MLT ASCP Practice Test Questions board practice

MLT ASCP Practice Test Questions board practice
B;
The correct answer for this question is 1300 mg/dL. The laboratorian performed a 1:4
dilution by adding 0.25 mL (or 250 microliters) of patient sample to 750 microliters of
diluent. This creates a total volume of 1000 microliters. So, the patient sample is 250
microliters of the 1000 microliter mixed sample, or a ratio of 1:4. Therefore, the result
given by the chemistry analyzer must be multiplied by a dilution factor of 4. 325 mg/dL x
4 = 1300 mg/dL.
After experiencing extreme fatigue and polyuria, a patient's basic metabolic panel is
analyzed in the laboratory. The result of the glucose is too high for the instrument to
read. The laboratorian performs a dilution using 0.25 mL of patient sample to 750
microliters of diluent. The result now reads 325 mg/dL. How should the techologist
report this patient's glucose result?
A. 325 mg/dL
B. 1300 mg/dL
C. 975 mg/dL
D. 1625 mg/dL
A;
Conversion of only the slant to a pink color in a Christensen's urea agar slant is
produced by bacterial species that have weak urease activity. The reaction in the slant
to the right is often produced by Klebsiella species, as an example. Strong urease
activity is indicated by conversion of the slant and the butt of the tube to a pink color, as
seen in the tube to the left. The slant only reaction in the right tube may be seen early
on if only the slant had been inoculated; however, with a strong urease producer, both
the slant and the butt would turn. Therefore, the reaction is dependent on the strength of
urease activity. If the media had outdated for a prolonged period, either there would be
no reaction or the appearance of only a faint pink tinge, either in the slant, the butt or
both, again depending on the strength of urease production by the unknown organism.
The urease reaction seen in the Christensen's urea agar slant on the far right indicates:
A. Weak activity
B. Strong activity
C. Slant only inoculated
D. Use of outdated medium

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