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Flow Cell Cytometry (FCC)
Hematology
25
Biology
Not Applicable
11/29/2011

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Term
Flow Cell Cytometry
Definition
Used to count, examine, and sort microscopic particles or molecules on or inside the cell
Done by Hydromatic Focusing
Can detect Fluorochromes
Measures volume, morphology, cell pigmentation, DNA, RNA, chromosomes, proteins, antigens, enzymatic reactions, etc.
Results are in the form of histograms or scattergrams
Term
Hydromatic Focusing
Definition
Done by focusing a stream of cells to allow a single cell to be passed through a detector, one cell a time
Measures Forward Scatter and Side Scatter
Term
Forward Scatter
Definition
Measures size
Term
Side Scatter
Definition
Measures complexity
Term
Fluorochromes
Definition
Bound to fluorescent markers that attach to different particles
Differentiate between different types of particles
Allow you to analyze multiple parameters in large numbers of cells
Term
Immunophenotyping
Definition
Identifies antigens using detection antibodies or fluorochromes
Detects CD markers
Specimens require gating
Term
CD Markers
Definition
Proteins that are marked and analyzed
Can change as the cell matures
Abnormal cells have different ones
Term
Gating
Definition
eg: Lyse RBC's and use a density gradient to remove platelets in order to look for WBC's
Term
Reticulocyte Counting
Definition
Involves a fluorescent dye binding to the residual RNA in retics
Used to see if the bone marrow is recovering after transplants, to see if EPO treatment is working, or to see if folate/B12 treatment is working
Term
Immature Reticulocyte Fraction (IRF)
Definition
Measure of the amount of RNA
First indication of disease
Term
DNA Analysis
Definition
Measures Proliferation and Ploidy
Can predict diseases that are due to DNA abnormalities
Term
Proliferation
Definition
Determines the portion of dividing cells
If slow, there is a poorer prognosis
Term
Ploidy
Definition
Abnormal number of chromosomes
Term
Chromosome Analysis
Definition
Looks for changes in structure and morphology
Specimens must be undergoing mitosis or in the division state
Involves harvesting and banding
Detects 3 types of aberrations (Numberical, Structural, and Polymorphic)
Term
Numerical Aberrations
Definition
Anaploidy
Hyperdiploidy
Hypodiploidy
Term
Anaploidy
Definition
Above or below 46 chromosomes
Term
Hyperploidy
Definition
More than 46 chromosomes
Term
Hypoploidy
Definition
Less than 46 chromosomes
Term
Structural Aberrations
Definition
Breaks, Deletions, Translocations
Most common in lymphomas and leukemias
Term
Polymorphic Aberrations
Definition
Do not cause dysfunction
Term
Molecular Analysis Methods
Definition
Southern Blot
PCR
In-situ Hybridization
Fluorescence In-situ Hybridization
DNA Sequencing
Term
Southern Blot
Definition
6 steps
-DNA is isolated by a chemical or detergent
-DNA is cut using restrictive enzymes
-DNA is separated using gel electrophoresis
-DNA is denatured into a single strand
-DNA is placed onto a media
-DNA is probed for specific sequences
Term
PCR
Definition
DNA is amplified by DNA polymerase in in-vitro enzymatic replication
Term
Fluorescence In-situ Hybridization
Definition
Uses flourescent DNA to assess chromosomal integrity, for prognostic stratification, to see if there is a response to different treatments, and to see how much residual disease there is
Term
DNA Sequencing
Definition
Determines the order of a nucleotide sequence
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