specimen preservation Flashcards
1
Q
why do you want to examine the urine sample ASAP?
A
to eliminate effects of chemical and cellular change
2
Q
refrigerate or chemically preserve if not examined within:
A
one hour
3
Q
you may refrigerate the sample for up to ___ hours without affecting results
A
6 hours
4
Q
for specific gravity, urine must be heated to:
A
room temperature
5
Q
7 changes that occur as urine samples stand at room temperature
A
- RBCs decrease/crenate
- pH increases due to bacterial breakdown of urea to ammonia (goes alkaline)
- bacteria increases
- turbidity increases - cloudier
- crystals increase
- casts decrease
- glucose decreases - RBCs utilize what glucose there is
6
Q
why does urine pH increase as the sample is left out at room temperature?
A
bacteria breaks down urea to ammonia (urine goes alkaline)
7
Q
why does glucose decrease as the sample is left out at room temperature?
A
RBCs utilize what glucose there is
