Albumin is most abundant protein in human
Synthesized in liver
Functions include:
Transport of hormones, fatty acids, and other substances
Maintenance of oncotic pressure
pH buffering
Normal reference range 3.5–5.0 g/dL
Known as "negative acute phase protein" as levels often drop during times of acute physiologic stress
Transport of hormones, fatty acids, and other substances
Maintenance of oncotic pressure
pH buffering
Hypoalbuminemia
Liver disease e.g. cirrhosis 
Proteinuria
Excess renal excretion e.g. nephrotic syndrome, glomerulonephritis
Abnormally colored urine
Excess bowel loss e.g. protein-losing enteropathy in Crohn's
Coagulopathy 
Burns 