Exam 14: Manual, Semiautomated and Point-of-Care Testing in Hematology

A manual WBC count is performed using a system that makes a 1:20 dilution of blood.When the cells in the four large corner mm² of the hemocytometer are counted,the following numbers of cells are obtained: 8,12,9,and 11.What would be the next step?

Which of the following red cell indices supports normocytic normochromic red cell morphology? 120 36 35 68 22 28 90 30 34 75 30 34

On a standard reticulocyte preparation with new methylene blue,100 of 1000 cells that are counted contain blue-stained granulofilamentous material.The red blood count is 3.22 × 10¹²/L,and the hematocrit is 30%.Calculate the MCV.

On a standard reticulocyte preparation with new methylene blue,100 of 1000 cells that are counted contain blue-stained granulofilamentous material.The red blood count is 3.22 × 10¹²/L,and the hematocrit is 30%.Calculate the corrected reticulocyte count.

A manual hemoglobin is determined on a patient,and the dilution still appears turbid after letting it sit for 15 minutes.The stained blood film is examined,and sickle cells are observed on the blood film.Equal volumes of the diluted hemoglobin sample and water are mixed together,and the absorbance of this read on a spectrophotometer.How should the hemoglobin result be determined from the standard calibrated graph?

Interpret the following results (all tests performed manually)on an adult female named Mary Jones. RBC: 3.22 x 10¹²/L Hemoglobin: 16.0 g/dL Hematocrit: 30.0%

What causes the RBCs to settle faster through the plasma when inflammation or infection is present?

Ten nucleated red blood cells (NRBCs)are found in a blood film when differentiating 100 white cells.What is the corrected white blood count if the automated cell counter printed a count of 10.0 x 10⁹/L?

Which of the following could cause the microhematocrit to be falsely decreased?

On a standard reticulocyte preparation with new methylene blue,100 of 1000 total cells that are counted contain blue-stained granulofilamentous material.The red blood count is 3.22 x 10¹²/L,and the hematocrit is 30%.Calculate the reticulocyte count as a percentage.