A Study to Assess Plasma Ammonia Time-Normalized Area Under the Curve and Rate of Ureagenesis in Healthy Adult Subjects

2020-02-19 18:28:38 | BioPortfolio


The objective of the study is to characterize 24-hour plasma ammonia levels, characterize urea production rates in healthy normal subjects.


During Part 1, eligible subjects will be asked to participate in 3 inpatient visits, each lasting up to 3 days (Day -1 to Day 2). Each visit will assess 24-hour ammonia levels in plasma and rate of urea production for 4 hours.

During Part 2, eligible subjects will be asked to participate in 1 inpatient visit, lasting up to 3 days (Day -1 to Day 2). The visit will assess 24-hour ammonia levels in plasma and rate of urea production for 4 hours.

Study Design


Ornithine Transcarbamylase Deficiency


Sodium Acetate


PPD Phase 1 Unit
United States




Ultragenyx Pharmaceutical Inc

Results (where available)

View Results


Published on BioPortfolio: 2020-02-19T18:28:38-0500

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Medical and Biotech [MESH] Definitions

A urea cycle enzyme that catalyzes the formation of orthophosphate and L-citrulline (CITRULLINE) from CARBAMOYL PHOSPHATE and L-ornithine (ORNITHINE). Deficiency of this enzyme may be transmitted as an X-linked trait. EC

A ureahydrolase that catalyzes the hydrolysis of arginine or canavanine to yield L-ornithine (ORNITHINE) and urea. Deficiency of this enzyme causes HYPERARGININEMIA. EC

An inherited urea cycle disorder associated with deficiency of the enzyme ORNITHINE CARBAMOYLTRANSFERASE, transmitted as an X-linked trait and featuring elevations of amino acids and ammonia in the serum. Clinical features, which are more prominent in males, include seizures, behavioral alterations, episodic vomiting, lethargy, and coma. (Menkes, Textbook of Child Neurology, 5th ed, pp49-50)

The trihydrate sodium salt of acetic acid, which is used as a source of sodium ions in solutions for dialysis and as a systemic and urinary alkalizer, diuretic, and expectorant.

Substances and drugs that inhibit or block the activity of ORNITHINE DECARBOXYLASE.

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