POTASSIUM Flashcards
Potassium (K+)
Method
Turbidimetric
Potassium ions react with (?) to produce a colloidal suspension.
Sodium tetraphenyl boron
The turbidity of which is proportional to the potassium concentration in the range of (?).
2-7 mmol/L
Potassium (K+)
Store all reagents at (?).
room temperature
Potassium (K+)
All reagents are stable up to (?) on the individual bottle label.
expiration date
Potassium (K+)
Do not use if:
1. The reagent is
2. The reagent fails to achieve assigned values on
very cloudy
fresh control serum
Potassium (K+)
is recommended
Serum or Lithium-heparin plasma
Potassium (K+)
is also recommended
Plasma from anticoagulants not containing potassium
Potassium in serum is stable for at least
2 weeks at 2-8 °C
Specimens for serum potassium analysis should be free from
hemolysis
Potassium (K+)
Serum should be separated from the (?) shortly after collection.
red cells
Potassium (K+)
produce falsely elevated results
Turbid or icteric samples
Potassium (K+)
Bilirubin above (?) and Urea Nitrogen above (?) will produce elevated results.
40 mg/dL
80 mg/dL
Potassium (K+)
Sera containing high levels of (?) should be avoided.
ammonia
Potassium (K+)
Potassium reagent
BLANK
STANDARD
TEST
1.0 ml
Potassium (K+)
water
10 uL
Potassium (K+)
Potassium Standard
10 uL
Potassium (K+)
serum/plasma
10 uL
Potassium (K+)
Mix and allow to stand for (?) and measure absorbance of the standard and the test against reagent blank at (?).
3 minutes
500 nm
Potassium (K+)
Calculation:
Potassium (K+)
is the greatest source of error
Contaminated glassware
Potassium (K+)
Sample with values above (?) should be diluted (?), reassayed and the results to be multiplied by 2.
7 mmol/L
1:1 with NSS
Potassium (K+)
Normal Values:
3.4 – 5.3 mmol/L or 3.5 – 5.3 mEq/L
