A 58-year-old man has the sudden onset late one evening of severe pain in his left great toe. There is no history of trauma. On examination there is edema with erythema and pain on movement of the left 1st metatarsophalangeal joint, but there is no overlying skin ulceration. A joint aspirate is performed and on microscopic examination reveals numerous neutrophils. Over the next 3 weeks, he has two more similar episodes. On physical examination between these attacks, there is minimal loss of joint mobility. Which of the following laboratory test findings is most characteristic for his underlying disease process?
A 58-year-old man has the sudden onset late one evening of severe pain in his left great toe. There is no history of trauma. On examination there is edema with erythema and pain on movement of the left 1st metatarsophalangeal joint, but there is no overlying skin ulceration. A joint aspirate is performed and on microscopic examination reveals numerous neutrophils. Over the next 3 weeks, he has two more similar episodes. On physical examination between these attacks, there is minimal loss of joint mobility. Which of the following laboratory test findings is most characteristic for his underlying disease process?
💡 Explanation
**Core Concept**
The patient's presentation is consistent with acute gouty arthritis, characterized by sudden onset of intense pain, swelling, and erythema in the affected joint, often the first metatarsophalangeal joint. This condition is caused by the deposition of monosodium urate crystals in the joint space, leading to an inflammatory response.
**Why the Correct Answer is Right**
The patient's symptoms and joint aspirate findings of numerous neutrophils are classic for gout. Gout is caused by elevated serum urate levels, which can be due to increased production of uric acid or decreased excretion by the kidneys. The correct laboratory test finding that is most characteristic of gout is hyperuricemia, which is the elevated serum level of uric acid. This is due to the reduced excretion of uric acid by the kidneys or increased production of uric acid by the body.
**Why Each Wrong Option is Incorrect**
* **Option A:** Elevated creatinine levels would indicate impaired renal function, which can contribute to hyperuricemia, but this is not the most characteristic laboratory finding for gout.
* **Option B:** Leukocytosis with an elevated white blood cell count can be seen in various conditions, including infections and inflammatory diseases, but this is not specific for gout.
* **Option D:** A normal serum urate level would make gout less likely, but this option is not the most characteristic laboratory finding for gout.
**Clinical Pearl / High-Yield Fact**
It's essential to note that gout can be asymptomatic until it presents acutely, and recurrent episodes can occur due to persistent hyperuricemia. The presence of tophi (deposits of monosodium urate crystals in the skin or joints) is a hallmark of chronic gout, indicating long-standing hyperuricemia.
**Correct Answer:** C. Hyperuricemia is the most characteristic laboratory finding for gout, indicating elevated serum levels of uric acid.
✓ Correct Answer: C. Hyperuricemia
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