Lab values & electrolytes worksheet with answers

What is a typical adult reference range for blood urea nitrogen (BUN)?

1. AAbout 70–99 mg/dL (urea 25–35 mmol/L)
2. BAbout 135–145 mg/dL (urea 48–52 mmol/L)
3. CAbout 7–20 mg/dL (urea 2.5–7.1 mmol/L)
4. DAbout 0.6–1.2 mg/dL (urea 0.2–0.4 mmol/L)

Which urine test is used to screen people with diabetes for early kidney damage?

1. AA urine pregnancy test
2. BUrine specific gravity
3. CThe urine albumin-to-creatinine ratio (ACR)
4. DA urine culture for bacteria

What does the term pancytopenia mean?

1. ALow red cells with normal platelets
2. BHigh red cells, white cells and platelets
3. CLow red cells, white cells and platelets
4. DHigh white cells with low platelets

Which blood collection practice helps prevent hemolysis of the sample?

1. AForcing blood quickly through a needle into the tube
2. BUsing the smallest needle available for every patient
3. CLeaving the tourniquet on for at least 3 minutes
4. DGently inverting the tubes instead of shaking them

A patient on levothyroxine has palpitations, weight loss and a TSH of 0.05 mIU/L. What is the most likely explanation?

1. AThe thyroid is now completely normal
2. BThe levothyroxine dose is too high
3. CThe levothyroxine dose is too low
4. DThe patient has stopped the drug

Apart from the lithium level, which tests are monitored regularly in long-term lithium therapy?

1. ATroponin and creatine kinase (CK)
2. BKidney function and thyroid function
3. CLiver enzymes and serum amylase
4. DINR and the platelet count

The nurse teaches a patient who is collecting a 24-hour urine sample at home. Which statement shows a need for further teaching?

1. A"I'll keep the container cool as the laboratory told me to"
2. B"I'll empty my bladder at the end time and add that urine"
3. C"If I forget to save one void, I'll just carry on to the end"
4. D"I'll ask whether any foods or drugs should be avoided first"

A nursing student has a positive interferon-gamma release assay (IGRA) for tuberculosis, no symptoms and a normal chest X-ray. What does this most likely mean?

1. ALatent TB infection, which is not contagious
2. BPast BCG vaccination only, with no infection
3. CA false result, as the test does not detect TB
4. DActive pulmonary TB, which is contagious