POTASSIUM

Question 1

Potassium (K+)

Method

Answer 1

Turbidimetric

Question 2

Potassium ions react with (?) to produce a colloidal suspension.

Answer 2

Sodium tetraphenyl boron

Question 3

The turbidity of which is proportional to the potassium concentration in the range of (?).

Answer 3

2-7 mmol/L

Question 4

Potassium (K+)

Store all reagents at (?).

Answer 4

room temperature

Question 5

Potassium (K+)

All reagents are stable up to (?) on the individual bottle label.

Answer 5

expiration date

Question 6

Potassium (K+)

Do not use if:
1. The reagent is
2. The reagent fails to achieve assigned values on

Answer 6

very cloudy

fresh control serum

Question 7

Potassium (K+)

is recommended

Answer 7

Serum or Lithium-heparin plasma

Question 8

Potassium (K+)

is also recommended

Answer 8

Plasma from anticoagulants not containing potassium

Question 9

Potassium in serum is stable for at least

Answer 9

2 weeks at 2-8 °C

Question 10

Specimens for serum potassium analysis should be free from

Answer 10

hemolysis

Question 11

Potassium (K+)

Serum should be separated from the (?) shortly after collection.

Answer 11

red cells

Question 12

Potassium (K+)

produce falsely elevated results

Answer 12

Turbid or icteric samples

Question 13

Potassium (K+)

Bilirubin above (?) and Urea Nitrogen above (?) will produce elevated results.

Answer 13

40 mg/dL

80 mg/dL

Question 14

Potassium (K+)

Sera containing high levels of (?) should be avoided.

Answer 14

ammonia

Question 15

Potassium (K+)

Potassium reagent

BLANK
STANDARD
TEST

Answer 15

1.0 ml

Question 16

Potassium (K+)

water

Answer 16

10 uL

Question 17

Potassium (K+)

Potassium Standard

Answer 17

10 uL

Question 18

Potassium (K+)

serum/plasma

Answer 18

10 uL

Question 19

Potassium (K+)

Mix and allow to stand for (?) and measure absorbance of the standard and the test against reagent blank at (?).

Answer 19

3 minutes

500 nm

Question 20

Potassium (K+)

Calculation:

Question 21

Potassium (K+)

is the greatest source of error

Answer 21

Contaminated glassware

Question 22

Potassium (K+)

Sample with values above (?) should be diluted (?), reassayed and the results to be multiplied by 2.

Answer 22

7 mmol/L

1:1 with NSS

Question 23

Potassium (K+)

Normal Values:

Answer 23

3.4 – 5.3 mmol/L or 3.5 – 5.3 mEq/L