Renal azotemia Quiz: Ace Your Exams
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A 48-year-old man is brought to the emergency department for evaluation of altered mental status and flank pain. The patient was found unconscious on a sidewalk by a bystander who called EMS. The patient was provided with intravenous fluids en route, after which his mental status improved. Upon initial assessment, the patient endorses left flank pain radiating to the groin. Temperature is 37.0°C (98.6°F), pulse is 80/min, respirations are 20/min, and blood pressure is 135/85 mmHg. Physical examination demonstrates dry mucous membranes. The patient’s eyes open spontaneously, and he is oriented to time and place but not to person. Initial laboratory studies are shown. During the first six hours of admission, urine output is 40 mL.
Which of the following additional laboratory findings is most likely to be observed in this patient?
| Laboratory value | Result | Reference range |
| Serum chemistry | ||
| Sodium | 138 mEq/L | 136-146 mEq/L |
| Potassium | 3.6 mEq/L | 3.5-5 mEq/L |
| Chloride | 99 mEq/L | 95-105 mEq/L |
| Bicarbonate | 18 mEq/L | 22-28 mEq/L |
| Serum creatinine | 2.8 mg/dL | 0.6-1.2 mg/dL |
| Urinalysis | ||
| Sediment | Granular “muddy brown” casts and envelope shaped crystals | None |
| Arterial blood gas (ABG) | ||
| pH | 7.2 | 7.35-7.45 |
| Partial pressure of carbon dioxide (pCO2) | 40 mmHg | 33-45 mmHg |
| Partial pressure of oxygen (pO2) | 85 mmHg | 75-105 mmHg |
Which of the following additional laboratory findings is most likely to be observed in this patient?
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