MEDT
475 - Clinical Hematology Practicum
Updated
Nov 2007 |
Clinical
Practicum Home
QUALITY
CONTROL
The student will complete
assigned readings in procedure manuals, handouts, and/or reference books.
Upon completion of this unit, the student will be able to:
-
Explain the rationale for a
quality control program in the clinical hematology lab.
-
List specific areas which require
surveillance.
-
Demonstrate how the performance
of specific reagents are evaluated and how often.
-
Discuss the necessity of keeping
written records of all surveillance.
-
Discuss the importance of periodic
review of surveillance records and documentation of corrective actions
taken.
top
of page
SPECIMEN
HANDLING/SAFETY
The first step in the accurate
diagnosis of disease is the proper collection and handling of specimens.
Specimen handling involves the following steps: proper specimen collection,
appropriate specimen containers, accurate labeling of forms and specimens,
timeliness of transport. Thorough knowledge of safety procedures is essential
before performing any duties in the clinical laboratory which might be
hazardous to personnel. Upon completion of this unit, the student will
be able to:
-
Explain the importance of proper
collection and transport of specimens.
-
Summarize criteria for evaluating
specimen quality and corrective actions to be taken to resolve problems.
-
Organize and label specimens
accurately.
-
Report results according to
laboratory protocol.
-
Demonstrate safe techniques
in handling and disposal of infectious materials according to laboratory
protocol.
top
of page
AUTOMATED
HEMATOLOGY INSTRUMENTATION
Automated Cell Counters
and Coagulation Instrumentation
Upon completion of this
unit, the student will be able to:
-
Operate automated cell counters
and coagulation instruments producing accurate patient results.
-
Identify inaccurate instrument
results.
-
Correlate patient results with
clinical significance.
-
Locate and explain the basic
operating components of each analyzer.
-
Demonstrate an understanding
of the maintenance routines for each instrument.
-
Perform daily maintenance routines.
-
Describe, prepare, and explain
the function of each reagent used on automated cell counters and coagulation
instruments.
-
State how reagents are stored
when not in use on the analyzer.
-
Discuss calibration of the hematology
automated cell counter and coagulation instruments.
-
Explain where to find basic
troubleshooting information about the analyzer.
Slide Stainer
Upon completion of this
unit, the student will be able to:
Perform an adjustment
of the stain, buffer, and rinse on the laboratory stainer, and be able
to produce a quality-stained blood smear.
Flow Cytometry Instrumentation
(when
Flow Cytometry instrumentation is not available at the clinical site, student
should refer to their text for reveiw)
Upon completion of this
unit, the student will be able to:
-
Discuss the basic principle
of flow cytometry.
-
List common fluorescent dyes
used in flow cytometry.
-
Discuss hematological applications
of flow cytometry.
-
Discuss cellular applications
of flow cytometry.
-
Discuss flow cytometry markers
used in the differentiation of various leukocytic disorders.
top
of page
DIFFERENTIALS
AND RBC MORPHOLOGY
Upon completion of the Hematology
practicum, the student will be able to:
-
Identify all the cells in the
myelocytic, monocytic, and lymphocytic series including a discussion of
the major characteristics pertinent to each.
-
Compare and contrast all of
the cells in the erythroid series.
-
Differentiate between the following:
eosinophils, basophils, lymphocytes, monocytes.
-
Differentiate between the following:
atypical lymphocytes, plasma cells, lymphoblasts.
-
Differentiate platelets from
other cells on a Wright's Stained blood smear, and be able to perform a
successful estimate from the smear.
-
Prepare good wedge smears and
buffy coat preparations.
-
Prepare a good manual stained
slide.
-
Judge if the white count matches
what is seen on the smear.
-
Distinguish abnormal platelet
shapes and large platelets and explain their significance.
-
Calculate a corrected white
count, based on the number of NRBC seen on the smear.
-
Differentiate and grade the
following on a Wright Stain smear:
-
sickle cells
-
acanthocytes
-
echinocytes
-
ovalocytes
-
elliptocytes
-
schistocytes
-
target cells
-
spherocytes
-
macrocytes
-
microcytes
-
teardrop cells
-
stomatocytes.
