Chemical preservation of urine:

1.     Toluol – for 100ml of urine 2ml toluol
2.     Thymol – small floating lamp of thymol. Several day preserved but protein 
                  can be false
 positive.                                                                                                   
3.     Formaline – 1drop for 30ml of urine.
                       Advantage: Good for preservation the formed element.
Disadvantage: Pricipitated protein & can reduce Benedict solution.
4.     Boric acid- 3gm for 120ml urine.
Disadvantage: Yeast can grow. Uric acid crystal precipitated.

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