4. INTRODUCTION
⢠The formation of blood cellular components-
occurs during embryonic development and
throughout adulthood to produce and replenish
the blood system. Furthermore hematopoietic
stem cells ( HSCs) can be used as a model system
for understanding tissue stem cells and their role
in ageing and oncogenesis. Hematologic
activities, such as red blood cell formation and
the clotting cascade, require a complex series of
events to allow good health andhomeostasis.
Without leukocytes to protect us, our bodies
could succumb to disease and infection
5. HEMATOPOIETIC SYSTEM
⢠Hematology is the study of blood and blood forming
tissue. This include the bone marrow, blood , spleen
and lymph system. A basic knowledge of hematology
is useful in clinical setting to evaluate the patient
ability to transport oxygen and carbon dioxide,
coagulation blood and combat infections.
Assessment of the hematology system is based on
the patient's health history , physical examination ,
and result of diagnostic studies .
9. HEMATOPOIESIS
⢠Hematopoiesis is the formation of blood cellular
components. All cellular blood components are derived
from hematopoietic. In a healthy adult person,
approximately 1011â1012 new blood cells are produced
daily in order to maintain steady state levels in the
peripheral circulation.
⢠This stem cell is the âMother Cellâ or the originator of
all blood cells. It has the ability to selfârenew and
create progenitor stem cell lines. They are naturally
limited in number. By reviewing the chart, you can see
that all cells come from the stem cell. An attack on the
stem cell can theoretically affect all cells similarly.
10.
11. Erythrocytes
Erythrocytes, or red blood cells (RBCs), originate from a
stem cell. Vitamin B12, folic acid, iron, and copper are
essential in the formation of erythrocytes. Erythropoietin
is a hormone released by the kidneys in response to
hypoxemia, which stimulates the bone marrow to produce
red blood cells. Typically, red blood cells live approximately
120 days. When the red blood cells become old and
damaged, the liver, spleen, and bone marrow cleanse
them from the blood. Increases or decreases in the red
blood cell count indicate an abnormality. Please note that
laboratory values given in this course are reference ranges
only, as values vary at different laboratories.
Normal RBC Range:
Males: 4.5 â 5.9 mil/dL
Females: 4.0 â 5.2 mil/dL
12. Reticulocytes
The reticulocytes is immature erythrocyte. When
released from the bone marrow, red blood cells are
slightly immature and are known as reticulocytes.
Reticulocytes mature into red blood cells within a
few days. The number of reticulocytes in the blood
indicates the amount of bone marrow activity. Low
reticulocyte counts may be due to vitamin
deficiency, liver cirrhosis, or radiation therapy.
Normal Reticulocyte Range: 0.5â2.5% of RBCs
13. Leukocytes
Leakocytes appear white when separated from blood . Like the
erythrocytes , leukocytes orignates from stem cells within bone marrow.
Leukocytes are typically classified as either:
ďˇGranular leukocytes
ďś Neutrophils
ďś Eosinophils
ďś Basophils
ďˇNonâgranular leukocytes
ďś Lymphocytes
ďś Monocytes
Normal Leukocyte Range: 4,000 â10,000 / uL
14. Platelets
Platelets are small, colorless cells that have a lifespan of seven
to ten days.
Blood Clotting: Platelets perform three major roles:
1) Decreasing the luminal size of damaged vessels to
decrease blood loss.
2) Forming blockages in injured vessels to decrease blood
loss.
3) Providing support accelerate blood coagulation through
molecules on the surface of the platelets.
Normal Platelet Range: 150,000 â 450,000 /mm3
15.
16. NORMAL CLOTTING MECHANISM:
⢠The process is important in minimizing blood loss when
various body structure are injured. Three components
contributing to normal clotting: vascular response, platelet
response and plasma clotting factors.
ďś Vascular response
ďś Platelet response
ďś Plasma clotting factor
18. LYMPH SYSTEM
⢠The lymph system also returns excess interstitial fluid to the blood,
which is important in preventing the development of edema.
Lymph fluid is pale yellow interstitial fluid that has diffused through
lymphatic capillary walls. It circulates through a special vasculature,
much as blood moves through blood vessels. The formation of
lymph fluid increases when interstitial fluid increases, thereby
forcing more fluid into the lymph system.
⢠When too much interstitial fluid develops or when something
interferes with the reabsorption of lymph, lymphedema develops.
The lymphedema that may occur as a complication Of mastectomy
or lumpectomy with dissection of axillary nodes is often caused by
the obstruction of lymph flow from the removal of lymph nodes.
The lymphatic capillaries are thin-walled vessels that have an
irregular diameter. They are somewhat larger than blood capillaries
and do not contain valves. Lymphatic capillaries unite to form
lymphatic vessels that carry all lymph fluid to either the right
lymphatic duct or the thoracic duct. These large lymphatic ducts
drain into subclavian veins in the neck
19. LIVER
Function
ďź Involved in bile production
ďź Erythropoiesis (during fetal life and when bone
marrow production is insufficient
ďź Kupffer cells of the liver have reticuloendothelial
function as histiocytes; phagocytic activity and iron
storage.
