α1-Microglobulin
Method: Latex Immunoturbidimetric AMG
Liquid reagent: R1: R2=1:1 AMG
Key Clinical Uses
1. Marker of Tubular Kidney Damage
- Increased urinary α1-microglobulin indicates proximal tubular dysfunction
- Seen earlier than creatinine changes
- Helpful in early detection of kidney injury
Common causes:
- Drug-induced nephrotoxicity (e.g., aminoglycosides, cisplatin)
- Heavy metal exposure (cadmium, mercury)
- Acute tubular necrosis
- Interstitial nephritis
- Diabetic nephropathy (early stage)
2. Differentiation of Proteinuria
- Glomerular proteinuria → mainly albumin
- Tubular proteinuria → increased α1-microglobulin, β2-microglobulin
- Helps clinicians identify the site of renal injury
3. Monitoring Renal Transplant & Chronic Kidney Disease
- Rising levels suggest tubular rejection or damage
- Useful in follow-up of CKD progression
4. Advantage over β2-Microglobulin
- α1-microglobulin is stable in acidic urine
- More reliable for routine urine testing
α1-Microglobulin (AMG) – Sensitivity
1. Analytical sensitivity (limit of detection)
For most routine lab assays:
- Immunoturbidimetric / Immunonephelometric methods:
≈ 2–5 mg/L (some high-sensitivity kits go slightly lower) - ELISA (research / specialized labs):
≈ 0.1–1 mg/L
Exact sensitivity always depends on the reagent kit and analyzer.
2. Clinical sensitivity (diagnostic usefulness)
α1-Microglobulin is highly sensitive for proximal tubular damage, especially:
- Early tubular proteinuria
- Drug-induced nephrotoxicity
- Diabetic nephropathy (tubular involvement)
- Heavy metal exposure (Cd, Pb)
It often rises earlier than serum creatinine, making it a sensitive early marker for tubular dysfunction.
3. Sample type matters
- Urine α1-microglobulin → highest diagnostic sensitivity
- Serum α1-microglobulin → more limited, mainly supportive
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