and interleukins.
Granulopoiesis
Stages of Granulopoiesis (the formation of granulocytes within the bone marrow).
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This normal peripheral
smear demonstrates:
Segmented neutrophil
and
Band neutrophil
This normal peripheral
smear demonstrates:
Segmented neutrophil
and
Lymphocyte
Lymphocytes are
characterized by a large
nucleus
This normal peripheral
smear demonstrates:
Monocyte
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Haematology Team431
This normal peripheral smear
demonstrates:
Eosinophil
and
Lymphocyte.
Normal white blood cells (WBCs)
Band
Neutrophil Eosinophil
Lymphocyte
Segmented
Neutrophil
Monocyte
Basophil
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Haematology Team431
Functions of White Blood Cells:
1- Phagocytosis
The neutrophils and the monocytes engulf foreign particles and bacteria
through their phagocytic action, thereby destroying their action.
2- Body defense
WBC manufactures anti-bodies and immune bodies to increase the power
of resistance against any infection.
3- Formation of fibroblast
Lymphocytes may be converted to fibroblasts in the area of inflammation
and help the process of tissue repair and regeneration.
4- Secretion of heparin
The basophile leucocytes are supposed to secrete heparin (a substance of
liver), which prevent, intravascular clotting.
5- Anti histamine functions
The eosinophils are believed to defend the body against allergic
conditions in which histamine like bodies are produced in excess.
6- Production of thromboplastic substances
Due to the production of such substances, the process of coagulation and
the deposit of clot are facilitated.
7- Destroy Cancer Cells
In addition to recognizing and killing virally infected cells, T lymphocytes
can also target and kill tumor cells or abnormal cells that may represent
the early beginnings of a tumor.
8- Manufacture of trephones:
Leucocytes manufacture certain substances called trephones from plasma
protein, which exert great influence on the nutrition, growth and repair of
tissues.
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White Blood Cells Abnormalities:
Benign
1- Quantitative abnormalities (abnormality in the number of blood cells)
- Leukocytosis (an increase in the number of white blood cells in the blood)
- Leukopenia (a decrease in the number of white blood cells blood)
2- Qualitative Abnormalities (abnormality in the function of blood cells)
3- Leukemia
Laboratory Evaluation of Leukemia:
Morphology
Cytochemistry
Genetic analyses
Chromosomal molecular Immunology
Acute
- Myeloid Leukemia
- Lymphoid Leukemia
Chronic
- Myeloproliferative Disorders
- Lymphoid Leukemia
Myelodysplastic Syndromes
Lymphoma
Immunosecretory Disorders (a group of disorders characterized by monoclonal
proliferation of immunoglobulin-producing cells that resemble lymphocytes or plasma cells)
Myeloma (a cancer of plasma cells)
Other Plasma Cell Disorders
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Neutrophilia
(An increase in number of neutrophils in the blood)
Causes:
Acute infections Bacterial, viral, fungal, mycobacterial and
rickettsial.
Physical stimuli Pregnancy (the main cause of Neutrophilia) ,
trauma, electric shock, Anoxia.
Corticosteroids
Drugs and chemicals adrenaline, lead
mercury poisoning, lithium
Acute haemorrhage, acute haemolysis,
Hematological causes transfusion reactions, post-splenectomy,
Leukemia and myeloproliferative disorders.
Malignant disease Carcinoma, especially of gastro-intestinal tract, liver
or bone marrow
Miscellaneous conditions Certain dermatoses, hepatic necrosis, chronic
idiopathic leucocytosis
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Haematology Team431
Lymphocytosis
(An increase in the number of lymphocytes in the blood)
Non-Malignant causes:
Infectious mononucleosis
Virus infections
Infectious lymphocytosis
(main cause)
Cytomegalovirus infection
Occasionally mumps, varicella, hepatitis, rubella, influenza
Pertussis
Bacterial Infections
Occasionally cat-scratch fever, tuberculosis, syphilis, brucellosis
Protozoal infections Toxoplasmosis
Occasionally malaria
Other rare causes Hyperthyroidism, congenital adrenal hyperplasia
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Haematology Team431
Monocytosis
(An increase in the number of monocytes in the blood)
Causes:
Chronic bacterial infections Tuberculosis, subacute bacterial
endocarditis, brucellosis
Other Specific Infections Malaria, Kala-azar, trypanosomiasis,
typhus, Rocky Mountain spotted fever
Malignant diseases Hodgkin’s disease, carcinoma
Acute myeloid leukemia
Leukemia Chronic monocytic leukemia
Familial benign and severe neutropenia
Neutropenias Cyclical neutropenia
Drug-induced Agranulocytosis
Cirrhosis, systemic lupus erythematosus,
Miscellaneous rheumatoid arthritis
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Haematology Team431
Eosinophilia
(Increase in number of eosinophil)
Causes:
Allergic reactions Asthma, hay fever, urticaria, angioneurotic edema
Parasitic Tissue parasites – trichinosis, filariasis,
Infestation Visceral larva migrans, etc...
Intestinal parasites – Ascaris, Taenia, etc. (less regularly)
Skin disorders Pemphigus, pemphigoid, eczema, psoriasis, (dermatitis herpetiformis)
Drug Especially iodides, penicillin, allopurinol, gold salts, tartrazine
hypersensitivity Loffler’s pulmonary syndrome and Loffler’s endomyocarditis
reactions
Tropical eosinophilia (probably filarial)
Especially Hodgkin’s disease,
Malignant diseases carcinoma of ovary, lung stomach,
angioimmunoblastic lymphadenopathy.
