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Hematology II- EXAM 4 - INSTRUMENTATION
Terms in this set (28)
Match the following technologies used for determing WBC differentials with the instrument on which they are used:
*Peroxidase, optical scatter, and absorbance
A 47 year old woman was admitted to the hospital for elective surgery. Her bleeding history was unremarkable. Results from her admission CBC revealed normal RBC parameters, an increased WBC count, and a decreased PLT count. The Coulter WBC histogram revealed a large shoulder to the left of the lymphocyte region accompained by a R1 flag. The letter "H" appeared next to the WBC count. What should be done first, to verify these results?
d. examine the patient;s stained peripheral blood smear for platelet clumps and/ or NRBC's.
An RBC histogram that shows an RBC distributation curve that is shifted to the left is characteristic of ehich of the following?
Both electromechanical and photo-optical principles of clot detection are available on the:
d. Sigma AMAX CS-190 instrument
Data output from three-part differential counters includes:
d. all of the above
For the Abbott CELL-DYN Sapphire, which parameter is directly measured?
b. platelet count
For the Sysmex XN series instrument, which parameter is derived from a histogram or scattergram?
c. mean cell volume
For the Sysmex XN series, which of the following technologies is NOT used in the categorization of leukocyte cell types?
c. optical light scatter
For this coagulation instrument, clot formation is deteted by the flow of current between two sensory electrodes:
b. BBL Fibrometer instrument
Light scatter can be measured at several different angles. Foward-angle scatter is used to measure
a, cell vilume and size
Low voltage direct current is used to measure
b. total cell volume
On the Coulter instruments, hematocrit is a calculated value. Which of the following directly measured parameters is used in the calculation of that value?
Preventative Maintenance includes
a. instruments troubleshooting records
Region flags or R flags indicate which of the following:
1. a decresed RBC count
2. Specific locations of abnormalities in the WBC size distributation
3. erronous results
4. overlapping of two or more of the cell populations at the four threshold areas of the WBC size didtributation histogram
The Coulter LH 750 five part leukocyte differential is determined by the analysis of cellular characteristics as defined by:
d. Impendance, conductivity,and light scatter
The Coulter model S plus IV differentiates lympocytes, granulocytes, and mononuclear cells based on differences in:
c. nuclear size and cytoplasmic complexity
The Coulter principle for counting of cells is based upon the fact that:
a. isotonic soultions conduct electricity better than cells do
d. is electromechanical
The histogram includes
a. the white blood cell count
The MPV and PDW are paramter describing:
c. platelet size
The photo-optical principle of clot is based on the:
c. observation of increased absorbance as a fibrin clot forms
Thr RDW represents a parameter that quantifies relative:
The red cell aparture bath is also the site of counting of
The term parameter means
a. any numerical value that describes an entire population
What cellular characteristic is evaluated by radio frequency?
c. Cell density
What do leukocyte histograms display?
d. all of the above
Which of the following analyzers uses radio frequency as a means of detecting and differentiating leukocytes?
b. Sysmex XN series
Why is hydrodynamic focusing used in automated cell-counting instruments?
b. To prevent coincidence passage through the detection aperture
Sets with similar terms
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