ďź Synthesis of clotting factors, synthesis of
antithrombins
20. ASSESSMENT OF HEMATOLOGY
SYSTEM
HISTORY:
ďź Biographical and demographic data
ďź Current Health
-Chief complaint
-Symptom analysis
ďź Past health history
ďź Family health history
ďź Psychological history
21. HEAD TO TOE EXAMINATION
ďźSkin
ďźEyes
ďźEars
ďźNose
ďźMouth
26. The normal levels of the types of
hemoglobin in adults are:
Type of hemoglobin Percentage
hemoglobin A 95% to 98%
hemoglobin A2 2% to 3%
hemoglobin F 1% to 2%
hemoglobin S 0%
hemoglobin C 0%
27. Perpheral Blood Smear
⢠Normocyte â cells of normal size and shape
⢠Normochromic â cells of normal color
⢠Anisocytes â vary from normal size
⢠Poikilocytes â abnormally shaped
⢠Microcyte â abnormally small (< 6 mm )
⢠Macrocyte â Abnormally large (> 9 mm )
⢠Hypochromic cells â pale appreance because of abnormally low HB
⢠Spherocytes â relatively small and round rather than biconcave
⢠Schistocytes- fragmented with bizarre shape
⢠Sickle shape â sickle shape due to presence of abnormal
hemoglobin (Hb S)
⢠Target cell â thin, with small amount in center
28. ďźANTIGLOBULIN TESTS-
-The direct coombâs test â
- Indirect coombâs test â
ďźCoagulation screening tests â
Four basic laboratory tests are performed to discern whether the
bleeding problem is related to a coagulation or vascular effect.
These are bleeding time, PT, PTT, INR.
Normal value-
PT - 11-15 sec
INR - 2-3.5
PTT - 25-38 sec
Fibrinogen level - 200-400 mg/dl
Bleeding time â 3 to 8 minutes
29. ďź Additional Screen Test
1) D Dimer test
2) Fibrinogen level
3) Fibrin degradation products
4) Capillary fragility test
ďź Platelet Aggreation Test
30. PLATELET AGGREGATION TEST
â an autoimmune disorder (such as systemic lupus
erythematosus)
â genetic disorders (including Bernard-Soulier
syndrome, Von Willebrand disease, Glanzmannâs
thrombasthenia, or platelet storage pool disease)
â medication side effects (that affect platelet function)
â myeloproliferative disorders (such as certain types
of leukemia)
â uremia (a condition caused by significant kidney disease)
31. LEUKOCYTE ALKALINE PHOSPHATE
TEST â
⢠Leukemoid reaction, an elevated white blood cell count thatâs
not caused by infection or cancer
⢠Essential thrombocytosis, an overproduction of blood
platelets
⢠Myelofibrosis, a disorder in which scarring of the bone
marrow occurs
⢠Polycythemia vera, a disorder in which your bone marrow
makes too many red blood cells
⢠Aplastic anemia, a disorder in which your bone marrow makes
too few blood cells
⢠Pernicious anemia, a drop in red blood cells often caused by
the stomachâs inability to absorb vitamin B12
32. SERUM IRON TEST
⢠Serum iron
⢠Serum ferritin
⢠Total iron-binding capacity (TIBC)
⢠Unsaturated iron-binding capacity (UIBC).-
⢠Transferrin saturation-
33. BIOPSY
⢠Bone Marrow Examination: Technique involve removal of bone marrow
through a locally anesthetized site to evaluate the status of blood forming
tissue. It is used to diagnose multiple myeloma, all type of leukemia, and
some lymphomas and to stage some solid tumors.
⢠Lymph nodes Biopsy: Purpose to obtain lymph tissue for histologic
examination to determine diagnosis and therapy.
⢠Open Biopsy: Test is to perform in operating room with direct
visualization of the area.
⢠Closed ( Needle) Biopsy: Test is perform at bedside or in office.
35. IMMUNOLOGICAL STATUS TEST
Cell Total
lymphocy
te count
Absolute
count
decrease
d
increased
T cells 56-77% 860-
1800/mm
3
AIDS,
leukemia
Acute
leukemia
B cells 7-17% 140-
370/mm3
leukemia Chronic
leukemia
CD 4 32-54% 530-
1190/mm
3
AIDS
CD 8 24-37% 430-
1060/mm
3
AIDS
37. ⢠Complement assays â
Disorder that are related to a lack of normal levels of
complement components may be detected by the level of the
total serum complement (CH50) or may requiring measuring
levels of specific complement components such as c3 and c4.
38. SKIN TEST
⢠Patch test
⢠Scratch test
⢠Delayed type hypersensitivity testing
39. SUMMARY
⢠The formation of blood cellular components- occurs during
embryonic development and throughout adulthood to
produce and replenish the blood system. A basic knowledge
of hematology is useful in clinical setting to evaluate the
patient ability to transport oxygen and carbon dioxide,
coagulation blood and combat infections. we discuss the
composition and function of blood. This stem cell is the
âMother Cellâ or the originator of all blood cells. It has the
ability to selfârenew and create progenitor stem cell lines.
They are naturally limited in number. The CBC includes the
RBC count, hemoglobin, Hematocrit, RBC indices, WBC count
with and without differential and platelet count.
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