General Information

UPHSM LIS Test #: 4674
Testing Time:
Testing Lab: Labcorp

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 0.5mL (0.2min) serum
Temperature: Refrigerated
Tube Type: Red-top tube or gel-barrier tube
Collection Info:
Specimen:  Serum

Volume:  0.5 mL

Minimum Volume:  0.2 mL (Note: This volume does not allow for repeat testing.)

Container:  Red-top tube or gel-barrier tube

Collection:  Separate serum from cells. Transfer separated serum to a plastic transport tube. Please include the patient's age on the test request form.

Storage Instructions:  Refrigerate.

Causes for Rejection:  Plasma specimen


Immunochemiluminometric assay (ICMA)

Clinical Utilities

Use:  Diagnose acromegaly, in which Sm-C and GH are increased; evaluate hypopituitarism and hypothalamic lesions in children (diagnosis of dwarfism and response to therapy). Low levels occur in Laron dwarfism, an entity in which GH is increased.

Limitations:  Malnutrition will cause low somatomedin-C levels in spite of normal amounts of circulating growth hormone. The Sm-C level does not distinguish pituitary dwarfism from constitutional delay of growth and development

CPT Codes


* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Reference Range

See Report