A patient presents with symptoms of hypoglycemia. Investigations reveal decreased blood glucose and increased insulin levels. The c-peptide assay is done which shows normal levels of C-peptide. The most likely diagnosis is –
**Core Concept**
The patient's presentation of hypoglycemia with increased insulin levels and normal C-peptide levels suggests a problem with insulin action rather than insulin secretion. This is because C-peptide is a byproduct of insulin synthesis and is co-secreted with insulin in equal amounts, making it a marker of endogenous insulin production.
**Why the Correct Answer is Right**
The patient's symptoms and laboratory findings are consistent with a diagnosis of insulin resistance, a condition in which the body's cells become less responsive to insulin. This leads to increased insulin levels in an attempt to compensate for the decreased glucose uptake by cells. The normal C-peptide levels suggest that the pancreas is still producing insulin, but the body is not utilizing it effectively. The increased insulin levels are a result of the pancreas trying to overcome the insulin resistance.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not explain the normal C-peptide levels in the context of hypoglycemia and increased insulin levels.
**Option B:** This option is incorrect because it does not accurately describe the patient's presentation of hypoglycemia with increased insulin levels.
**Option C:** This option is incorrect because it does not provide a clear explanation for the normal C-peptide levels and the increased insulin levels.
**Clinical Pearl / High-Yield Fact**
In patients with insulin resistance, the body produces more insulin in an attempt to compensate for the decreased glucose uptake by cells. This can lead to increased insulin levels, which can mask the diagnosis of insulin resistance.
**Correct Answer:** C. Insulin resistance is a condition in which the body's cells become less responsive to insulin, leading to increased insulin levels and potentially hypoglycemia.