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Bioanalytical Pathology Exam 1

Michelle Evans Veterinary Medicine GRE Inglés 167 fichas

Bioanalytical Pathology Exam 1

Fichas del conjunto (167)

  1. 1What tube do you use for a serum chemistry panel?A red top tube
  2. 2Does a red top tube contain anticoagulant?No; want the blood to clot so that you can separate the serum and run a biochemistry panel
  3. 3What is the purpose of a tiger-top (red/grey) tube?Also for serum biochemistry; separates the blood and the serum within the same tube (same tests as red top tube)
  4. 4Which tube contains the anticoagulant EDTA with potassium salt? What is the purpose of EDTA?Lavender top tubes
    Used to collect blood for CBC, fluids
    EDTA chelates Ca2+ and prevents coagulation in the tube (preserves cell morphology)
  5. 5Which tube is used for coagulation testing?Blue top tube
  6. 6What additives does the blue top tube contain? What is their purpose?Contains anticoagulatnt sodium citrate
    Weakly chelates Ca2+
    Then add calcium back to see how clotting precedes
  7. 7What is a common mistake when filling a blue top tube?Not using the precise volume of blood; need a 9:1 ratio of blood to citrate
    Under fill tube, get too much anticoagulant
    Will use up all the Ca2+ and invalidate the test
  8. 8Which tube is used for glucose collection, if the sample is going to ship and can't be spun?Grey top tube
  9. 9What additives are in the grey top tube? What are their purpose?Sodium fluoride
    Inhibits glucose metabolism in cells so that you can determine the glucose concentration in the cells
  10. 10What is the purpose a green top tube?Use in large animal, avian, and reptile serum biochemistry
    Other specific tests like lead concentration, blood gas panels
  11. 11What additives are in the green top tube? What are their purposes?Contains the anticoagulant heparin
    Prevents thrombin from promoting fibrin formation
  12. 12Why shouldn't you refrigerate a blood film or freeze a blood sample?Will get cell lysis
    Artificially low PCV, high Hgb
  13. 13You see a sample with very swollen red blood cells and degraded leukocytes. What error was made to leave to these changes?Left the sample sitting at room temperature for 24 hours or more
  14. 14If you under fill a lavender top tube, what changes in CBC results?Will have decreased PCV and MCV due to erythrocyte shrinkage
  15. 15You have a sample that is taking an extremely long time to clot. Assuming the animal does not have a clotting disorder, what could explain these results?Too little blood was added to the blue top tube, and the sodium citrate ate the Ca2+ that was added back into the tube to initiate coagulation
  16. 16What is packed cell volume (PCV)?The percentage of whole blood that is composed of erythrocytes
    Measured after centrifugation to maximally pack RBC
  17. 17What is the purpose of plasma protein refractometry?Estimates the protein concentration in plasma (assuming that other solutes are present in their normal concentration)
  18. 18What factors can alter the results of protein concentration estimate?Lipemia and severe hemolysis
  19. 19What does an increase in blood albumin indicate?Dehydration; not due to increased production in albumin
  20. 20Increased PCV and increased TP indicate:Dehydration
  21. 21Decreased PCV and decreased TP indicate:Blood loss
  22. 22PCV is WNL, TP is decreased:Decreased protein production, increased protein loss
  23. 23PCV is WNL, TP is increased:Increased globulin production, dehydration in an anemic patient
  24. 24PCV decreased, TP is WNL:Anemia of chronic disease or hemolysis
  25. 25PCV increased, TP is WNLDehydration in an animal with low TP or polycythemia (increased cell production)
  26. 26Which is more useful: the percentage of nucleated cells that belong to each cell type, or the absolute concentration of each cell type?The absolute concentration
    The percentage can be WNL, but if we have lost all the cells the percentage isn't useful to us (won't reflect this loss)
  27. 27What is the best technique for blood film preparation?"Push" technique
    Use two slides; increase angle if animal is anemic; push quickly to get a thin film across the slide
  28. 28Which area of the blood film do you examine to find large items, such as microfilariae and aggregated platelets?The feathered edge
