1 mL blood in a heparin tube preferred. Preferably send on ice to the laboratory immediately as some amino acids are labile.
A brief clinical history is essential.
If free homocystine or cystine is required sample MUST go on ice immediately to lab.
For routine analysis a sample sent immediately at room temperature to the laboratory is acceptable. Samples need to be spun, separated and frozen within an hour of collection.
4.5 mL PST Blood (Preferred) 3.5 mL SST Blood 1 mL Microsample Blood 1 mL Paediatric Micro-heparin Blood Reference Intervals
The reference interval will be provided with the result.
Uncertainty of measurement: 7 - 11%
Turnaround Time: Between 5 hours and 1 week, 3 days
Test is available urgently if required contact laboratory on x22016 or via LabLink
Diagnostic Use and Interpretation
These analyses are designed primarily for the investigation and monitoring of inherited disorders of amino acid metabolism. For investigating a person with possible metabolic disease urine amino acids are a more appropriate test. If metabolic disease is highly likely or you need quantifiable results then plasma levels are appropriate. Plasma amino acids are required with fasting studies, to review protein nutritional status and to monitor known metabolic disease.
For further information contact laboratory: ext 22016 or via Lablink
or, contact the Metabolic Physician-on-call: 09 367 0000
Specimen Transport Instructions for Referring Laboratories
Specimen must arrive on ice for free homocystine or cystine requests.
Other requests preferably on ice, separate 0.2ml plasma and freeze specimen immediately. Accept ambient samples up to 4 hours post collection but please note on form.
Send frozen to LabPlus (-70 o C if possible).