Which dye-binding reagent is most common for albumin measurement?

• A. BCP
• B. BCG
• C. HABA
• D. Methyl Orange

Answer: (B)

Dye-binding dyes quantify albumin by forming a colored complex with the protein, and the intensity of that color is proportional to the albumin concentration. Bromocresol green is the most commonly used reagent for routine serum albumin measurement because the albumin–dye complex forms quickly, provides a strong and well-behaved response across the clinically relevant range, and the reagents are inexpensive and readily integrated with automated analyzers. While other dyes like bromocresol purple offer higher specificity in some contexts, the practicality, cost, and broad compatibility of bromocresol green make it the default choice for everyday albumin testing. All dye-based methods can be influenced by other serum constituents (bilirubin, hemoglobin, lipids, high globulin levels), but these interferences are generally manageable in routine practice.