A 4.0 mg/dL creatinine standard is needed.  To prepare 100 mL of the working standard, how much stock standard of 1 mg/mL creatinine is needed?

A physician orders a factor IX assay. Which of the following screening tests had most likely been performed and found to be abnormal?

A potential recipient is crossmatched with four units of RBCs prior to surgery. The AHG crossmatches are all compatible; however, the antibody screen is positive after the antiglobulin test (AHG phase). What should the Clinical Laboratory Scientist do?

Which of the following is a cytopathic effect induced by viral growth?

2.0 mg phenol/ 60min/ 100mL (molecular weight of phenol = 94) is expressed as how many IU?

Out of the below choices, an increased level of circulating thyroid hormone levels are most indicative of

Express 0.0018 μmol/min/mL as IU.

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?

Calculate the pH of an acetate buffer composed of 0.30  M sodium and 0.10 M acetic acid (pKa for acetic acid is 4.76)

For an AST determination, 0.20 mL of serum was used. The change in absorbance was measure at 340 nm with a 3.0 mL reaction mixture. The initial reading was 0.54 A and the reading after 5 minutes was 0.32 A. Report the AST value in IU.