Medical Laboratory Technician Exam FREE Medical Laboratory Technician Hematology and Coagulation Questions and Answers 3

Question 1

In a patient with suspected heparin-induced thrombocytopenia (HIT), which laboratory finding supports the diagnosis?

Accepted Answer

Positive serotonin release assay

Answer

Elevated fibrinogen level

Answer

Decreased D-dimer

Answer

Prolonged thrombin time only

Question 2

Which hemoglobin electrophoresis pattern is characteristic of sickle cell trait (HbAS)?

Accepted Answer

HbA greater than HbS with normal HbA2

Answer

HbS greater than HbA with elevated HbF

Answer

HbS only with no HbA

Answer

HbC greater than HbA

Question 3

A mixing study corrects a prolonged aPTT. What does this result indicate?

Accepted Answer

Factor deficiency

Answer

Presence of a lupus anticoagulant

Answer

Heparin contamination

Answer

Factor inhibitor

Question 4

Which cell type is the primary precursor of platelets in the bone marrow?

Accepted Answer

Megakaryocyte

Answer

Myeloblast

Answer

Reticulocyte

Answer

Promonocyte

Question 5

An INR of 4.5 in a patient on warfarin therapy indicates which of the following?

Accepted Answer

Excessive anticoagulation requiring dose adjustment

Answer

Therapeutic anticoagulation for mechanical heart valve

Answer

Subtherapeutic anticoagulation

Answer

Normal coagulation status

Question 6

What is the principle behind the erythrocyte sedimentation rate (ESR) test?

Accepted Answer

Measuring the rate at which RBCs settle in anticoagulated blood over one hour

Answer

Counting the number of reticulocytes per volume of blood

Answer

Determining oxygen-carrying capacity of hemoglobin

Answer

Assessing RBC deformability through a filter