-
Evaluate a blood smear for RBC
morphology and correctly assess and grade the following:
-
polychromasia
-
basophilic stippling
-
Howell-Jolly bodies
-
Pappenheimer bodies
-
hypochromia
-
Identify malarial parasites.
-
Correctly assess a blood smear
for rouleaux.
-
Distinguish between normal and
hypersegmented PMNs on a blood smear and explain their significance.
-
Judge from the stained smear if the RDW
(Red Cell Distribution Width) is correct.
-
Evaluate a Wright's stained blood smear
for toxic granulation and Dohle bodies and explain their significance.
-
Differentiate vacuolation in PMNs from
other intra cellular structures and explain its significance.
-
Distinguish between normal and pyknotic
PMN, and explain their significance.
-
Identify smudge cells on a Wright's stained
blood smear.
-
Interpret RBC and WBC abnormalities in
relation to pathological conditions.
top
of page
BODY
FLUIDS
Upon completion of the Hematology
praticum, the student will be able to:
-
Determine the body source of each of the
following fluids:
-
CSF
-
synovial
-
pleural
-
peritoneal
-
pericardial
-
thoracentesis
-
Determine color and clarity of each body
fluid specimen and explain their significance.
-
Determine:
-
the
number of tubes normally taken for CSF (3-4)
-
which
tubes go to which department and why
-
Perform a cell count on the following
CSF:
-
clear
& colorless
-
slightly
hazy and colorless
-
cloudy
and white
-
cloudy
and red
-
grossly
bloody
-
amber
and clear
-
Explain how to determine if a specimen
was a bloody tap.
-
Explain the significance of a 500:1 RBC
to WBC ratio.
-
Determine when a dilution is necessary,
what dilution to make, and how to multiply the number of cells counted
by the dilution factor to get an accurate result.
-
Make a cytospin preparation from body
fluids and stain smears.
-
Examine a prepared smear of a body fluid
and identify the cells present.
-
Examine cytospin preparations and identify
the cell types present.
-
State the common characteristics (e.g.,
cell type) of a) viral meningitis and b) bacterial meningitis and be able
to explain why it is important to differentiate between the two.
-
Discuss the reasons why CSF from leukemic
patients should always have a cell count and differential (or cytospin
if available).
-
Explain the significance of crenated RBC
in CSF.
-
Explain why body fluid cell counts should
be performed immediately upon arrival in the laboratory.
-
Distinguish a CSF that is contaminated
with bone marrow.
-
Explain "xanthochromia" in body fluids.
-
Explain the general characteristics of
malignant cells.
top
of page
RBC
PATHOPHYSIOLOGY
Glucose-6-Phosphate Dehydrogenase Screen
Upon completion of the Hematology
practicum, the student will be able to:
-
Discuss the principle of the glucose-6-phosphate
dehydrogenase (G6PD) screening test.
-
Discuss the problems involved with the
test when using blood from a patient that has been transfused.
-
Discuss the problems involved with the
test when using blood from a patient that has a high percentage of reticulocytes,
e.g., after a hemolytic episode.
-
Discuss the function and importance of
G6PD in the Hexose Monophosphate Shunt.
Sickle Cell Preps
Upon completion of the Hematology
practicum, the student will be able to:
-
Explain the principle involved in solubility
tests that analyze for the presence of sickling hemoglobin.
-
Describe the technique and method used
to set up a sample for a sickle solubility test.
-
Discuss and describe a quality control
procedure that is acceptable for the above procedures.
-
Discuss the importance of the Hemoglobin-S
concentration in the solubility tests and the need to adjust for a low
hemoglobin.
top
of page
LEUKOCYTE
PATHOPHYSIOLOGY
Cytochemical Stains
Upon completion of the Hematology
practicum, the student will be able to:
-
Discuss the purpose for performing cytochemical
stains.
