prepared by: mr:mahmoud el-hindi miss:afnan abdelmoneim lab 12: blood & bone marrow smears
TRANSCRIPT
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Prepared by:
Mr:Mahmoud El-Hindi
Miss:Afnan Abdelmoneim
LAB 12:BLOOD &
BONE MARROW SMEARS
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OBJECTIVES
1. Handling and evaluation of blood &
bone marrow smears.
2. Understand methods for detection
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INTRODUCTION
• A peripheral blood smear (or blood film):is
a thin layer of blood smeared on a glass
microscope slide and then stained in such a way
as to allow the various blood cells to be
examined microscopically.
• Blood films are examined in the investigation of
hematological (blood) disorders and are routinely
employed to look for blood parasites, such as
those of malaria and filariasis.
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PREPARATION• Blood films are made by placing a drop of
blood on one end of a slide.
• Using a spreader slide to disperse the blood
over the slide's length.
• The aim is to get a region; called a
monolayer.
• where the cells are spaced far enough apart
to be counted and differentiated.
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CONT..
• The slide is left to air dry, after which the
blood is fixed to the slide by immersing it
briefly in methanol.
• The fixative is essential for good staining
and presentation of cellular detail.
• After fixation, the slide is stained to
distinguish the cells from each other.
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CONT..
Wright-Giemsa combination stain is also a
popular choice.
These stains allow for the detection of white
blood cell, red blood cell, and platelet
abnormalities. Hematopathologists often use
other specialized stains to aid in the
differential diagnosis of blood disorders.
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CONT..
After staining, the monolayer is viewed
under a microscope using magnification
up to 1000x. Individual cells are examined
and their morphology is characterized and
recorded.
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THERE ARE THREE MAIN CELLS WITHIN THE BLOOD THAT THE TEST FOCUSES ON:
• red cells (which carry oxygen throughout
the body)
• white cells (which function as part of the
body’s immune system).
• platelets (which are important for blood
clotting)
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CONT..
Abnormalities in the shape, size, and
number of the red blood cells can affect
how oxygen travels throughout the
blood. These abnormalities are often
caused by a mineral or vitamin
deficiency, but can be caused by
abnormal proteins such as in sickle cell
anemia.
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CONT..
White blood cells are an integral part of the
body’s immune system, a network of
tissues and cells that function to keep the
body safe from invading microorganisms
and eliminate existing infection. Disorders
affecting these cells can often result in the
body’s inability to eliminate or control
infections.
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CONT..
Platelet disorders affect blood clotting
and are often the result of the body
producing the wrong amount of platelets
needed (either too many or too few).
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OVERVIEW
Evaluation of complete blood count data
and examination of a peripheral blood
smear are the first diagnostic steps in
defining a hematologic disease.
The information gathered from examination
of these data may dictate subsequent
diagnostic tests and procedures.
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CONT..
The reliability of the information obtained
from the smear depends to a considerable
extent on the quality of the preparation.
Properly spread films are essential to
accurate work. The slides must be
perfectly clean and free of grease.
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DISORDERS
Characteristic red blood cell abnormalities
are anemia, sickle cell anemia and
spherocytosis. Sometimes the microscopic
investigation of the red cells can be
essential to the diagnosis of life-
threatening disease (e.g. TTP).
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CONT..
White blood cells are classified according
to their propensity to stain with particular
substances, the shape of the nuclei and
the granular inclusions.
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BLOOD DISORDERS AFFECTING
RED BLOOD CELLS
Anemia : People with anemia have a low
number of red blood cells.
Mild anemia often causes no symptoms.
More severe anemia can cause fatigue,
pale skin, and shortness of breath with
exertion
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CONT..
Aplastic anemia: In people with aplastic
anemia, the bone marrow does not produce
enough blood cells, including red blood cells.
• A viral infection, drug side effect, or an
autoimmune condition can cause aplastic
anemia.
• Medications, blood transfusions, and even a
bone marrow transplant, may be required to
treat aplastic anemia
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CONT..
Sickle cell anemia: A genetic condition
that affects mostly people .
In sickle cell anemia, the red blood cells
are sticky and stiff. They can block blood
flow. Severe pain and organ damage can
occur.
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CONT..
Polycythemia vera: The body produces
too many blood cells, from an unknown
cause.
The excess red blood cells usually create
no problems but may cause blood clots in
some people.
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CONT..
Malaria: A mosquito's bite transmits a
parasite into a person's blood, where it
infects red blood cells.
• Periodically, the red blood cells rupture,
causing fever, chills, and organ damage.
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BONE MARROW ASPIRATE SMEARS
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INTRODUCTION
Bone marrow examination refers to the
pathologic analysis of samples of bone marrow
obtained by bone marrow biopsy (often called a
trephine biopsy) and bone marrow aspiration.
Bone marrow examination is used in the
diagnosis of a number of conditions, including
leukemia, multiple myeloma, lymphoma,
anemia, and pancytopenia
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CONT..
The bone marrow produces the cellular elements
of the blood, including platelets, red blood cells
and white blood cells.
While much information can be gleaned by testing
the blood itself (drawn from a vein by phlebotomy),
it is sometimes necessary to examine the source of
the blood cells in the bone marrow to obtain more
information on hematopoiesis; this is the role of
bone marrow aspiration and biopsy.
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NORMAL SMEAR
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A WRIGHT'S STAINED BONE MARROW ASPIRATE
SMEAR OF PATIENT WITH PRECURSOR B-CELL
ACUTE LYMPHOBLASTIC LEUKEMIA .
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Multiple myeloma
Multiple myeloma is a malignant, clonal disorder
of plasma cells that originates in the bone
marrow.
• It’s a relatively common disorder, accounting
for 1% of all malignancies and 10% of all
hematologic malignancies in adults.
• Patients present with painful, lytic lesions of the
bones, recurrent and persistent infections,
weakness, renal failure, and hypercalcemia.
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CONT..
Patients with myeloma have a monoclonal
proliferation of plasma cells in the bone
marrow, meaning that there are a ton of
malignant plasma cells that all originated
from the same initial cell.
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