Math

Question 1

Dr order: infuse 1500mL lactated ringers over 12hrs. Drip factor=15gtt/mL

Answer 1

1500/12=125mL/hr

125x15/60min=31gtt/min

Question 2

Dr order: 300mL ampicillin sodium 500mg infused over 40min. Drip factor=20gtt/mL

Answer 2

300/0.66=450mL/hr

450x20/60=150gtt/min

Question 3

Dr order: 50mL Zofran infused over 15min. Drip factor: 15gtt/mL

Answer 3

50/0.25=200mL/min

200x15/60=50ggt/min

Question 3

Rx: 50mg Tordol IM. Comes in 30mg/mL. How much to admin?

Answer 3

50/30x1=1.67mL

Question 4

Rx: Benadryl 100mg IM Q8h prn. Comes in 25mg/mL. How much to admin?

Answer 4

100/25x1=4mL

Question 5

Rx: Tylenol (acetaminophen)650mg PO bid for fever. Available: 325mg/tablet
How much to admin?

Answer 5

650/325x1=2 tabs

Question 6

Rx: Morphine 10mg PO qid 4/7. Available Morphine 20mg tablets. How much to admin?

Answer 6

10mg/20mgx1=0.5 tab

Question 7

gtts/min equation ?

Answer 7

(mL/hr x drop factor)/60min = gtts/min

Question 8

Pill formula?

Answer 8

dose ordered/dose on hand x amount on hand. = amount admin.

Question 9

Liquid formula?

Answer 9

dose ordered/dose on hand x amount in mLs to admin =V admin