-
Discuss the principles of the following
cytochemical stains:
-
Periodic
Acid Schiff
-
Peroxidase
-
Sudan
Black
-
NASDA/NASDA-F
-
Non-specific
esterase
-
Chloracetate
esterase
-
Acid
Phosphatase (TRAP)
-
Differentiate the expected results for
each of the stains listed in objective #2 for the following disease states,
and be able to interpret the results from each.
-
Acute
Lymphocytic Leukemia
-
Acute
Myelocytic Leukemia (M0, M1, M2, M3)
-
Acute
Myelomonocytic Leukemia
-
Acute
Monocytic Leukemia
-
Erythroleukemia
-
Acute
Megakaryoblastic Leukemia
-
Compare and contrast the expected staining
reactions for the stains listed in objective #2 for the following:
-
Normal
myeloid cell series
-
Normal
lymphocytes
-
Normal
monocytes
-
Normal
platelets, megakaryocytes
-
Normal
nucleated RBC's
Leukocyte Alkaline Phosphatase Stain
Upon completion of the Hematology
practicum, the student will be able to:
-
Explain the principle in the Leukocyte
Alkaline Phosphatase (LAP) staining procedure.
-
Explain the procedure involved and be
able to perform a Kaplow count.
-
Explain the necessity of staining a normal
control slide with each set of patient slides.
-
Explain the necessity for establishing
a normal range for each laboratory.
-
Discuss the importance of the LAP test
in distinguishing a leukemic myeloid process from a non-leukemic myeloid
reaction and be able to evaluate the disease (condition) based on the LAP
score.
top
of page
ROUTINE
AND MISC. HEMATOLOGY PROCEDURES
Erythrocyte Sedimentation Rate
Upon completion of the Hematology
practicum, the student will be able to:
-
State the normal reference ranges for
an adult male, adult female, and children.
-
Discuss the procedure involved in setting
up a sedrate.
-
Discuss anemia and its relationship to
the sedrate.
-
Explain how coldness of the blood, polycythemia,
rouleaux, and agglutination will affect the sedrate.
-
Explain how certain RBC shapes cause a
decreased sedrate.
-
Judge whether a specimen is acceptable
for a sedrate determination.
-
Evaluate the sedrate as a diagnostic tool.
Reticulocyte Counts
Upon completion of the Hematology
practicum, the student will be able to:
-
Explain the procedure used in staining
reticulocytes.
-
Describe the method for counting the reticulocytes
and how to calculate the percent.
-
Discuss the implications of considering
only the % reticulocytes rather than the absolute number of reticulocytes.
-
Clarify the type of stain that is used
to stain reticulocytes and the significance of this type of stain.
-
Discuss the role of a reticulocyte. This
includes shift macrocytosis, response to stress, and normal reference range.
-
Compare polychromasia on a smear to the
reticulocyte count.
-
Explain the importance of proper mixing
of the specimen immediately before the smears are made.
- Discuss the clinical implications of the immature reticulocyte fraction (IRF).
Bone Marrows
Upon completion of the Hematology
practicum, the student will be able to:
-
State the site from which bone marrow
is most commonly aspirated.
-
Review the general procedure of bone marrow
aspiration.
-
Explain the technique used by the Hematology
technologists in preparing bone marrow smears and staining procedures.
-
Define hypoplasia and hyperplasia of the
bone marrow.
-
State the normal myeloid:erythroid ratio
of the bone marrow.
-
Participate in as many bone marrow aspirations
as possible and examine at least one bone marrow sample under the microscope.
Manual Platelets
Upon completion of the Hematology
practicum, the student will be able to:
-
State the normal reference range for a
platelet count.
-
Explain the method for diluting a specimen
for a manual platelet count and perform it properly.
-
State the reason for using ammonium oxalate
as the unopette diluent.
-
Clarify the method employed in counting
the platelet count and include the type of hemocytometer used, type of
microscope used, area of hemocytometer counted, and the factor.
-
Explain the rationale for placing the
hemocytometer in a moist petri disk for 10-15 minutes before performing
the platelet count.
-
Describe the method employed in doing
a platelet estimate.
