LABORATORY MATHEMATICS

Question 1

Most common type of solution prepared in clinical laboratory
Refers to the number of grams of solute per 100 mL of solution

Answer 1

Weight/Volume (w/v) % solutions

Question 2

Formula for w/v%

Answer 2

w/v% = [weight of solute (g)/ volume of solution (mL)] x 100

Question 3

Used when both solute and solvents are liquid
Refers to the amount of solute in mL in 100 mL of solvent

Answer 3

Volume/Volume (v/v)% solutions

Question 4

Formula of (v/v)%

Answer 4

v/v% = [volume of solute (mL)/ volume of solution (mL)] x 100

Question 5

Number of grams of solute per 100 grams of solution

Answer 5

Weight/Weight (w/w)% solutions

Question 6

Formula of w/w%

Answer 6

w/w% = [(mass of solute in g/ mass of solution in g)] x 100

Question 7

Number of moles of solute per liter of solution

Answer 7

Molarity

Question 8

Formula of Molarity

Answer 8

M = moles of solute (mol)/ Liters of solution (L)

Question 9

To prepare a molar solution

Answer 9

Grams of solute = Molarity x GMW of the solute x Volume (L)

Question 10

To convert %w/v to Molarity

Answer 10

M = %w/v x 10 /GMW

Question 11

Number of equivalent weight of solute per liter of solution
Often been used in acid-base calculations

Answer 11

Normality = Grams of solute/ EW x Volume (L)

Question 12

Formula of Equivalent Weight

Answer 12

EW = MW/valence

Question 13

To prepare a normal solution of Solids

Answer 13

Grams of solute = EW x Normality x Volime (L)

Question 14

To convert %w/v to Normality (N)

Answer 14

N = %w/v x 10 / EW

Question 15

Formula of Normality

Answer 15

Normality = Molarity x Valence

Question 16

Formula of Molarity from Normality

Answer 16

Molarity = Normality

Question 17

Amount of solute per 1 kilogram of solvent
Expressed in terms of weight/weight or moles per kilogram

Answer 17

Molality

Question 18

Formula of Molality

Answer 18

Molality = grams of solute/ MW x kg of solvent

Question 19

Formula of Mean

Answer 19

Mean = Sum of All Data Points/ Numberof Data Points

Question 20

Formula of SD

Answer 20

SD = sqrt.// (Sum of ((Xi - Mean)) squared / Number of Values in data set//

Question 21

Dilution Formula

Answer 21

Dilution = Volume of solute/ Volume of solution

Question 22

Temperature Conversion
C to K

Answer 22

C + 273

Question 23

Temperature Conversion
C to F

Answer 23

(C x 1.8) + 32

Question 24

Temperature Conversion
F to C

Answer 24

(F - 32) x 0.556

Question 25

Conversion Factor:
Albumin

Answer 25

10

Question 26

Conversion Factor:
Ammonia

Answer 26

0.587

Question 27

Conversion Factor:
Bicarbonate

Answer 27

1.0

Question 28

Conversion Factor:
Bilirubin

Answer 28

17.1

Question 29

Conversion Factor:
BUN

Answer 29

0.357

Question 30

Conversion Factor:
Calcium

Answer 30

0.25

Question 31

Conversion Factor:
Chloride

Answer 31

1.0

Question 32

Conversion Factor:
Cholesterol

Answer 32

0.026

Question 33

Conversion Factor:
Creatinine

Answer 33

88.4

Question 34

Conversion Factor:
Glucose

Answer 34

0.0555

Question 35

Conversion Factor:
Iron

Answer 35

0.179

Question 36

Conversion Factor:
Lithium

Answer 36

1.0

Question 37

Conversion Factor:
Magnesium

Answer 37

0.5

Question 38

Conversion Factor:
Phospholipid

Answer 38

0.01

Question 39

Conversion Factor:
Phosphorus

Answer 39

0.323

Question 40

Conversion Factor:
Potassium

Answer 40

1.0

Question 41

Conversion Factor:
Sodium

Answer 41

1.0

Question 42

Conversion Factor:
Thyroxin

Answer 42

12.9

Question 43

Conversion Factor:
Total Protein

Answer 43

10

Question 44

Conversion Factor:
Triglyceride

Answer 44

0.0113

Question 45

Conversion Factor:
Uric Acid

Answer 45

0.0595

Question 46

Conversion Factor:
pCO2

Answer 46

0.133

Question 47

Conversion Factor:
pO2

Answer 47

0.133