    Large objects will be pushed here as the slide is prepared
  29. 29What determines if an anemia is regenerative?The presence of reticulocytes
    (young, immature erythrocytes that still contain some RNA from organelles); visualized with methylene blue stain
  30. 30Which species never release reticulocytes in response to anemia?Horses
    Anemia may be regenerative, but will not see reticulocytes in the peripheral blood
  31. 31In cats, which form of reticulocytes are important for determining if regeneration is ongoing?The aggregate form
    Aggregate forms mature in about 12 hrs, then the punctate take weeks to mature; only aggregate reticulocytes indicate an ongoing regeneration
  32. 32What is the buffy coat?The white band on a centrifuged sample between the serum and the RBC
    Contains leukocytes, nucleated erythrocytes, platelets
  33. 33What does yellow pigmented serum indicate?This serum is icteric
    Indicated that there is increased bilirubin (icterus) or may just be carotene in large animals (pigment from food)
  34. 34What does white opaque plasma indicate?This plasma is lipemic; there are increased chylomicrons in the plasma
    Can be due to a postprandial collection, or due to diseases with abnormalities in lipid metabolism
  35. 35What does red plasma indicate?Hemolysis
    Can be in vitro or in vivo
    If PCV not decreased, probably in vitro (consider it an artifact)
    If in vivo = hemolytic anemia
  36. 36What are the components of a CBC?Leukogram, Eyrthrogram, Thrombogram, Total Protein
  37. 37What parameters are included in the erythrogram?RBC count, PCV, [Hgb], RBC parameters (MCV, MCHC, RDW), RBC morphology
    +/- reticulocyte count
  38. 38Which parameters are directly measured?Nucleated cell count, RBC count, Hgb, MCV, Platelet count, MPV, plasma protein, fibrinogen
  39. 39Which parameters are determined via microscope examination?Differential nucleated cell count; morphology of RBC, WBC, platelets; reticulocyte enumeration
  40. 40What parameters in a CBC are calculated?Absolute [WBC], hematocrit, RDW
  41. 41A decrease in which parameters indicates anemia?RCB, Hct, PCV, Hgb
  42. 42What does an increased in mean cell volume (MCV) indicate?Macrocytosis
    Can be due to a regenerative response to anemia (polychromatophils are larger than mature RBC)
  43. 43In a cat with macrocytosis (increased MCV) and a non-regenerative anemia, what disease do you consider as a top differential diagnosis?FeLV
  44. 44What does a decreased MCV indicate?Microcytosis
    Iron deficiency or portosystemic shunt
    Can be seen in a chronic inflammatory response when macrophages sequester iron
  45. 45What is the MCHC?The mean cell hemoglobin concentration , or the average amount of hemoglobin in a RBC
  46. 46What does an increased MCHC indicate?Hemolysis (more Hgb in the blood, get an increased calculation)
    Never hyperchromic
    Cannot get increased Hgb in a RBC
  47. 47What does a decreased MCHC indicate?Decreased MCHC = hypochromia
    Indicates cell swelling
    Dilutes the Hgb as the volume increases, [Hgb] remains the same
  48. 48What is the RDW? What does an increase in this parameter indicate?Red cell distribution width; tells you the variation in size of red blood cells
    Increased RDW indicates a high degree of anisocytosis; variable RBC size
  49. 49What information does the reticulocyte count give you?Tells you whether or not an anemia is regenerative
  50. 50What does an increase in the reticulocyte count indicate?A regenerative anemia
    The bone marrow is producing many new RBC to try and make up for the deficit
  51. 51What does a decreased reticulocyte count, or a reticulocyte count that is not increased in an anemic animal, indicate?That red blood cells are not regenerating
    A non-regenerative anemia can be due to issues in the bone marrow
  52. 52What is a hypochromic RBC?A red blood cell with decreased [Hgb], appears to have less color and a larger central pallor
  53. 53What CBC parameter confirms whether an anemia is hypochromic or normocrhomic?MCHC
    The color of the RBC is determined by the [Hgb]
  54. 54What is anisocytosis?Variation in cell size
  55. 55What CBC parameter determines the degree of anisocytosis?RDW
  56. 56What is poikilocytosis?Variation in cell shape
  57. 57What are these cells?EchinocytesWhat are these cells?
