4.2 Reagent Strip testing (SG) Flashcards
Principle: pKa change of polyelectrolytes
What parameter is this?
Specific gravity
Reagent for Specific gravity in Reagent strips:
Ethylene glycol diaminoethyl ether tetraacetic acid
a. Multistix
b. Chemstrip
c. pH indicator
b
Reagent for Specific gravity in Reagent strips:
Polymethylvinyl ether maleic anhydride
a. Multistix
b. Chemstrip
c. pH indicator
a
Reagent for Specific gravity in Reagent strips:
Bromthymol blue
a. Multistix
b. Chemstrip
c. pH indicator
c
Color reaction and reading time for SG:
_____(Decrease SG)—> _______ –> _______(Increase SG)
a. Blue green Yellow
b. Green Blue Yellow
c. Blue Yellow Green
a
Color reaction and reading time for SG:
Reading time?
a. 45s
b. 43s
c. 42s
d. 35s
a
Sensitivity / Detection limit for SG?
1.000 - 1.030
Source of interference:
High concentration of protein
a. F-Increase
b. F-decrease
a
Source of interference:
Highly alkaline urine
a. F-Increase
b. F-decrease
b
NOTE:
When the pH is acidic, brothymol blue turns yellow and is associated with high specific gravity
* ↑ specific gravity = ↑ ionic content = ↑ free H+ ions = ↓ pH
pH <6.5 = +0.00__
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