Lab values & electrolytes worksheet with answers

Which ECG change is typical of hypokalemia?

1. ATall, peaked T waves and a wide QRS
2. BDelta waves and a short PR interval
3. CST elevation in two or more neighboring leads
4. DFlattened T waves and prominent U waves

In iron-deficiency anemia, the transferrin saturation is usually:

1. AVariable
2. BNormal
3. CLow
4. DHigh

Which laboratory result is most closely linked to yellow skin and eyes (jaundice)?

1. ARaised serum potassium
2. BLow platelet count
3. CLow serum calcium
4. DRaised serum bilirubin

Which treatment lowers serum potassium by moving it into the cells?

1. AIV regular insulin given with glucose
2. BOral potassium chloride supplements
3. CIV 0.45% sodium chloride infusion
4. DIV calcium gluconate given over 10 minutes

A patient receives subcutaneous enoxaparin (a low-molecular-weight heparin). Which statement about monitoring is correct?

1. ANo blood tests of any kind are ever needed
2. BNo routine aPTT; platelets and kidney function are checked instead
3. CThe INR is used to adjust each dose, as with warfarin
4. DThe aPTT must be checked every 6 hours to adjust the dose

Which change in clotting tests is normal in late pregnancy?

1. AINR rises to about 3.0
2. BPlatelets rise above 600 × 10³/µL
3. CFibrinogen and D-dimer rise
4. DaPTT doubles from baseline

A patient on hemodialysis receives epoetin, but the hemoglobin has not risen in 2 months. Which results should be checked first?

1. ATSH and the free T₃ level
2. BFerritin and transferrin saturation
3. CTroponin and creatine kinase
4. DAmylase and lipase levels

An 82-year-old woman without a catheter has a urine culture growing bacteria, but no fever, urinary symptoms or change in mental state. What is the best interpretation?

1. AContamination, so the culture must be repeated every week
2. BAsymptomatic bacteriuria, usually not treated with antibiotics
3. CPyelonephritis, which needs admission and IV fluids today
4. DA urinary tract infection that needs urgent IV antibiotics