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NGAL – Biomarker for Acute Kidney Injury

NGAL is a biomarker used for the early detection of kidney damage. It is measured in blood and urine and enables rapid diagnosis of acute kidney injury.

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Things worth knowing about "NGAL"

NGAL is a biomarker used for the early detection of kidney damage. It is measured in blood and urine and enables rapid diagnosis of acute kidney injury.

What is NGAL?

NGAL stands for Neutrophil Gelatinase-Associated Lipocalin, a protein belonging to the lipocalin family. It is produced in various tissues throughout the body, including the kidneys, liver, lungs, and neutrophil granulocytes (a type of white blood cell). In clinical medicine, NGAL serves as an important biomarker for the early detection of acute kidney injury (AKI).

Biological Function

NGAL fulfils several roles in the body:

Iron transport: NGAL binds iron complexes and is involved in the regulation of iron metabolism.
Immune defence: It inhibits bacterial growth by depriving bacteria of the iron they need to survive.
Cytoprotection: NGAL helps protect cells from damage and supports the regeneration of renal tubular cells following injury.

NGAL as a Biomarker for Acute Kidney Injury

During an episode of acute kidney injury (AKI), NGAL concentrations in the blood and urine rise rapidly – as early as 2 to 6 hours after the triggering event. This is a key advantage over the traditional kidney marker creatinine, whose elevation only becomes measurable after 24 to 72 hours. Early detection allows timely treatment and can prevent permanent kidney damage.

Measurement and Diagnosis

NGAL can be measured in both blood serum (plasma NGAL) and urine (urinary NGAL). Both measurements provide valuable but distinct information:

Plasma NGAL: Primarily reflects systemic (body-wide) inflammatory responses and overall kidney dysfunction.
Urinary NGAL: Is more specific for direct kidney damage and indicates whether the renal tubules (small filtration tubes in the kidney) are affected.

Normal urinary NGAL levels are typically below 150 ng/ml; values above this threshold may indicate AKI. Reference ranges may vary depending on the laboratory and measurement method used.

Clinical Applications

NGAL is used in a variety of clinical settings:

Cardiac surgery: Early detection of kidney damage following procedures involving cardiopulmonary bypass.
Intensive care: Monitoring of patients with sepsis (bloodstream infection) or severe circulatory failure.
Contrast-induced nephropathy: Detection of kidney damage following administration of contrast agents during imaging procedures.
Kidney transplantation: Assessment of graft function following a kidney transplant.
Chronic kidney disease: NGAL may also be used to monitor the progression of chronic kidney conditions.

Limitations and Considerations

Although NGAL is a promising biomarker, certain limitations must be considered:

NGAL levels can also be elevated in cases of inflammation, infection, or certain cancers without any underlying kidney injury.
Results must always be interpreted within the broader clinical context.
NGAL does not replace conventional kidney parameters such as creatinine or glomerular filtration rate (GFR), but rather complements them.

References

Mishra J. et al. - Neutrophil gelatinase-associated lipocalin (NGAL) as a biomarker for acute renal injury after cardiac surgery. Lancet, 2005; 365(9466): 1231–1238.
Haase M. et al. - Accuracy of Neutrophil Gelatinase-Associated Lipocalin (NGAL) in Diagnosis and Prognosis in Acute Kidney Injury. American Journal of Kidney Diseases, 2009; 54(6): 1012–1024.
Devarajan P. - Neutrophil gelatinase-associated lipocalin: a promising biomarker for human acute kidney injury. Biomarkers in Medicine, 2010; 4(2): 265–280.

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