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Alpha-1-antitrypsin (A1AT)

Category Biochemistry >> Proteins
Test background

Familial A1AT deficiency leads to predominantly unrestricted proliferation of neutrophil-mediated elastase in the tissues of the lung, causing extensive collateral damage and subsequent emphysema-like symptoms in adults. Alternatively, neonatal accumulation of dysfunctional A1AT in the liver causes the production of abnormal polymers that damage the surrounding tissues of the liver.

Clinical Indications

Unexplained liver cirrhosis in juveniles (and rarely adults) Suspected early-onset emphysema (juveniles/adults) or emphysema with or without family history Observed deficiency as seen on routine serum electrophoresis

Reference range


Adult 1.1-2.1 g/L
Newborn 0.9-2.2 g/L
Less than 6 months 0.8-1.8 g/L
6 months-1 year 1.1-2.0 g/L
1-5 years 1.1-2.2 g/L
5-10 years 1.4-2.3 g/L
10-15 years 1.2-2.0 g/L
Sample & container required Serum (red top) or SST (gold top)
Sample volume 0.5 mL
Transport storage Stable at 2-8°C for 72 hours. Please freeze pending dispatch for analysis.
Sample can be sent by first class post.
Turnaround time 1 week

Grossly haemolysed samples are unsuitable for this assay.