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When reviewing the daily results of quality control for the disk diffusion studies, it appears that all of the control zones are too small. What is the most likely reason for this reaction?

A microscopic analysis of a urine sample yielded a moderate number of RBCs (10-25/hpf). However, the reagent strip blood test was negative. What can cause a false negative on the reagent strip blood test?

Which pathway regulates peroxide detoxification in the erythrocyte?

20 uL of whole blood was added to 380 uL of Turk’s diluting solution to perform a manual WBC count. 75 WBCs were counted on 4 large squares in each chamber of the hemocytometer. How many cells/L would be reported?

The pH of a solution is 3.4. What is the [H+]?

A stock standard of urea nitrogen contains 20 mg/mL of urea nitrogen. How would you make 200 mL of a 20 mg/dL working standard?

A stock standard contains 140 Eq/L of sodium and 5 Eq/L of potassium. How would the working standard of 140 mEq/L and 5 mEq/L be prepared, respectively?

Determine the pH if the total CO2 is 29.5 mmol/L and the pCO2 is 46.0 mm Hg. The pK is 6.10.

Determine the logs for each of the following: 860 475,000 0.00098 0.03777

Perform the following conversions: 1500 uL to mL 50 dL to mL 500 L to dL 0.005 g to mg 5.7 g to mg 32 dL to L