Immediately after kidney donation what happens to the creatinine level in the donors –
**Core Concept**
The underlying principle being tested is the physiological response of the body to a reduction in renal mass, specifically the effect on **creatinine levels** after kidney donation. **Creatinine** is a waste product that is filtered by the kidneys, and its level is used as an indicator of kidney function. After kidney donation, the donor is left with a single kidney.
**Why the Correct Answer is Right**
Immediately after kidney donation, the creatinine level in the donors increases because the overall **glomerular filtration rate (GFR)** decreases due to the reduction in renal mass. Although the remaining kidney can hypertrophy over time to increase its function, this process takes time. Initially, the single kidney has to filter the same amount of blood, but with fewer **nephrons**, leading to a temporary decrease in filtration efficiency and thus an increase in **serum creatinine** levels.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the creatinine level does not immediately decrease after kidney donation.
**Option B:** This option might suggest no change, which is not accurate due to the immediate reduction in renal function.
**Option D:** This option is also incorrect as it does not reflect the immediate physiological response to a reduction in kidney mass.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that while there's an initial increase in creatinine levels post-donation, the remaining kidney can compensate over time, and most donors return to near-normal kidney function. However, the exact creatinine level can vary based on individual factors.
**Correct Answer:** B. Increases