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Which of the following terms identifies the chemical reagent with the highest purity?

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

A patient has developed a severe case of diarrhea following prolonged treatment with ampicillin. A retosigmoidoscopy was performed and pseudomembranes were observed. Which of the following organisms would most likely be the causative agent:

Polystyrene containers are unsuitable for specimen transport offsite because they

A urinalysis was performed on a sample and the results were as follows: pH            5.5 Protein     2+ Glucose   2+ Ketones   2+ Blood       Neg Bilirubin   Pos Uro          Normal Nitrite      Pos LE           Pos If the sample was stored in the refrigerator with the cap loose and was retested after 6 hours, which result would be altered?

A complete metabolic profile (CMP) was ordered on a patient at 0600 and was collected into a serum separator tube (SST) spun and the serum separated. At 1000 a consulting physician ordered a cold agglutination titer on the blood sample previously drawn. What action should the Clinical Laboratory Scientist take?

Interpret the following results and determine the clinical status of the patient. MARKER                           RESULT HBsAg                                Positive Anti-HBs                             Negative Anti-HBc (Total)                  Negative Anti-HBc (IgM)                    Positive

A clinical laboratory scientist routinely makes peripheral blood smears too thin. The most probable cause is that the scientist is

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?