  58. 58What are echinocytes?Crenated cells; dehydrated RBC that have the same amount of membrane but decreased volume
    Most common shape change (usually artifact); can be caused by severe electrolyte imbalances, uremia
  59. 59Rattlesnake envenomation is associated with what shape change in RBC?Type III Echinocytes
    Very fine spikes
  60. 60What is this RBC shape called?AcanthocyteWhat is this RBC shape called?
  61. 61What disease process is associated with the presence of acanthocytes?Hemangiosarcoma
    Any microangiopathic process that creates newly formed vessels for RBC to travel through
  62. 62Keratocytes are indicative of which kinds of processes?Oxidative Injury
    Iron deficiency
  63. 63What is the term for these kinds of cells?Keratocytes
    Have a vacuole that forms in the RBC; breaks open and creates a horn-like projection    What is the term for these kinds of cells?
  64. 64What are schistocytes? What are they caused by?RBC fragments
    Likely due to shearing in intravascular trauma
    DIC; microangiopathic disorders; iron deficiency
  65. 65What are spherocytes pathognomonic for?Immune-mediated processes such as immune-mediated hemolytic anemia
    Shape change is caused by membrane damage due to attack by immune system
  66. 66What are these cells?Spherocytes
    RBC with membrane damage that ball up; no longer a biconcave disc; no area of central pallor    What are these cells?
  67. 67What are these cells?Eccentrocytes
    Hgb is eccentrically placed within the cell; it fuses with the erythrocyte membrane    What are these cells?
  68. 68What process causes eccentrocytes?Oxidative damage, either from toxins or endogenous issues
  69. 69What processes can lead to increased nucleated red blood cells (nRBC) in the peripheral blood?Splenectomy (nucleus can be removed in spleen, no spleen --> no removal)
    Regeneration (with polychromasia)
    Lead poisoning
    Bone marrow injury
    FeLV, erytholeukemia
  70. 70You see nRBC with no significant polychromasia -- what disease processes are you concerned about?FeLV or erythroleukemia
  71. 71What is a Howell-Jolly body?Small nuclear remnant
    Appears as a small, dark purple spot in a low number of erythrocytes
  72. 72What is cellular feature is often seen in ruminant regenerative responses?Basophilic stippling
  73. 73If you see basophilic stippling with few other signs of regeneration, or without anemia, what should you worry about?Lead poisoning
  74. 74How do you distinguish intracellular bacteria, like Anaplasma, from Howell-Jolly bodies?Bacteria will be present in many more RBC; Howell-Jolly bodies occur only occasionally.
  75. 75Mycoplasma is important in which domestic species?Cats
  76. 76A large, tear-shaped inclusion in a canine RBC is indicative of which intracellular parasite?Babesia
  77. 77What are Heinz bodies?Denatured Hgb due to oxidative injury
    Form most easily in cats
    May or may not protrude from the erythrocyte
  78. 78What stain can be used to determine if Heinz bodies are present?Use a reticulocyte stain, can be easily visualized
  79. 79What causes agglutination?Cells will arrange in grape-like clusters due to antibody bridging
    Some kind of immune-mediate process
  80. 80What is anemia?Decrease in RBC mass
    Results in decreased tissue oxygenation
  81. 81What parameters are used to assess anemia?PCV, Hgb, [RBC]
    Values should all change together since they basically measure the same thing (if not, there is an error in the analysis)
  82. 82What are the three causes of anemia?RBCs are being lost (hemorrhage)
    RBCs are being destroyed
    RBCs aren't being made
  83. 83If regeneration is present, what are the possible causes of the anemia?Blood loss or destruction of RBC
  84. 84If no regeneration is present, what do you know about the anemia?Either that the bone marrow is not producing RBC like it should, or that reticulocytes are being destroyed in the marrow before they are released.
    May also have caught the anemia early, before regeneration starts.
  85. 85If plasma protein is decreased in the presence of anemia, what is the most likely cause of anemia?Blood loss or hemorrhage
    Plasma proteins and RBC will be lost in the blood
  86. 86What does macrocytosis indicate in anemia?May indicate a regenerative response (retiuclocytes and other young RBC are larger than mature RBCs)
    If no reticulocytes present, may indicate FeLV or another myeloproliferative disorder.
