Exam 37: Hematology Procedures

Proper technique for the capillary puncture includes:

An elevated potassium in a hemolyzed specimen is classified as:

What is the screening test of choice in the workup of PNH?

List corrective measurements for each of the following: a.A good monolayer on a blood smear in a patient with a low hematocrit b.A good monolayer on a blood smear in a patient with a high hematocrit c.Platelet satellitism d.Many smudge cells on PB smear

The following erythrocyte indices were determined as part of a CBC: MCV 84 fL,MCH 24 pg,and MCHC 30 g/dL.What would you expect to observe on the Wright-stained peripheral blood smear?

The following are preliminary screening test results.Name the suspected disorder associated with each finding,and explain how you would confirm each. a.Positive sugar-water test b.Positive hemolysis after both incubation periods c.Normal sTFR levels d.Many spherocytes noted on PB smear e.Blasts noted on PB smear

Increased levels of Heinz bodies are seen in which of the following?

An instrument printout reports a WBC count of 12 × 10⁹/L.The technologist reviews the peripheral blood smear and counts 45 nucleated RBCs.What is the best course of action regarding these findings?

The reference interval for hemoglobin varies with age.Which of the following age groups is associated with the highest hemoglobin level?

Which of the following is the most appropriate test to differentiate hemoglobin S trait from hemoglobin S disease?

Given an RBC count of 3.25 × 10¹²/L,a hemoglobin of 9.0 g/dL,and a hematocrit of 25%,how will the red cells appear under PB smear examination?

A CBC is performed on a polycythemic patient.What must the laboratician do to ensure that this specimen has an optimal blood smear?

A sickle solubility test is requested STAT on a 45-year-old patient who is to have surgery very soon.The technologist receives the sample and immediately takes out the reagent from the refrigerator and performs the test.It comes back positive.The surgery is postponed until hemoglobin electrophoresis is performed,and it shows a normal distribution of adult hemoglobins.What is the most likely reason for the discrepant result?

The resolution of a microscope is a function of:

Acid is used in the quantification of hemoglobin F laboratory test because:

A patient has difficult veins,and a winged infusion set is used to collect the blood from a small vein in the patient's hand.After successfully filling all the SST tubes,the phlebotomist proceeds to fill the light blue-top tube but is unsuccessful.She changes tubes,thinking that it might be a tube with a lost vacuum,but there is still no blood flow.She inspects the entry site and notices some bruising around it that was not present before.Discuss possibilities of the unsuccessful draw,and explain how to correct them.

The acid elution test for hemoglobin F was performed on a patient sample,and examination of the slide revealed an uneven distribution of hemoglobin F within the erythrocytes.Control slides were acceptable.Which of the following is associated with this observation?

Which cytochemical stain is useful in differentiating myeloblasts and lymphoblasts?

How does the anticoagulant EDTA prevent coagulation from occurring?

A panel of cytochemical stains is performed to determine a patient's subtype of AML.Myeloperoxidase and Sudan Black B are positive.Specific esterase is positive and nonspecific esterase o is negative.Based on this information,what lineage is implicated as the chosen subtype of AML?