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25 Cards in this Set
- Front
- Back
A patient sample for uric acid gave an absorbance reading of 0.4; the 50 mg/dL standard used in the test gave an absorbance reading of 0.1. What is the concentration of uric acid in the patient's sample in grams per deciliter?
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0.2
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Which statement describe optimal conditions for transport, handling, and storage of blood specimens for clinical chemistry testing?
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Specimen brought to lab immediately, permitted to clot, serum separated and tested as soon as possible
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Diurnal variation is a term that refers to:
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Time of day of specimen collection
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Ideally, the best type of centrifuge that separates blood cells and plasma for analysis in the clinical laboratory is:
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A temperature-controlled centrifuge with spinning buckets that holds 5–10 mL blood tubes
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What one item must be remembered with handling a tube of blood?
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Gloves and labcoats
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When finished with lab exercises for the day, which order of events should be followed?
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Disinfect area, remove gloves, remove lab coat and wash hands
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Which activity can spread HIV or HBV from one person to another outside of the laboratory?
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Sexual contact
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Face masks and protective eyewear are designed to offer protection from:
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Mucus membrane contact
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Universal Precautions should be observed when working with:
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All patients
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Which has the highest incidence of infectious risk in the clinical laboratory?
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Hepatitis
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Which procedure is most basic and effective in preventing the spread of infectious diseases in the hospital environment?
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Washing hands between each patient
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A laboratory fire ignited by faulty wiring in a chemistry analyzer and partially fueled by surrounding paper products is classified as:
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Class A and C
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What does the most to minimize aerosol production during centrifugation?
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Use stoppered centrifuge tubes or a cover over the rotor
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True or false? A patient's blood urea nitrogen (BUN) was 50 mg/dL on Day 1, and the control serum for BUN was within 2 SD of the mean on that day. On Day 2, the same patient's BUN was 70 mg/dL; again, the control value was acceptable. Should the physician interpret this increase in the BUN as a real pathologic change in the patient? (The only control level available for this test has a mean value of 20 mg/dL and a standard deviation of 2 mg/dL.)
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False
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Serum glucose determinations are done on samples from a control pool each day for 30 days. Quality control statistics are then calculated. The mean is 100 mg/dL and the standard deviation is 4 mg/dL. These statistics are used to label a quality control chart for the mean and +2 SD. Samples from the same control pool are then assayed each day along with patient samples, and control results are plotted on the chart. Results for the first 10 days are as follows:Using 95% confidence limits means that 95% of the control values would fall between:
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92-108
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Serum glucose determinations are done on samples from a control pool each day for 30 days. Quality control statistics are then calculated. The mean is 100 mg/dL and the standard deviation is 4 mg/dL. These statistics are used to label a quality control chart for the mean and +2 SD. Samples from the same control pool are then assayed each day along with patient samples, and control results are plotted on the chart. Results for the first 10 days are as follows:The coefficient of variation for these statistics is:
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4%
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Serum glucose determinations are done on samples from a control pool each day for 30 days. Quality control statistics are then calculated. The mean is 100 mg/dL and the standard deviation is 4 mg/dL. These statistics are used to label a quality control chaff for the mean and +2 SD. Samples from the same control pool are then assayed each day along with patient samples, and control results are plotted on the chart. Results for the first 10 days are as follows:On day 4 above, the light source was changed in the spectrophotometer used for this procedure. How are the results seen in the quality control after that day called?
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A shift
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Serum glucose determinations are done on samples from a control pool each day for 30 days. Quality control statistics are then calculated. The mean is 100 mg/dL and the standard deviation is 4 mg/dL. These statistics are used to label a quality control chart for the mean and +2 SD. Samples from the same control pool are then assayed each day along with patient samples, and control results are plotted on the chart. Results for the first 10 days are as follows:On day 7, the control results are more than two standard deviations from the mean. The first thing you would do is:
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rerun the control with the same reagent
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The coefficient of variation (CV) is:
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Standard deviation expressed as a % of average values use to calculate standerd standard deviation
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The component used to isolate a wavelength in a spectrophotometer is called a:
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Monochromator
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In a spectrophotometric determination, what is the formula for calculating the absorbance of a solution?
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Beer formula
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In the automated chemistry analyzer, data management is a function of:
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Post analytical phase
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The chemical reaction phase includes:
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Does not include measurement
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Would serum uric acid levels may be elevated in patients undergoing cancer chemotherapy?
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Ture
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Describe the correct collection and handling conditions for a blood ammonia measurement
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Draw heparin tube, keep on ice, test immediately
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