Catecholamines, Fractionated, 24-Hour Urine with Creatinine

Test Code

39627

CPT Codes
82384, 82570

Includes

Creatinine, Norepinephrine, Epinephrine, Dopamine, and Total Catecholamines (calculated)

CPT code 81050 may be added at an additional charge for volume measurement

Preferred Specimen

10 mL aliquot from 24-hour urine preserved with 25 mL 6N HCl, collected in plastic 24-hour urine container

Patient Preparation
It is preferable for the patient to be off medications for three days prior to collection. However, common antihypertensives (diuretics, ACE Inhibitors, calcium channel blockers, alpha and beta blockers) cause minimal or no interference. Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection.

Minimum Volume

5 mL

Other Acceptable Specimens

10 mL aliquot from 24-hour urine, unpreserved, with pH < or = 6, collected in plastic 24-hour urine container

Instructions

Collect 24-hour urine with 25 mL 6N HCL to maintain a pH < or = 3. If no preservative is used, specimen must be stored refrigerated during collection but shipped frozen and pH must be < or = 6. Record 24-hour urine volume and patient's age on test request form and on urine container.

Transport Temperature

Preserved urine: Room temperature
Unpreserved urine: Frozen

Specimen Stability

Preserved
Room temperature: 7 days
Refrigerated: 30 days
Frozen: 49 days

Unpreserved
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Preserved urine received refrigerated with pH >3 • Unpreserved urine received frozen with pH >6

Methodology
High Performance Liquid Chromatography (HPLC)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

Monday-Saturday Morning
Report available: 3 Days

Limitations

Recent surgery, traumatic injury, upright posture, cold, anxiety, pain, clonidine withdrawal, and concurrent acute or chronic illness may produce elevated results..

Reference Range

See Laboratory Report

Clinical Significance

The three catecholamines (norepinephrine, epinephrine and dopamine) are the principal secretory products of neural tissue. Clinically, the measurement of circulating catecholamines is valuable in the diagnosis of catecholamine secreting tumors associated chiefly with hypertension (pheochromocytomas, neuroblastomas and gangliomas) and with the evaluation of orthostatic hypotension.

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.