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Hyperammonaemia investigations

About This Test

Department: Biochemistry


  • 2 x Lithium heparin bottles (green top) (send one sample on ice)
  • 1 x Fluoride oxalate (grey top)
  • Urine sample (white top universal)


Appropriate tests include:

  • ammonia, urea and electrolytes, liver function tests and amino acids
  • urine organic and amino acids and orotic acid
  • lactate and glucose measurement

Elevated ammonia levels should always be confirmed with a repeat specimen.

Please contact the laboratory if you require information on second line tests associated with hyperammonaemia.

Other Comments:

These requirements have been created in partnership with Birmingham Children’s Hospital and this Trust’s paediatric guidelines. Ensure that you refer to this Trust’s Paediatric guidelines for the management of patients with these presentations.