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Worcestershire Acute Hospitals NHS Trust
CategoryClinical Biochemistry
Test information
To help diagnose severe liver disease and certain genetic urea cycle disorders. Blood ammonia increases in infants relative to adults because of the continuing development of hepatic circulation after birth. Sick pre-term infants may present with increased ammonia (up to 200 nmol/L) in the absence of any clinical findings. Infection should always be considered as a possible cause. Other more specific causes are as follows: inherited metabolic disorder, transient hyperammonaemia, IV feeding, infection, liver disease, Valproate, Reye's syndrome.
On ice, to be received in lab within 15min collection
Reference range
0-40 umol/L
Special requirements
Plasma (separated within 15-30 min collection)
Tube type
Purple top tube
TAT Inpatient
1.5 hrs (ED)4 hrs (IP)
TAT GP/Outpatient
24 hrs
Referral lab
Local, Clinical Biochemistry
Page last updated: 11 January 2022