-
Compare the platelet count and estimate,
and decide if they correlate.
-
Discuss procedures that are followed when
the platelet count and the platelet estimate don't match.
-
Distinguish dirt, bubbles, inclusion bodies,
and uneven distribution of platelets on hemocytometer.
-
Explain the effect an uneven distribution
of platelets on the hemocytometer can have on the platelet count. Describe
corrective action to be taken should this occur.
-
Discuss the principle of the phase microscope.
-
Discuss disease states that may have abnormal
platelet counts or morphology.
-
Explain how the patient's hematocrit and
the thickness of the smear can affect the platelet estimate.
*Objectives are considered electives or enhancements
to the basic clinical practicum educational experience.
Total Eosinophil Counts*
Upon completion of this unit, the
student will be able to:
-
Explain and perform the technique used
in diluting blood for a total eosinophil count.
-
Discuss and perform the technique used
in plating and counting a total eosinophil count.
-
Explain the derivation of the factor used
in the total eosinophil count for each of the hemocytometers.
-
Compare the total eosinophil count to
the absolute number and decide if they correlate. Describe steps to be
taken if the two methods fail to show good correlation.
Urine Hemosiderin*
Upon completion of this unit, the
student will be able to:
-
Define urine hemosiderin.
-
Discuss the significance of urine hemosiderin,
including how it is formed.
-
Clarify the procedure involved in the
smear preparation.
-
Explain the principle of the Prussian
Blue stain.
-
Examine any specimens received for urine
hemosiderin.
-
Explain and perform the procedure involved
in performing a Prussian Blue stain.
-
Discuss the importance of filtering reagents
for a Prussian Blue stain.
-
State the procedure for specimen collection.
Nasal Smears*
Upon completion of this unit, the
student will be able to:
-
Discuss the importance of nasal smears.
-
Explain the procedure used to collect
the specimens.
-
Clarify the procedure used to prepare
and stain the smears.
-
Summarize the smear examination procedure.
-
Examine any nasal smears that are available.
Manual WBC & RBC Whole Blood Counts
Upon completion of the Hematology
practicum, the student will be able to:
-
State the normal reference ranges for
white blood cell counts and red blood cell counts for adult males and females.
-
Clarify the principle ingredients in the
RCB and WBC diluting fluid and the purpose of each.
-
Perform the steps required to dilute whole
blood for a manual WBC and RBC count.
-
Perform the method used in plating and
counting a WBC and RBC count and discuss the proper counting areas for
WBC & RBC counts.
-
Distinguish between properly and improperly
filled counting chambers.
-
Perform the calculation of WBC and RBC
counts and include correction for dilution and derivation of the appropriate
correction factor for volume of a hemocytometer with Neubauer ruling.
top
of page
COAGULATION
Upon completion of the Hematology
practicum, the student will be able to:
-
Explain platelet function following subendothelial
exposure and include the steps involved in adhesion, release, and aggregation.
-
State site of production of the proteins
involved in coagulation, including factor VIII:C and factor VIII:VWF.
-
Discuss the coagulation factors dependent
on vitamin K for their complete synthesis and the role of vitamin K in
the hepatic synthesis of these factors.
-
List the coagulation factors that are
components of the intrinsic system.
-
Describe the coagulation factors that
are components of the extrinsic system and how this system is initiated
in
vivo.
-
Explain the action and function of antithrombin
and it's relationship to heparin.
-
Clarify the function of protein C including
site of production and the clinical significance of a protein C deficiency.
-
Name components of hemostatic function
that are measured by the bleeding time.
-
Explain the principle of platelet aggregometry
including the most common substances that either aggregate platelets directly
or induce the release of platelet ADP.
-
Discuss the principle of the prothrombin
time (PT) test including reagents used and their major components, methodology,
coagulation factors measured, and normal reference range.
-
Compare prolonged prothrombin times with
clinical conditions and/or disease states.
-
Discuss the purpose of the International
Normalized Ratio (INR) for reporting prothrombin time test results for
patients who are undergoing oral anticoagulant therapy.
