# Leptin, Serum or Plasma

> This test measures the level of leptin, a hormone produced by fat cells that signals to your brain when you are full. It helps evaluate how your body regulates appetite and energy, which is particularly relevant for individuals investigating the causes of obesity or uncontrolled hunger. These results can help distinguish between rare genetic deficiencies and the more common condition where the body becomes resistant to leptin's signals. However, this test cannot identify the specific root cause of weight gain or diagnose a metabolic disorder on its own.

- Labcorp code: 146712
- Category: [Heart & Metabolic](https://app.picardo.health/labs/tests/heart-metabolic.md)
- Price: shown at checkout, before payment.
- Blood draw: free at a Labcorp location, or $75.00 at home.
- Order link: https://app.picardo.health/labs/order?tests=146712&ref=assistant

## About ordering

A licensed physician reviews every order before any test is run, and results arrive in the person's Picardo account. Ordering is open to adults 18 and over in the US, except New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii and Maine. General health information, not medical advice.