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
... [Show More] 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 If the media had outdated for a prolonged period, either there would be no reaction or the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D. Use of outdated medium [Show Less]