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Chapter 1: Introduction to Hematology and Basic Laboratory Practice
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ ; Tube length when referring to the microscope is the:
| a. | Resolution power of the objective |
| b. | Distance from the eyepiece to the objective |
| c. | Numerical aperture |
| d. | Magnitude of the image on the stage |
____ ; What is the most useful corrective action for the microscope when fine details cannot be visualized in immature cells?
| a. | Open up diaphragm for maximum light. |
| b. | Wipe off lenses with lens cleaner. |
| c. | Get a new slide. |
| d. | Move to a lower power. |
____ ; Which of the following behaviors is a violation of standard precautions?
| a. | Handwashing after glove removal |
| b. | Use of impermeable laboratory gowns |
| c. | Use of goggles and face shields |
| d. | Placing laboratory notebooks on laboratory work area |
____ ; Standards and calibrators differ from control materials because:
| a. | An exact amount of analyte is present in a standard or calibrator |
| b. | A variable amount of analyte is present depending on patient samples |
| c. | Standards only need to be within a target range |
| d. | Standards are run to the best estimate of the known value |
____ ; If the confidence interval for most laboratories is , what is the acceptable range for hemoglobin if a hemoglobin control was run with a mean of and a standard deviation of
| a. | to |
| b. | to |
| c. | to |
| d. | to |
____ ; Proper mixing of samples and timely delivery of samples to the laboratory are both examples of:
| a. | Delta checks |
| b. | Postanalytic variables |
| c. | Preanalytic variables |
| d. | Reflex testing |
____ ; A delta check is a historical reference on samples run in the laboratories. Once a sample fails a delta check, the most obvious corrective action is to:
| a. | Verify the identification of the patient sample |
| b. | Reestablish the parameters of the delta check |
| c. | Perform reflex testing |
| d. | Perform a manual method |
____ ; Which of the following is the definition of a reference interval?
| a. | A solution of a known amount of analyte |
| b. | Materials analyzed concurrently with unknown samples |
| c. | Values established for a particular analyte, given a method, instrument, or patient population |
| d. | Validation techniques on flagged samples |
____ ; Which of the following is not considered a postanalytic variable?
| a. | Delta checks |
| b. | Proper anticoagulant used |
| c. | Specimen checked for clots |
| d. | Critical results called |
____ ; Error analysis, standard protocols, and turnaround time are all part of the:
| a. | Quality assurance system |
| b. | Quality control program |
| c. | Reference standards |
| d. | Delta check protocol |
____ ; The average of a group of data points is defined as the:
| a. | Mean |
| b. | Mode |
| c. | Median |
| d. | Modicum |
____ ; Safety training is part of new employee training in health care and includes:
| a. | Biological hazards |
| b. | Chemical hazards |
| c. | Environmental hazards |
| d. | All of the above |
____ ; Control materials are:
| a. | Analyzed concurrently with the unknown samples |
| b. | Substances with a known amount of analyte |
| c. | Used to calibrate the method |
| d. | All of the above |
____ ; Delta checks are used in the hematology laboratory to:
| a. | Compare past patient results to the current result |
| b. | Verify control accuracy |
| c. | Establish a target range |
| d. | Establish reference ranges for a particular analyte |
____ ; When handwashing after a patient contact, the soap application process should last at least:
| a. | 5 seconds |
| b. | 15 seconds |
| c. | 20 seconds |
| d. | 30 seconds |
____ ; Which of the following represents an example of a safety violation in the laboratory?
| a. | Application of cosmetics |
| b. | Mouth pipetting |
| c. | Consuming bottled water |
| d. | All the above |
True/False
Indicate whether the statement is true or false.
____ ; Standard deviation is a measurement of precision.
____ ; Accuracy is a measurement of the true value of an analyte.
____ ; A normal distribution curve will have of the measured values fall within 2 SDs.
Short Answer
; Label the parts of the microscope.