Following Hypereosinophilic syndromes
irradiation or Eosinophilic leukemia
splenectomy
Polyarteritis nodosa, ulcerative colitis, sarcoidosis, scarlet fever,
Miscellaneous pernicious anaemia, chronic active hepatitis, eosinophilic granuloma,
Conditions
familial eosinophilia
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Leukemoid Reaction or Leucoerythroblastic Anaemia
Leukemoid Reaction: an increase in white blood cell count (Leukocytosis)
caused by an infection or other disease. (It’s not a sign of cancer)
Leucoerythroblastic Anaemia: appearance of immature myeloid and nucleated
erythrocytes in the blood caused by infiltration of the bone marrow by foreign
or abnormal tissue.
Causes:
a. Pneumonia, septicaemia, meningococcal meningitis
Severe infections
especially in children b. Infectious mononucleosis, pertussis
Intoxications Eclampsia, severe burns, mercury poisoning
Neoplasia Especially with bone-marrow infiltration
Severe haemorrhage or
haemolysis
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Haematology Team431
Neutropenia
(Decreased number of neutrophils)
Causes:
Drugs Selective neutropenia
Agranulocytosis (Aplastic anaemia)
Infections Viral – including hepatitis, influenza, rubella
Bacterial – typhoid fever, brucellosis, military tuberculosis
Rickettsial and protozoal infections (Sometimes)
Megaloblastic Anaemia Vitamin B12 or folate deficiency
Chronic neutropenia Chronic idiopathic neutropenia
Immune neutropenia
Congenital neutropenias
Cyclical neutropenia
Hypersplenism Primary
In association with cirrhosis, Felty’s syndrome, etc…
Ionizing radiation and Radiotherapy
cytotoxic drugs Alkylating agents, antimetabolites, others
Malignant disease Acute leukaemia
Leuco-erythroblastic anaemia due to metastatic
carcinoma, multiple myeloma or lymphoma
Micscellaneous Systemic lupus erythematosus, myxoedema,
conditions hypopituitrism, iron deficiency, anaphylactic shock
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Haematology Team431
Lymphopenia
(Decreased number of lymphocytes)
Causes:
Mostly from gut as in intestinal lymphangiectasia,
Loss
Whipple’s disease and rarely Crohn’s disease
Thoracic-duct fistula
Primary, or secondary to gut disease
Maturation
Vit B12 or folate deficiency
Zinc deficiency
Antilymphocyte globulin
Pharmacological agents Corticosteroids
Cytotoxic drugs
Severe septicaemias
Infections Influenza, occasionally other virus infections
Colorado tick fever
Miliary tuberculosis
Collagen vascular diseases, especially SLE
Other miscellaneous conditions Malignant disease
Other conditions with lymhocytotoxins
Radiotherapy
Graft-versus-host disease
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Haematology Team431
Leukocyte Morphological Abnormalities
Congenital abnormalities
Characterized by giant platelets
Large granules
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Acquired anomalies:
Indicate bacterial infection
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Additional information
Complete Blood Count test (CBC)
Normal Range
White Blood Cells (WBCs) 4 – 11 x 109 / L
Hemoglobin (HGB) 120 – 160 g / L
Platelets (PLT) 140 – 450 x109 / L
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Case 1
• History:
This 20 year old male came to the emergency room with severe abdominal pain in the
right lower quadrant. He had a fever of 39 0C. On examination, he had a rigid abdomen
& rebound tenderness in the right lower quadrant. There were no other abnormalities.
Urinalysis was within normal limits. A CBC showed Hgb 140 g/l, WBC 25 x 109/L,
and platelet count 350 X 109/L.
What are the WBCs predominantly seen?
Mainly neutrophils
Notice that the WBC count is higher than in a normal smear.
In addition a small but increased number of band forms are seen.
The platelets are moderately increased in number.
What is the name for this type of leukocyte reaction?
This reaction is known as Neutrophilia.
What do you think the diagnosis is?
The diagnosis is acute appendicitis.
(Most, but not all, cases of acute appendicitis are associated with Neutrophilia).
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Case 2
• History:
This 17 year old female was sent home from summer camp because of
weakness, lassitude, and sore throat. On examination she was found to have an
inflamed pharynx, enlarged tonsils, several enlarged and slightly tender lymph
nodes in the neck, a palpable spleen, and a tender palpable liver edge.
CBC showed Hgb 149 g/l, WBC 12.5 X 109/L, and platelet count 282 X 109/L
What are the WBCs predominantly seen?
The predominant cells are lymphocytes with many atypical lymphocytes.
What is your diagnosis in this case?
Infectious mononucleosis.
What is the differential diagnosis?
- Other viral infections including hepatitis and cytomegalovirus.
- It should not be confused with leukemia.
What other laboratory test that may be helpful in arriving at a specific diagnosis?
Serologic test for infectious mononucleosis like Paul-Bunnell (Monospot) test
would confirm the diagnosis in most cases.
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Questions:
1- What is the WBCs abnormality that can be seen in a patient with
pertussis?
A –Eosinophilia
B – Monocytosis
C –Lymphocytosis
2- Lymphopenia is found in patients with :
A – Milliary TB
B – Acute leukemia
C – Carcinoma of the ovary
3- May – Hegglin Anomaly characterized by :
A- Large granules
B- Giant platelets
C- Hyper segmented neutrophil
Answers:
C,A,B
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