Leptin

Test Codes

EPIC: LAB1231963, Beaker: LEPTIN, Quest: 90367

Department

Send Outs

Instructions

Patient should fast overnight prior to collection.

Specimen Collection Criteria

Collect (preferred specimen): One Gold-top SST tube. 
Also acceptable: One plain Red-top tube.

Physician Office/Draw Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to plastic transport tube and refrigerate (2-8°C or 36-46) prior to transport.

Preparation for Courier Transport

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46). (Minimum: 0.2 mL)

Rejection Criteria

• Moderate hemolysis.
• Gross hemolysis.
• Hypericteric specimens.
• Specimens not collected and processed as indicated.

In-Lab Processing

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to plastic transport tube and refrigerate (2-8°C or 36-46) prior to transport.

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46). (Minimum: 0.2 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 8 hours
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 35 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions. 

Laboratory

Sent to Quest Diagnostics, Wood Dale, IL.

Performed

Monday, Thursday.
Results available in 4-8 days.

Reference Range

Pediatric Male and Female
5-9.9 Years           0.6-16.8 ng/mL
10-13.9 Years       1.4-16.5 ng/mL
14-17.9 Years       0.6-24-9 ng/mL

Adult Lean Subjects (18-71 Years) with BMI range of 18-25
Male                      1.8-13.4 ng/mL
Female                  4.7-23.7 ng/mL

Adult Subjects (19-60 Years) with BMI range of 25-30
Male                      1.8-19.9 ng/mL
Female                  8.0-38.9 ng/mL

Test Methodology

Electrochemiluminescence (ECL).

Clinical Utility

Leptin is an adipocyte-derived hormone that is essential for normal body weight regulation. Leptin production is under neuroendocrine control so that serum concentrations vary directly with the amount of triglycerides stored in adipose tissue depots.

CPT Codes

83520

Contacts

Last Updated

11/19/2025