  87. 87What does hypochromasia indicate?Often seen with regenerative anemia, since reticulocytes are still obtaining Hgb
    Can be seen with iron deficiency (if RBCs are microcytic)
  88. 88What signs found during a physical exam can be indicative of anemia due to blood loss?Bruising, petechia (can be platelet dysfunction or coagulation disorder)
    Abdominal distension (internal bleeding)
  89. 89What sign found during a physical exam can be indicative of anemia due to hemolysis?Icteric mucous membranes
  90. 90If the bone marrow is responding to an anemia and regenerating RBCs, what should the reticulocyte be?Above average
    Production needs to increase in order to keep up with the decreased [RBC]
  91. 91A macrocytic, non-regenerative anemia is indicative of which disease processes?FeLV
    Myeloproliferative disorders
  92. 92What is pancytopenia?Aplastic anemia -- lack of any regeneration.
    Decrease in all cell lines
    Caused by stem cell injury or suppression.
  93. 93What can cause pancytopenia?Drugs (chemotherapeutic agents, estrogens)
    Toxins
    Infectious agents (FeLV, Erlichia canis, Equine infectious anemia, parvo)
  94. 94In pancytopenia, which cell lines will decrease first?Neutrophils and platelets (lifespan hours to days); RBC can live for months, won't see a decrease for a bit
  95. 95What is pure red blood cell aplasia?Severe anemia due to lack of erythroid precursors without decreased neutrophils or platelets
    Can be immune-mediated destruction of erythroid precursors or FeLV
  96. 96What is RBC hypoplasia?Decreased RBC production due to external influences -- most common cause of non-regenerative anemia
    Can be inflammatory disease, renal failure, or endocrine diseases
  97. 97Does chronic inflammatory disease cause regenerative or non-regenerative anemia?Non-regenerative
  98. 98What is the mechanism of anemia due to inflammatory disease?Cytokine production causes decreased production of RBC
    Cytokines cause iron sequestration, leaving less available for erythroid production
  99. 99Why is anemia common in animals with renal failure?Erythropoietin comes from the kidney and is essential for RBC production; without EPO, will get decreased RBC production
  100. 100How do endocrine diseases cause non-regenerative anemia?Related to altered metabolism, trophic factors
    See with hypothyroidism and hyperadrenocorticism
  101. 101Non-regenerative anemia with neutrophilia, left shift, and monocytosis is most likely caused by:Chronic inflammation
  102. 102What are some causes of pancytopenia?Stem cell injury
    Myelophtistic disease (neoplastic cells crowding in the bone marrow)
    Hemophagocytic syndrome (macrophages eat the precursors)
  103. 103If you have a non-regenerative anemia with azotemia (increased BUN, creatinine), the most likely cause of anemia is:Renal failure
  104. 104What is the benefit of looking at the bone marrow (via aspirate or core biopsy) during non-regenrative anemia?Can assess if erythroid precursors are present and if there is evidence of regeneration
  105. 105If a bone marrow aspiration shows dysplatic maturation of RBC, the most likely cause of anemia is:FeLV
    Myeloproliferative disease
  106. 106If a bone marrow aspiration shows precursors present in high numbers, but there are no signs of regeneration in the peripheral blood, the anemia is most likely due to:Immune mediated destruction of precursors in bone marrow
  107. 107In what species can you not use iron stores in the bone marrow to determine if anemia is due to chronic inflammation?Cats -- don't store iron in bone marrow
  108. 108What is regenerative anemia?An anemia where the bone marrow is still producing erythroid precursors, trying to combat the anemia by releasing more RBCs
  109. 109What are causes of regenerative anemia?Blood loss
    Erythrocyte destruction
    Recovery fro reversible bone marrow dysfunction or stem cell injury
  110. 110If you see regenerative anemia with low protein concentration, the top differential for the anemia is:Blood loss
  111. 111In acute blood loss, what signs are seen?If very acute, PCV and protein may be normal.
    Later, interstitial fluid moves into vessels to maintain blood volume, get decreased concentrations of erythrocytes and protein.
