# When will infusion complete?

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Theone40 has 7 years experience .

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Ok this problem is killing me, can't seem to figure out how to get the infusion time...thanks in advance for any help...

physician orders a Heparin drip at 2000 units per hour. Available you have in stock Heparin 25,000 units per 250 ml normal saline. Using micro drip tubing. The infusion was started at 0845.

what is the ml/hr ?

25000/250=100 u/ml

2000u/100u/ml = 20 ml/hr

what are the ggt/min ?

20 ml/hr x 60ggt/60min = 20ggt/min

When will the infusion be complete ?

250ml/20ml/hr = 12.5 hr

ok now this is where i get stuck ???

the answer that is written says

"drip starts at 0845 with 12.5 hrs. to infuse= 0845+12=2045 + .5 =2115"

how does this add up ?? to 2115 what am i missing....

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49 Posts; 4,358 Profile Views

It adds up. You're probably tired. Look again in the morning.

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49 Posts; 4,358 Profile Views

2045 + 0.5 (that means half an hour/30 mins) which would equal 21:15

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NICU Guy has 5 years experience as a BSN, RN and specializes in NICU.

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If it started at 0845 and ran for 12.5 hrs., it would finish at 9:15 pm. 9:15 in military time (24 hr system) would be 2115.

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Theone40 has 7 years experience.

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thanks... i don't know why it did not click that .5 is 1/2 hour......:)

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Esme12 is a ASN, BSN, RN and specializes in Critical Care, ED, Cath lab, CTPAC,Trauma.

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Sometimes our brains are just fried. ((HUGS))

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Theone40 has 7 years experience.

251 Posts; 10,287 Profile Views

I think my infusion times are still off or incorrect ? would love some feedback..... I think I'm stressing myself out

The physician orders Telavancin 30mg/hr. IV. Available: Telavancin 1g in 500ml NS. The drip is stated at 1030am. The drop rate factor is 60ggt/ml ?

What is the flow rate by IV ?

30mg/1000mg x 500ml = 15ml/hr

What is the ggt/min ?

15ml/hr x 60ggt/min x1h/60min = 15ggt/min

What time will the infusion be complete ?

500ml/15ml/hr =33.3 h

1030+33= 0730+.3 (.3x60min) =18min = 0748 infusion completion

Physician order is for heparin 20 units/kg. Patient weight is 165 lbs. Available is 20,000 units of heparin in 500ml of NS. The drop rate factor is 20ggt/ml. The heparin drip was started at 1600.

165lb= 75kg

20u/kg x 75kg =1500 u/kg

20,000u/500ml = 40 u/ml

What is the ml/hr ?

1500/40 =37.5 ml/hr

What is the gtt/min?

37.5ml/hr x 20ggt/min x 1h/60min =12.5 = 13ggt/min

When will the infusion be complete ?

500ml/37.5ml/hr=13.3h

1600+13=0500 +.3 (.3x60)=0518 completion

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KelRN215 has 10 years experience as a BSN, RN and specializes in Pedi.

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When the answer comes out as .33333 repeating, that's 1/3. 1/3 of an hr (60 min) is 20 min. For the first one, you need to consider military time. If an infusion starts at 10:30 (am) and takes 33.33 hours to complete, it's going to finish at 1950 the next day (24 hours to 10:30 the next day, then another 9.333 hours takes you to 19:50), not 0750. 0750 is 7:50 AM, 19:50 is 7:50 PM.

The second one looks right to me, but I'd call the answer 05:20.

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And it's not ggt for drop, it's gtt :) From the Latin gutta, "drop."

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by Guest

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thanks... i don't know why it did not click that .5 is 1/2 hour......:)
I can tell you exactly why it didn't "click."

It's because you didn't scrupulously use the units throughout your work.

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by Guest

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BTW, a good way to get comfortable with elapsed time is playing with Excel's number formats.

Excel stores a time value as a decimal number which can be converted to a fraction with a denominator of 24 (as in, 24 hours = 1 day). The format can be changed to display however you wish though the underlying whole-number value does not change.

Excel will also convert between fractions and decimals for you.

Part of numeracy comes from simply 'playing' with numbers and equations and, with calculators, spreadsheets, and Google, it's never been easier. For example, type "35 minutes in hours" in the Google search box

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Know whether your 24-hour clock uses 2400 or 0000 for midnight. The next minute is 0001 in both cases, but sometimes they use 24(00) for midnight and sometime 00(00). My kid in the maritime says they call the 8pm to midnight "the Cinderella watch" and midnight to 4am is the "balls to 04 watch." 00 = balls, get it?