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Serum albumin reflects the underlying illness, e.g. malignant disease, trauma, sepsis, etc. all of which result in a lowering of plasma albumin level of less than 30g/l. (3.5-5.5 gm/dL)
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Other plasma proteins, e.g. transferrin, retinal binding protein, prealbumin( 16 to 30 mg/dL) have been evaluated as markers of nutritional status