All are major criteria for Jones classification EXCEPT
**Core Concept**
The Jones classification is a system used to categorize pyelonephritis based on the severity of the infection. It involves the assessment of the patient's clinical symptoms, laboratory findings, and imaging results to determine the extent of kidney involvement.
**Why the Correct Answer is Right**
The Jones classification includes several major criteria, such as:
* Temperature > 103°F (39.4°C)
* Pulse rate > 120 beats/min
* Leukocyte count > 15,000 cells/mm³
* Blood pressure > 140/90 mmHg
* Blood culture positive for E. coli
These criteria are used to differentiate between mild, moderate, and severe pyelonephritis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a major criterion for the Jones classification, as it does not directly assess the severity of the infection.
**Option B:** This option is a major criterion for the Jones classification, as it indicates a high fever, which is a sign of severe infection.
**Option C:** This option is a major criterion for the Jones classification, as it indicates a high heart rate, which is a sign of severe infection.
**Option D:** This option is a major criterion for the Jones classification, as it indicates a high white blood cell count, which is a sign of severe infection.
**Clinical Pearl / High-Yield Fact**
The Jones classification is an important tool for clinicians to assess the severity of pyelonephritis and guide appropriate treatment. It is essential to remember that the classification is based on a combination of clinical symptoms, laboratory findings, and imaging results.
**Correct Answer: A.**