实验室检查值与电解质练习卷（附答案）

What does a "culture and sensitivity" test of a sample show?

1. AThe amount of antibiotic in the patient's blood
2. BWhich organism grows and which antibiotics work on it
3. CWhether the patient is allergic to an antibiotic
4. DHow many white cells are present in the sample

What is a typical reference range for the reticulocyte count in an adult?

1. AAbout 0.01–0.05% of red cells
2. BAbout 40–50% of red cells
3. CAbout 10–20% of red cells
4. DAbout 0.5–2% of red cells

What does the term "left shift" mean on a white cell differential?

1. AA rise in the number of eosinophils
2. BA fall in all the white cell types together
3. CMore immature neutrophils (bands) than normal
4. DMore lymphocytes than neutrophils in the blood

When should a blood sample for a digoxin level be drawn to be interpreted correctly?

1. AAt least 6–8 hours after a dose, often just before the next one
2. BAt any time, because digoxin levels do not change during the day
3. COnly after a meal, because food is needed for absorption
4. DWithin 30 minutes after an oral dose to show the peak level

A patient has macrocytic anemia with numbness and tingling of the feet and poor balance. Which deficiency is most likely?

1. AVitamin B₁₂
2. BFolate (folic acid)
3. CIron (low ferritin)
4. DVitamin C (ascorbic acid)

A healthy patient's result is slightly outside the laboratory reference range, and all other results are normal. Which statement best explains why this can happen?

1. AAny result outside the range always means disease is present
2. BRanges cover about 95% of healthy people, so some fall outside
3. CReference ranges include every healthy person without exception
4. DReference ranges are the same in every laboratory worldwide

Which set of results most strongly suggests hemolytic anemia?

1. ALow hemoglobin, low platelets, low white cells, low reticulocytes
2. BLow hemoglobin, low reticulocytes, low MCV, low ferritin
3. CLow hemoglobin, high reticulocytes, high unconjugated bilirubin, high LDH
4. DLow hemoglobin, high MCV, low vitamin B₁₂, normal bilirubin

A patient with C. difficile diarrhea has a white cell count of 24 × 10³/µL and a creatinine that has risen to 2.1 mg/dL (186 µmol/L). What does this indicate?

1. ASevere C. difficile infection
2. BSuccessful response to treatment
3. CUnrelated chronic kidney disease
4. DMild infection needing no treatment