    May take awhile to see regeneration
  112. 112Chronic blood loss should lead to:Strongly regenerative anemia
    May result in iron deficiency if blood is loss form the body
  113. 113What are the causes of chronic blood loss anemia?Blood sucking parasites
    GI ulcers and neoplasms
    IBD
    Intermittent bleeding due to thrombocytopenia, inherited coagulopathy, bleeding tumor
  114. 114What is the most common site associated with chronic blood loss?GI system
  115. 115What are the signs of iron deficiency?Microcytosis
    MCV decreased
    RDW increased
    MCHC normal or decreased
    Blood film examination (increased central pallor, keratocytes/schistocytes)
    Thrombocytosis
  116. 116What are is main causes of blood cell destruction?Immune system either directly attacking RBC or other immune complexes that attach to RBC
    Infection, vaccination, neoplasia, drug toxicities, autoimmune disease
  117. 117Destruction of RBC leads to what kind of anemia?Regenerative
  118. 118What is the mechanism for intravascular hemolysis?Occurs through complement fixation and the membrane attack complex
    Hgb leaks from RBC --> ghost cells
    MCHC increased due to free Hgb in plasma
  119. 119What is the mechanism for extravascular hemolysis?Macrophages in liver, spleen, bone marrow phagocytize erythrocytes
  120. 120What are signs are pathognomonic for IMHA?Spherocytes
    Agglutination
  121. 121What is the mechanism of IMHA?Antibodies attach to RBC membrane
    Macrophages recognize this
    Phagocytize and destroy RBC
  122. 122What is a Coomb's test?Test for IMHA
    Create antibodies to the auto-antibodies found in IMHA
    If a patient has these auto-antibodies, the test will result in agglutination
  123. 123What is neonatal isoerythrolysis?Immune-mediated destruction of erythrocytes in newborns
    Maternal antibodies attacking offspring's RBC
  124. 124How do baby's obtain maternal antibodies in neonatal isoerythrolysis?In colostrum
    If you prevent the baby from nursing for 24 hrs, or give it colostrum from another mare, can prevent transfer of antibodies
  125. 125Why is neonatal isoerythrolysis common in mule foals?Donkeys have antigen that horses don't on their RBC; if baby gets mare colostrum, will get RBC lysis
  126. 126How do you diagnose infectious causes of anemia?PCR
    Blood film
  127. 127Are Mycoplasma intracellular or extracellular bacteria?Extracellular
    Adhere loosely to RBC membrane
    Can fall of erythrocytes and be seen in plasma
  128. 128What is an infectious cause of acute hemolytic anemia in cats?Mycoplasma haemofelis
  129. 129Why are splenectomized dogs more likely to get disease from Mycoplasma haemocanis?Normally the spleen is very effective at removing the bacteria from the RBC; without a spleen, will get many more bacteria in the blood
  130. 130What is an infectious cause of severe hemolytic anemia in cattle?Anaplasma marginale
  131. 131Is Anaplasma intracellular or extracellular?Intracellular
    Lives within the RBC
  132. 132What is the mostly likely cause of a tear-shaped intraerythrocytic organism visualized on a canine blood smear?Babesia
  133. 133What does Babesia cause in horses?Piroplasmosis
  134. 134What is a protozoal cause of hemolytic anemia in ruminants?Theileria
  135. 135What is a protozoal cause of hemolytic anemia in cats?Cytauxzoon felis
  136. 136A cat presents with hemolytic, nonregenerative anemia, keuopenia, thrombocytopenia, and organisms visible within the RBC and macrophages. What is the most likely cause?Cytauxzoon felis
  137. 137What is a consequence of macrophages phagocytizing Cytauxzoon felis?Build up macrophages in bone marrow and blood vessels
    Get vessel damage and thrombosis
  138. 138What species is most likely to get Heinz body anemia? Why?Cats
    Have a hemoglobin structure that is more susceptible to oxidation
  139. 139What is the cause of Heinz body anemia?Oxidative damage to hemoglobin
  140. 140Why do animals with Heinz body occasionally have elevated MCHC?Heinz bodies interfere with measurement of hemoglobin
  141. 141How doe water intoxication lead to hemolytic anemia?After period of severe dehydration, RBC will be hyperosmolar
    Give unlimited water, water moves into hyperosmolar cells --> swelling, lysis
  142. 142What is polycythemia?Increase in erythrocyte mass
  143. 143What are relative causes of polycythemia?Dehydration
    (Concentrates RBC and protein)
    Splenic contraction
    (Common in horses and cats; release of sequestered RBC into circulation for short period of time)
  144. 144What is absolute polycythemia?Total erythrocyte mass is actually increased
  145. 145What is relative polycythemia?RBC mass is not truly increased; either transient increase in amount in circulation, or just concentrated due to dehydration.
