Electrolyte Disorders USMLE Step 1 Practice Questions
55 board-style USMLE Step 1 questions in Nephrology. Each question shows the correct answer; create a free account for the full explanation and adaptive practice.
- USMLE Step 1 · medium25. A 30-year-old man presents to the emergency department with a 3-week history of polyuria and polydipsia. He reports drinking approximately 4-5 liters of water daily and urinatin…
- USMLE Step 1 · medium26. A 55-year-old man with a 3-day history of acute kidney injury presents to the emergency department with generalized weakness and palpitations. He has been taking lisinopril for…
- USMLE Step 1 · medium27. A 75-year-old woman with heart failure on furosemide and ibuprofen presents with acute confusion. Vital signs show BP 92/58, HR 108, RR 20. Labs reveal Na+ 124 mEq/L, serum osmo…
- USMLE Step 1 · hard28. A 56-year-old woman with metastatic breast cancer presents with polyuria and polydipsia. She takes lithium for mood stabilization. Vital signs: BP 136/82, HR 92, RR 16, Temp 37.…
- USMLE Step 1 · hard29. A 34-year-old man with type 1 diabetes presents with Kussmaul respirations, confusion, and fruity breath. Vital signs show BP 102/68, HR 118, RR 24, temp 37.2°C. Labs reveal glu…
- USMLE Step 1 · hard30. A 38-year-old man with acute pancreatitis presents with circumoral paresthesias and tetany. Vital signs show BP 128/82 mmHg, HR 102 bpm, RR 20/min, temperature 38.2°C, SpO2 98%…
- USMLE Step 1 · medium31. A 52-year-old man with severe alcoholism and malnutrition presents with weakness and respiratory difficulty five days after initiating parenteral nutrition support. Vital signs:…
- USMLE Step 1 · medium32. A 66-year-old man with metastatic prostate cancer presents with severe hypercalcemia (serum calcium 13.2 mg/dL). He receives IV zoledronic acid infusion. Vital signs show BP 145…
- USMLE Step 1 · hard33. A 61-year-old man with stage 4 chronic kidney disease presents with muscle weakness and palpitations. Vital signs: BP 158/92, HR 108, RR 20, Temp 37.2°C, SpO2 98%. Serum potassi…
- USMLE Step 1 · medium34. A 74-year-old nursing home resident is brought to the hospital in July because of lethargy and decreased oral intake during a heat wave. Physical examination shows dry mucous me…
- USMLE Step 1 · medium35. A 68-year-old man with nephrolithiasis history presents with progressive bone pain, constipation, and depression. Vital signs: BP 138/82 mmHg, HR 88/min, RR 16/min, temp 37.2°C.…
- USMLE Step 1 · hard36. A 54-year-old man with chronic alcoholism is admitted for severe hyponatremia after several days of poor food intake while drinking large quantities of beer. Laboratory studies…
- USMLE Step 1 · hard37. A 46-year-old man with crush injury is admitted after being trapped under debris for several hours. He has dark urine and severe muscle pain. Laboratory studies show potassium 7…
- USMLE Step 1 · medium38. A 28-year-old man presents with progressive muscle weakness after several days of vomiting from viral gastroenteritis. Blood pressure is 96/60 mm Hg. Laboratory studies show sod…
- USMLE Step 1 · medium39. A 35-year-old woman on long-term proton pump inhibitor therapy presents with weakness and recurrent palpitations. She has had two prior admissions for torsades de pointes. Labor…
- USMLE Step 1 · medium40. A 62-year-old man with stage 5 chronic kidney disease on hemodialysis presents with muscle cramps and pruritus. Vital signs: BP 148/92 mmHg, HR 88/min, RR 16/min, temp 37°C. Lab…
- USMLE Step 1 · hard41. A 64-year-old woman with SIADH-related chronic hyponatremia presents with mild confusion. Vital signs: BP 128/76, HR 88, RR 16, Temp 37°C, SpO2 98%. Serum sodium on admission is…
- USMLE Step 1 · medium42. A 47-year-old woman with Crohn disease has had months of watery diarrhea. She now complains of weakness and lightheadedness. Laboratory studies show sodium 138 mEq/L, potassium…
- USMLE Step 1 · medium43. A 38-year-old man with untreated type 1 diabetes mellitus presents with polyuria, abdominal pain, and deep rapid breathing. Laboratory studies show glucose 540 mg/dL, potassium…
- USMLE Step 1 · medium44. A 56-year-old woman with chronic kidney disease Stage 4 presents with diffuse muscle weakness and palpitations. Vital signs: BP 158/92, HR 104, RR 18, SpO2 98% on room air. ECG…
- USMLE Step 1 · medium45. A 41-year-old woman with chronic alcoholism presents with acute pancreatitis and is hospitalized on day 2. She develops tremor, carpal spasm, and tetany. Vital signs show HR 98/…
- USMLE Step 1 · medium46. A 65-year-old man with metastatic colon cancer presents with severe weakness, constipation, and polyuria. Vital signs: BP 92/58, HR 108, RR 18, Temp 37.2°C, SpO2 98% on room air…
- USMLE Step 1 · medium47. A 58-year-old man with schizophrenia is brought to the clinic because of fatigue and mild confusion. He reports drinking water almost continuously throughout the day. Laboratory…
- USMLE Step 1 · medium48. A 76-year-old man with small cell lung carcinoma is admitted for lethargy and unsteady gait. He is euvolemic on examination. Laboratory studies show sodium 118 mEq/L, serum osmo…