Calculations Flashcards
How many milliequivalents of sodium are in 1 mL of 8.4% sodium bicarbonate? (M.W. = 84) (Answer must be numeric; no units or commas.)
1
Using 10 grams of a 15% boric acid ointment, the pharmacist will manufacture a 12% ointment. How many milligrams of diluent is required? (Answer must be numeric; no units or commas; round final answer to the nearest WHOLE number.)
2500mg
Calculate the corrected calcium for a patient with the following lab values. (Answer must be numeric; no units or commas; round final answer to the nearest TENTH.)
Labs:
WBC (cells/mm3) = 10.2 (4 – 11 x 103)
Hgb (g/dL) = 13.3 (13.5 – 18 male)
Hct (%) = 38.2 (38 – 50 male)
Plt (cells/mm3) = 342 (150 – 450 x 103)
Albumin (g/dL) = 1.7 (3.5 – 5)
AST (IU/L) = 56 (10 – 40)
ALT (IU/L) = 42 (10 – 40)
A1C (%) = 8.5
Na (mEq/L) = 142 (135 – 145)
K (mEq/L) = 3.5 (3.5 – 5)
Cl (mEq/L) = 101 (95 – 103)
HCO3 (mEq/L) = 25 (24 – 30)
BUN (mg/dL) = 13 (7 – 20)
SCr (mg/dL) = 1.5 (0.6 – 1.3)
Glucose (mg/dL) = 129 (100 – 125)
Ca (mg/dL) = 8.1 (8.5 – 10.5)
Mg (mEq/L) = 1.1 (1.3 – 2.1)
PO4 (mg/dL) = 4.8 (2.3 – 4.7)
9.9
If 1 gallon of a 15% (w/v) solution is evaporated to a solution with a 40% (w/v) strength, what will be the new volume (in milliliters)? Use 1 gallon = 3,785 mL. (Answer must be numeric; no units or commas; round final answer to the nearest WHOLE number.)
1419
Calculate the anion gap for a patient with the following lab values: (Answer must be numeric; no units or commas.)
Labs:
WBC (cells/mm3) = 2.3 (4 – 11 x 103)
Hgb (g/dL) = 14.5 (12 – 16 female)
Hct (%) = 43.4 (36 – 46 female)
Plt (cells/mm3) = 342 (150 – 450 x 103)
PMNs = 32%
Bands = 5%
Na (mEq/L) = 132 (135 – 145)
K (mEq/L) = 4.0 (3.5 – 5)
Cl (mEq/L) = 100 (95 – 103)
HCO3 (mEq/L) = 18 (24 – 30)
BUN (mg/dL) = 18 (7 – 20)
SCr (mg/dL) = 1.4 (0.6 – 1.3)
Glucose (mg/dL) = 276 (100 – 125)
Ca (mg/dL) = 9.8 (8.5 – 10.5)
Mg (mEq/L) = 1.3 (1.3 – 2.1)
PO4 (mg/dL) = 4.2 (2.3 – 4.7)
Answer
Anion gap=Na-(Cl-HCO3)
HCO3 is also CO2 in the Chem-7
14
A patient has the following white blood cell differential:
WBC = 6,200 cells/mm3 Segs = 14% Bands = 7%
Calculate the absolute neutrophil count. (Answer must be numeric; no units or commas.)
ANC=WBC+neutrophils
Neutrophils=(%segs +% bands)
1302
Phosphate and calcium can precipitate in a PN bag and cause a pulmonary embolus. Which of the following methods can help reduce this risk?
Answer
A
Keeping the pH above 6
B
Choosing calcium chloride over calcium gluconate
C
The calcium and phosphate added together should not exceed 45 mEq/L
D
Keeping the calcium:phosphorus ratio less than 1:2
E
Infusing the PN within four days of preparation
C
The calcium and phosphate added together should not exceed 45 mEq/L
A patient is taking 2 calcium citrate tablets once daily. Each weighs 1,500 mg total (non-elemental) weight. She wishes to trade her calcium tablets for the carbonate form. How many 800 mg carbonate tablets (by weight) will she need to provide the same daily dose? (Answer must be numeric; no units or commas; round final answer to the nearest WHOLE tablet.)
2
Refer to p. 76 of the 2016 RxPrep Course Book.
Know:
Ca Carbonate has the most amount of elemental calcium = 40%
Ca Citrate: 21%
Ca Acetate: 25% ( NOT FOR SUPPLEMENTATION, IT IS PHOSPHATE BINDER)
Using 10 grams of a 15% boric acid ointment, the pharmacist will manufacture an 8% ointment. How many grams of diluent is required? (Answer must be numeric; no units or commas; round final answer to the nearest TENTH.)
8.8
Calculate the body mass index (BMI) for a female who is 5’4” tall and weighs 180 pounds. (Answer must be numeric; no units or commas; round final answer to the nearest WHOLE number.)
31
Know BMI formula for inches and lbs:
lbs/inches2 x 703
A 10 mL vial is labeled potassium chloride (2 mEq/mL). How many grams of potassium chloride are present? (M.W. of KCl = 74.5) (Answer must be numeric; no units or commas; include a leading zero if answer is less than 1.)
1.49 grams
Here: KCL 20 mEq = 20 mmols
The pharmacist is asked to prepare one liter of 10% sodium bicarbonate solution. She only has a 1% solution and a 20% solution in stock. How many milliliters of the 1% solution will be required to compound this prescription? (Answer must be numeric; no units or commas; round final answer to the nearest WHOLE number.)
526
Choose the correct indications for parenteral nutrition (PN) therapy. (Select ALL that apply.)
Answer
A
Severe gut dysfunction due to various conditions, such as Crohn’s disease, ulcerative colitis, obstruction and short bowel syndrome from surgery.
B
Patients requiring long-term supplemental nutrition because they are unable to receive daily requirements through oral or enteral feedings.
C
A patient who will be NPO for three full days secondary to surgery.
D
All patients in the ICU.
E
A patient with mild acute pancreatitis.
Incorrect
PN indications include severe gut dysfunction due to various conditions and patients requiring long-term supplemental nutrition because they are unable to receive daily requirements through oral or enteral feedings.
A
Severe gut dysfunction due to various conditions, such as Crohn’s disease, ulcerative colitis, obstruction and short bowel syndrome from surgery.
B
Patients requiring long-term supplemental nutrition because they are unable to receive daily requirements through oral or enteral feedings.
A parent brings a 6-year-old boy to the Emergency Department. Labs are ordered and an ABG is drawn. The ABG results are as follows: 7.24/53/99/26/98. What acid base disorder does the child have?
Answer
A Metabolic acidosis B Metabolic alkalosis C Respiratory acidosis D Respiratory alkalosis
C
Respiratory acidosis
Refer to pages 76-77 of the 2018 RxPrep Course Book. Refer to the Lab Values & Drug Monitoring chapter for the reference ranges of the ABG components.
The pharmacy receives a prescription for 100 grams of 5% hydrocortisone ointment. The pharmacy has a 10% hydrocortisone ointment and a 2.5% hydrocortisone ointment available. Using only these products, how many grams of the 2.5% ointment should be used to compound this prescription? (Answer must be numeric; no units or commas; include a leading zero when answer is less than 1; round final answer to the nearest one decimal place.)
66.7
