Medical Laboratory Technician Exam FREE Medical Laboratory Technician Hematology and Coagulation Questions and Answers 2

Question 1

A patient's CBC reveals an MCV of 110 fL and oval macrocytes on the peripheral smear. Which nutrient deficiency is most likely responsible?

Accepted Answer

Vitamin B12 or folate

Answer

Oval macrocytes with elevated MCV are characteristic of megaloblastic anemia caused by vitamin B12 or folate deficiency.

Question 2

Which coagulation factor is measured exclusively by the prothrombin time (PT) and not the activated partial thromboplastin time (aPTT)?

Accepted Answer

Factor VII

Answer

Factor VII is unique to the extrinsic pathway and is evaluated only by the PT.

Question 3

A D-dimer test is most useful in ruling out which condition?

Accepted Answer

Deep vein thrombosis

Answer

A negative D-dimer has high sensitivity for excluding deep vein thrombosis and pulmonary embolism.

Question 4

What is the expected finding on a peripheral blood smear in a patient with disseminated intravascular coagulation (DIC)?

Accepted Answer

Schistocytes

Answer

Schistocytes (fragmented red blood cells) result from mechanical shearing of RBCs through fibrin strands in DIC.

Question 5

Which anticoagulant is preferred for routine coagulation testing such as PT and aPTT?

Accepted Answer

3.2% sodium citrate

Answer

Sodium citrate at 3.2% concentration is the standard anticoagulant for coagulation studies because it reversibly binds calcium.

Medical Laboratory Technician Exam Practice Test