**Core Concept**
Isotope renogram, also known as a renal scintigraphy, is a nuclear medicine imaging technique used to assess the function and structure of the kidneys. It involves the injection of a small amount of radioactive tracer, typically Technetium-99m MAG3 or Technetium-99m DTPA, which is then concentrated by the kidneys and excreted in the urine.

**Why the Correct Answer is Right**
The isotope renogram provides valuable information about the renal function, including the glomerular filtration rate (GFR), renal blood flow, and the presence of any obstruction or reflux. The radioactive tracer is taken up by the renal parenchyma and excreted in the urine, allowing for the assessment of the renal function and structure. The images obtained from the isotope renogram can help diagnose conditions such as renal impairment, obstruction, or reflux, and guide the management of patients with kidney disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the isotope renogram.
**Option B:** This option is incorrect because it is not a common use of isotope renogram.
**Option C:** This option is incorrect because it is not a typical application of isotope renogram.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that isotope renogram is a sensitive tool for detecting renal impairment, and it can be used to monitor the effectiveness of treatment in patients with kidney disease. A normal isotope renogram can help rule out significant renal impairment, while an abnormal study can guide further investigation and management.

**Correct Answer:** C. Isotope renogram is a nuclear medicine imaging technique used to assess the function and structure of the kidneys.