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Hematology 1

Hematology in Practice - Lab Quiz 1 and Homework

QuestionAnswer
What anticoagulant is used to make peripheral blood smears? EDTA
What will stain dark blue (or purple) using a Wright-Giemsa stain? Cell nucleus
Which term means an increase in the variation of cell size? Anisocytosis
In performing a platelet estimate at 1000x magnification, the technologist sees an average of 20 platelets per field. How would you interpret this? Normal
What term means an increase in the average size of erythrocytes? Macrocytosis
What term means a decrease in the average size of erythrocytes? Microcytosis
In performing a platelet estimate at 1000x magnification, the technologist sees an average of 41 platelets per field. How would you interpret this? Increased
When would a tech choose to count 200 WBCs for a differential instead of the normal 100? If the WBC count is greater than 40.0x10^9/L
The instrument reports a total WBC of 133.8 x 10^3/uL but unable to read the % of the various WBCs due to the high WBC count. Perform a manual diff and find 13% segs, 74% lymphs, 8% monos, 2% eos, and 3% basophils. What is the absolute neutrophil count? 17.4 x 10^3/uL
The instrument reports a total WBC of 133.8 x 10^3/uL but unable to read the % of the various WBCs due to the high WBC count. Perform a manual diff and find 13% segs, 74% lymphs, 8% monos, 2% eos, and 3% bas. What is the absolute monocyte count? 10.7 x 10^3/uL
What percentage of red cells are destroyed and replaced daily in a normal adult? 1%
The best definition of anemia is: A decrease in the oxygen carrying capacity of the blood
What lab results would suggest anisocytosis? RDW= 18.0
What lab results would suggest a decreased red blood cell count? HCT= 30
The presence of bluish red blood cells is termed: polychromasia
Renal disease causes a: normocytic, normochromic anemia
Iron deficiency causes a: microcytic, hypochromic anemia
Sideroblastic anemia causes a: microcytic, hypochromic anemia
Manual cell counting methods in automated hematology laboratories are used for all of the following: very low counts, malfunctioning automated instruments, and counting spinal fluids does NOT include: routine testing
In performing a manual RBC count, the tech counts an average of 8 red blood cells. The specimen was undiluted. What is the RBC count for this specimen? 400 RBCs/uL 8/5 x 0.004= 8/.02
In performing a manual WBC count, the tech counts 155 WBCs on one side and 151 WBCs on the other. The specimen was diluted 1:10. What is the WBC count for this specimen? 3825 WBCs/uL ((155+151)/2) x 10 / 4 x 0.1
In performing a manual WBC count, the tech counts an average of 16 WBCs. The specimen was counted undiluted. What is the WBC count for this specimen? 40 WBCs/uL
Twenty cells are counted in one of the nine large squares of a hemocytometer. The sample is diluted 1:10. How many cells are present per mL? 2,000
On a standard reticulocyte preparation with new methylene blue, there are 100 cells counted with blue-stained granulofilamentous material. The red blood count is 3.22 x 10^9/uL and the hematocrit is 30%. Calculate the reticulocyte count as a percent. 100 retics/ 1000 RBCs = 1/10= 10%
What is a good use of the erythrocyte sedimentation rate (ESR)? monitor patients with rheumatoid arthritis
What can cause a falsely increased erythrocyte sedimentation rate (ESR)? tube not totally vertical -this applies to traditional ESRs --westergren --wintrobe --modified wintrobe
How do sickle cells or spherocytes interfere with the erythrocyte sedimentation rate (ESR)? prevent rouleaux formation so falsely decrease
Created by: Megan Hohenberg