Urinalysis - The Carter Center
Urinalysis - The Carter Center
Urinalysis - The Carter Center
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15<br />
Table .1 Some Methods of Preservation, and their Advantages<br />
and Disadvantages<br />
Methods Advantages Disadvantages<br />
Refregeration<br />
(2-6 o C)<br />
No chemical Interference Use for a short period of time (3-6 hours). For prolonged<br />
periods additonal preservatives must be used<br />
Freezing For specimen transport May destroy formed elements<br />
Toluene<br />
Preserves acetone, Flammable<br />
(Till it forms thin layer over the<br />
urine)<br />
Reducing Substances,<br />
protein<br />
Thymole<br />
Preserves most<br />
Can cause false positves for proteins<br />
( small crystal 5 mm<br />
diametre/100ml urine)<br />
consitiuents<br />
Chloroform<br />
Preserves urine<br />
Settles to the bottom of the urine containers<br />
(1 tablet/60 ml urine)<br />
aldosterole level<br />
Formaldehyde<br />
Preserves formed Interfers with glucose evaluation<br />
(1 drop/30 ml urine)<br />
elements<br />
HCL<br />
Stablizes steroides, Formed elements are destroyed,<br />
(1 drop/15 ml urine)<br />
catecolamines<br />
Boric acid<br />
Preserves chemicals and Precipitate uric acid<br />
formed elements<br />
Sodium Carbonate<br />
Preserves porphyrines<br />
and urobilinogen<br />
Interfers with other urine constituents
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