Advantages and disadvantages of urine preservation

Question 1

Freezing

Answer 1

Advantage- no cost for specimen transport or storage. simple
disadvantage- destroys formed elements

Question 2

Toluene

Answer 2

A- preserves acetone, diacetic acid and proteins by floating on top (airtight seal)
D- flammable, difficult to separate from specimen

Question 3

thymol

Answer 3

A- inhibits bacteria/fungus

D- false positive for protein

Question 4

Chloroform

Answer 4

A- preserves urine aldosterone levels

D- Settles to bottom of containers

Question 5

Formaldehyde

Answer 5

A- preserves urinary sediment/cells

D- interferes with glucose evaluation

Question 6

Hydrogen Chloride (HCL)

Answer 6

A-Stabilizes steroids

D- hazardous liquid and fumes. Formed elements are destroyed

Question 7

Boric Acid

Answer 7

A- Preserves chemical and formed elements

D- Uric acid may precipitate

Question 8

Preservation Talet

Answer 8

A- preserves urine for dipstick chemical analysis and sediment evaluation
D- Unsuitable for sodium, potassium, and hormone analysis