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Cytologic evaluation

…tes) and at morphologic features. Dysplasia in megakaryocytes could indicate abnormal or accelerated production and may yield clues as to mechanisms underlying a thrombocytopenia. However, the lack of morphologic abnormalities in megakaryocytes does not mean that platelet production is normal. M:E ratio Myeloid and erythroid cells: With myeloid and erythroid precursors, we do the following: 1) Assess for complete and balanced maturation, 2) Cal…

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Color changes

…fer from iron deficiency anemia since they could not access iron in soil (when housed intensively). This is overcome by giving them intramuscular iron injections. Copper deficiency: Copper is required for utilization of iron. Copper is an essential cofactor for the enzymes that allow the release of iron from stores with macrophages and uptake of iron from the gastrointestinal tract. Copper deficiency can manifest as an iron deficiency anemia. Alt…

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Cell morphology

…es in cells is important because these changes can be useful markers of underlying disease or can give clues as to the mechanisms behind cytopenias in peripheral blood. For instance, examination of a blood smear for the presence of polychromasia is a critical component in determining if whether an anemia is regenerative and due to to blood loss or hemolysis. Since animals cannot speak for themselves, we have to let their blood do the talking for…

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RBC indices interpretation

The table below is a quick summary of how changes in the mean cell volume (MCV) and mean cell hemoglobin concentration (MCHC) can guide us as to the mechanism and potential cause of an anemia. How red blood cell indices helps with identifying mechanism and cause of an anemia MCV MCHC Severity Regenerative? Mechanism Potential causes Normocytic Normochromic Mild to moderate No Decreased production Anemia of inflammatory disease (most common;…

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Thrombogram

…e manually using a hemocytometer or with an automated analyzer. Counts can also be estimated during blood smear examination. Since many laboratories use instruments that count platelets, RBC and WBC concurrently, a platelet count is a routinely reported result on complete or automatd hemograms. At Cornell University, all platelet counts from our analyzer are verified by examining a blood smear for platelet clumps (which will falsely lower the cou…

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Respiratory secretions

…trophil percentages in BAL fluid (Tee et al 2012). TW vs BAL The two samples are not synonomous but can provide complimentary information in individual horses, depending on the disease. In general, a TW analysis is preferred for infectious disease diagnosis and antimicrobial testing or monitoring/checking racehorses with poor performance or clinical signs of respiratory disease (in the United Kingdom [Kinnison and Cardwell 2020]) or detection of…

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Sample collection

…, mimicking a true hematuria. Increased protein is not usually seen with a microscopic hematuria (but may not accompany a true hematuria either). Anticoagulant A sterile container is preferred for urine collection. Culture can be performed on such samples as long as it is maintained and handled in a sterile manner. Glass non-anticoagulant (red top) tubes can be used for storing urine, however plastic (red top) tubes are not recommended, because…

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Other WBC changes

…ils in blood, including parasites (see the infectious agent page or the infectious agent gallery). Hemosiderin and hematoidin: Hemosiderin can be seen in neutrophils and monocytes in animals with hemolytic anemia, usually with an intravascular component. Presumably, the free hemoglobin is taken up by scavenger receptors (e.g. CD163, the haptoglobin receptor on monocytes) and the porphyrin ring is converted to unconjugated bilirubin, which is the…

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Indications/Methods

Indications Indications for bone marrow sampling include: Evaluation of persistent or unexplained abnormalities in peripheral blood, including: Pancytopenia (anemia, usually non-regenerative, neutropenia, thrombocytopenia) Unexplained, persistent, nonregenerative anemia Unexplained, persistent, thrombocytopenia Unexplained, persistent, marked neutrophilia and/or monocytosis Unexplained, persistent, moderate to marked monocytosis Unexplained, p…

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Mycoplasma

Canine Mycoplasma haemocanis (formerly Haemobartonella canis) rarely causes anemia in dogs with normal spleens and normal immune systems. Clinical anemia can develop when a carrier dog is splenectomized or when a splenectomized dog is transfused with blood from a carrier donor. M. haemocanis may be a widespread latent infection in kennel-raised dogs. These dogs are commonly used for research worldwide and the potential exists for such chronic i…

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