Catecholamines, Fractionated, Urinary Free (CATECHO UR)
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| Synonyms:
| Urinary epinephrine; urinary norepinephrine; urinary dopamine |
| Specimen: | Urine; 24 hour urine collection in a 24 hour container with 30 mL 6N HCl preservative.
Caution: Strong acid. May cause skin burns.
Instruct patient on proper 24 hour urine collection procedure and to keep collection on ice. |
| Volume: | 30 mL aliquot |
| Minimum Volume: | 4 mL |
| Collection: | A 30 mL aliquot may be submitted with documentation of 24 hour volume on specimen and request form.
pH must be less than 5. Refrigerate specimen at 2-8°C. |
| Rejection Criteria: | Specimen not kept chilled; specimen with no preservative; pH not less than 3; improper labeling. |
| Reference Range: | See report. |
| Methodology: | Liquid chromatography/tandem mass spectrometry (LC/MS-MS) |
| Test Use: | Work up neuroblastoma. Diagnose pheochromocytoma. Work up palpitation, severe headache, diaphoresis. |
| Additional Information: | Assay is of most value for pheochromocytoma when specimen is collected during a hypertensive episode. False negatives and false positives do occur. |
| Testing Includes: | Specimen sent to LabCorp. Test code # 004176.
Includes urinary epinephrine, urinary norepinephrine and urinary dopamine.
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| Testing Facility: | LabCorp |