Free Medical Laboratory Technician MCQ Questions and Answers

Question 1

The amount to which a procedure deviates from a calculated mean value or a known value is referred to as

Accepted Answer

Standard deviation

Answer

Standard deviation is a statistical measure that quantifies the amount of variation or dispersion of a set of data values. It indicates how much individual data points typically deviate from the mean (average) value. In laboratory quality control, standard deviation is crucial for assessing the precision and reproducibility of a procedure.

Question 2

The majority of plasma thyroxine (T4) is

Accepted Answer

Bound to globulin

Answer

The majority of thyroxine (T4) in plasma is transported bound to plasma proteins, primarily thyroid-binding globulin (TBG). While a small fraction is also bound to albumin and transthyretin, TBG has the highest affinity and capacity for T4. Only a very small percentage of T4 circulates as free hormone, which is the biologically active form.

Question 3

For a qualitative VDRL test, inactivated serum is used in a quantity of

Accepted Answer

0.05 mL

Answer

For a qualitative VDRL (Venereal Disease Research Laboratory) test, a specific quantity of inactivated serum is required for accurate results. The standard volume used for this test is 0.05 mL. This precise measurement ensures the correct antigen-antibody ratio for flocculation to occur, allowing for the detection of reagin antibodies associated with syphilis.

Question 4

A distribution on one side of the mean of six or more consecutive daily values that maintain a constant level is referred to as a distribution.

Accepted Answer

Shift

Answer

In quality control, a 'shift' refers to a sudden and sustained change in the mean of a quality control material, where six or more consecutive daily values fall on one side of the established mean. This indicates a systematic error in the analytical process, such as a calibration issue or a change in reagent lot. It requires immediate investigation and corrective action to restore accuracy.

Question 5

Some automated blood cell counters' operating principle is based on the

Accepted Answer

Size of the particle being counted

Answer

Many automated blood cell counters operate on the principle of impedance, which measures changes in electrical resistance as cells pass through an aperture. As a cell passes, it displaces a volume of electrolyte, causing a momentary change in resistance proportional to the cell's size. This allows the instrument to count and size individual cells, such as red blood cells, white blood cells, and platelets.

Medical Laboratory Technician Exam Practice Test

Medical Laboratory Technician Exam Practice Test

Free Medical Laboratory Technician MCQ Questions and Answers