Argininosuccinic Aciduria

Argininosuccinic aciduria (ASA) is a disorder of the urea cycle. Patients may present at any age, but onset is typically in the neonatal period or late infancy. The neonatal presentation is characterized with a normal delivery followed by lethargy, vomiting, poor feeding, hypothermia, hyperventilation, decreased consciousness and coma, while later-onset patients usually present with less severe symptoms including vomiting, failure to thrive, irritability, behavioral problems or psychomotor retardation. Trichorrhexis nodosa may occur, but usually in severe cases

Tests Available

Forms and Documents

Test Details

  • Confirmation of biochemical diagnosis
  • Carrier testing
  • Prenatal diagnosis in at risk pregnancies


4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.


  • 270.6 Disorders of urea cycle metabolism, Argininosuccinic aciduria, Citrullinemia, Disorders of metabolism of ornithine, citrulline, argininosuccinic acid, arginine, and ammonia, Hyperammonemia, Hyperornithinemia
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**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.


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