Question

1) Calculate the BSA of a woman who weighs 130 lb and is 5 ft 2 in tall 1) 2) An adult with a BSA of 2.12 m2 is to receive Mutamycin IV. The recommended dosage is 20 mg/m2. Calculate the dosage for this patient 2) 3) How many grams of pure antiseptic are needed to make 21 of a 2% solution 4) if you use 30g or Naci to make 750mL of solution, what percent concentration have you made? 5) Determine the exact amount of NaCl in 1500 mL of 0.9% NS. 5)

Answer 1

1. Weight of the woman = 130 lb = 130/22 = 59 kg

Height of the woman = 5 feet 2 inch = (5 x 30.48 ) + (2 x 2.54)

= 152.4 + 5.08 = 157.48 = 157.5 = 158 cm

BSA = $\sqrt{}$ (Height in cm x Weight in kg)$\div$ 3600

=$\sqrt{}$158 x 59 $\div$ 3600

= $\sqrt{}$ 9322 $\div$ 3600

= $\sqrt{}$ 2.58 = $\sqrt{}$ 2.6 = 1.6 m2

2. BSA = 2.12 meter square

Recommended dose = 20 mg/m2

Dosage for the given patient = 2.12 x 20 = 42.4 mg

3. (w/v)% of solution = 2 %

Grams of solute = a

Volume of solution = 2 l = 2 x 1000 = 2000 ml

( w/v ) % = (Grams of solute $\div$ Volume of solution )x 100

2 =( a $\div$ 2000 ml )x 100

a = (2000 x 2 )$\div$ 100 = 40g

Grams needed to make 2 L of a 2 % solution = 40 g

4.( w/v ) % = a

Volume of the solution = 750 ml

Grams of solute = 30 g

( w/v ) % = (Grams of solute $\div$ Volume of solution )x 100

= (30 g $\div$ 750) x 100

= 4 %

Percentage concentration made = 4 %

5.Amount of given NaCl = a

Volume of the solute = 1500 ml

(w/v) % = 0.9 % NS

( w/v ) % = (Grams of solute $\div$ Volume of solution )x 100

0.9 =( a $\div$ 1500) x 100

a = 13.5 grams

Amount of NaCl in 1500 ml of 0.9 % NS = 13.5 grams