  146. 146What is primary absolute polycythemia?Uncontrolled production of erythrocytes
  147. 147What myeloproliferative disorder describes a chronic leukemia of erythroctes?Polycythemia vera
  148. 148What is secondary primary polycythemia?Bone marrow is increasing production of RBC in response to elevated erythropoietin
  149. 149What is appropriate secondary polycythemia?Chronic lung or heart disease causes hypoxia that is detected by kidney
    Kidney released EPO in response to hypoxia to increase RBC in circulation (bring more oxygen to tissues)
  150. 150What is inappropriate polycythemia?A tumor in the kidney causes an area of local hypoxia, causing a release in EPO
    Don't actually need more RBC; not a systemic hypoxia.
  151. 151What is MPV? Why can this value be clinically significant?Mean Platelet Value
    If increased, probably regenerating platelets (bone marrow releasing larger precursors in response to thrombocytopenia)
  152. 152What is thrombocytopenia?Platelet count less than reference interval
  153. 153When you see thrombocytopenia without clinical signs, is the most likely cause something pathologic in the animal?No
    Look for clots in the tubes, platelet clumps on blood smear
  154. 154Causes of ThrombocytopeniaPlatelets being consumed (DIC, vasculitis, hemangiosarcoma)
    Platelets being destroyed (IMHA, Erhlichia)
    Platelets aren't being made (Bone marrow toxicity, stem cell injury)
  155. 155An animal presents with severe hemorrhage and bleeding. Do you worry about thrombocytopenia with this patient?No; blood loss rarely leads to thrombocytopenia
    If present with blood loss, usually thrombocytopenia first and hemorrhage second
  156. 156What are the indications for bone marrow aspiration?Unexplained cytopenia (neutropenia, non-regenerative anemia, thrombocytopenia, pancytopenia), abnormal cell mrophologies (WBC blasts, dacrocytosis of RBC), abnormal cell population (excessive nRBCs), diagnosing, staging, and monitoring neoplasia, PE finding (fever unknown origin, lytic bone lesions)
  157. 157What type of anemia is an indication for a bone marrow aspirate?Non-regenerative Anemia
    With no signs of inflammation, chronic renal failure, or endocrine disease
  158. 158What is the advantage of a bone marrow aspirate?Better ID and evaluation of individual cell morphology
    Faster turn around (no special stain)
  159. 159What are the advantages of core biopsy?More accurate for determining true cellularity of bone
    Better at discerning fibrosis, amyloidosis
    May be more sensitive to detecting infiltrative disorders
  160. 160Why should you stop aspirating as soon as the bone marrow sample starts entering the syringe?Don't want to get hemodilution of the sample
    Will just begin getting blood, no more cells; artificially dilutes your sample
  161. 161True or false: Bone marrow aspiration is a useful diagnosis tool without any other tests.False; need a CBC to understand findings.
    Everything is relative, interpretation is based on abnormalities in peripheral blood
  162. 162What is the M:E ratio?The ratio of myeloid and erythroid cells in a bone marrow aspirate or core biopsy
  163. 163What is an increased M:E ratio?More myeloid cells than erythroid cells
    Either myeloid cells are being produced excessively, or erythroid cells are not being produced enough
  164. 164What is a decreased M:E ratio?More erythroid cells than myeloid cells
    Either more erythroid cells being produced, or not enough erythroid cells being produced
  165. 165If an anemia is due to a lack of production, what would you expect to see in the bone marrow?You would expect the bone marrow to be hypoplastic, since a lack of production indicates that not enough RBC are being produced
  166. 166If a cytopenia is caused by consumption, what do you expect to see in the bone marrow?Expect the bone marrow to be hyperplastic, trying to replace the cells that are being consumed
  167. 167If a cytopenia is due to destruction, what do you expect to see in the bone marrow?Expect the bone marrow to be hyperplastic (replacing the cells that are being destroyed) unless the precursors are being attacked in the bone marrow.

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Descripción
Hematology, Anemia, Bone Marrow Aspiration
Creado por
Michelle Evans
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