9 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Accredited Laboratory Partner
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Elevated in urea cycle disorders. Helps distinguish causes of hyperammonemia.
Frozen Urine
3 mL
2 plastic urine containers, no preservative
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Collect urine and separate into 2 plastic urine containers to ship, both frozen. Frozen specimen cannot be shared with other tests.
| Temperature | Period |
|---|---|
| Frozen | 14 days |