-
Given the patient's prothrombin time and
the International Sensitivity Index (ISI), calculate the INR.
-
Discuss the principle of the activated
partial thromboplastin time (APTT) test including reagents used and their
major components, methodology, coagulation factors measured, and normal
reference range.
-
Compare prolonged activated partial thromboplastin
times with clinical conditions and/or disease states.
-
Discuss the principle of "mixing studies"
performed on patients with prolonged PT and/or APTT results. Discuss what
is indicated when a prolonged patient APTT is "corrected" by the addition
of normal plasma and what is indicated when a prolonged patient APTT is
not "corrected" by the addition of normal plasma.
-
Compare and contrast the principle of
specific coagulation factor assay tests.
-
Discuss the principle of the thrombin
time test, including reagents used, and methodology.
-
Explain the principle of quantitative
fibrinogen determinations using a modification of the thrombin time test,
including reagents used and normal reference range. Be able to correlate
abnormal results with clinical conditions and/or disease states.
-
Discuss the affect of the lupus anticoagulants
on the PT, APTT, factor assay, and mixing studies. Also indicate
the action of lupus anticoagulants on both in vivo and in vitro
coagulation systems.
-
Compare the principles of the laboratory
tests used most frequently to diagnose von Willebrand's Disease for bleeding
time, PT, APTT, factor VIII:C assay, factor VII, ristocetin cofactor activity,
factor VIII:VWF antigen, and platelet aggregation studies.
-
Compare patterns of inheritance for hemophilia
A and hemophilia B, and state the specific factor deficiency for each disorder.
-
Explain the effect of circulating factor
VIII:C antibodies on hemophilic patients.
-
Explain the effect of vitamin K deficiency
on PT and APTT results.
-
Clarify the effect of coumarin compounds
on the synthesis and activation of the vitamin K-dependent coagulation
factors. Discuss the rationale for coumarin therapy and state optimal therapeutic
range of the PT for patients on coumarin therapy. Describe the effect of
this therapy on the APTT.
-
Explain the uses of therapeutic heparin
and the effect this anticoagulant has on coagulation tests.
-
Discuss the process of disseminated intravascular
coagulation. List common clinical problems associated with excessive activation
on the extrinsic pathway.
-
Explain the effect of DIC on antithrombin,
protein C, coagulation factor and platelet levels. Explain why examination
of a peripheral blood smear is important when DIC is suspected.
-
Compare and contrast the type of expected
coagulation results (D-dimers, PT, APTT, thrombin time, platelet count,
fibrinogen) in patients with DIC and associated fibrinolysis who are bleeding.
-
Discuss different endpoint detection methodologies
used to detect clot formation by coagulation analyzers.
-
Explain the significance of improperly
filled sodium citrate (blue top) tubes and the proper steps to be taken
when this situation arises.
-
Explain the principle of the D-dimers
test, the significance of elevated levels of D-dimers, and the importance
of a negative D-dimers in terms of deep venous thrombosis.
-
Discuss the laboratory procedures used
in the determination of Factor V Lieden, APC resistance, Prothrombin mutation
and hyperhomocysteinemia.
-
Interpret coagulation results in relation
to pathological conditions.
- Discuss the clinical and laboratory implications of aspirin resistance.
MOLECULAR
DIAGNOSTIC and IMMUNOLOGIC ASSAYS
Upon completion of this unit, the student will be able to:
- At each affiliate laboratory, identify the molecular diagnostic assays utilized.
- Explain the principle of each assay listed in #1.
- For each assay listed in #1, discuss its clinical significance (e.g., impact on diagnosis or treatment of associated disease).
- Perform molecular diagnostic assays available at the affiliate site.
- List the assays and identify the analyte in the affiliate's laboratory that utilize diagnostic immunologic techniques.
- Explain the principle of each assay listed in #2.
- For each assay listed in #2, discuss its clinical significance (e.g. impact on diagnosis)
- Perform immunological assays offered by the affiliate.
top
of page
Clinical
Practicum Home