A Protein estimation test is confused with
On heating the urine, turbidity arises if proteins are present.
However, turbidity also arises if phosphates or carbonates are present in urine. This can leads to confusion.
Addition of few drops of acetic acid dissolves the turbidity due to phosphates or carbonates, whereas turbidity due to proteins remains persistent.
Phosphates
Nitrates
Sulphates
Bile salts