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Questions and Answers
Which preservative is good for chemical constituents but not effective if bacteria are present?
Which preservative is good for chemical constituents but not effective if bacteria are present?
- Formalin
- Toluene (correct)
- Thymol
- Chloroform
What is the concentration of Formalin recommended for urine preservation?
What is the concentration of Formalin recommended for urine preservation?
- One small crystal per 100 ml of urine
- 3 drops/100 ml urine (correct)
- 5 ml per 100 ml urine
- 2 ml/100 ml urine
What limitation is associated with Thymol?
What limitation is associated with Thymol?
May interfere with the acid precipitation test for proteins.
Chloroform is used at a concentration of ______ per 100 ml urine.
Chloroform is used at a concentration of ______ per 100 ml urine.
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Commercial preservative tablets may interfere with formaldehyde concentration.
Commercial preservative tablets may interfere with formaldehyde concentration.
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Study Notes
Preservative Use for Urine
- Toluene is effective for preserving chemical constituents in urine samples. It floats on the surface and isn't effective if bacteria are present.
- Formalin is suitable for preserving sediment in urine samples, however, it can cause protein precipitation.
- Thymol is useful for preserving urine samples but may interfere with the protein precipitation test.
- **Chloroform ** interferes with cellular characteristics, making it unsuitable for preserving sediment.
- Commercial preservative tablets are a good option for controlling formaldehyde concentration to avoid interference with other tests.
Collection and Analysis of Urine Samples
- Randomly collected urine samples may be diluted due to increased fluid intake. This needs to be considered when analyzing the results.
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