Reconstitute to Final Bag
Calculate final bag concentration after reconstituting a vial and adding part of the solution to an infusion bag.
Calculator
Use the **final vial volume** after reconstitution (label/monograph).
Use the volume your policy uses for the final concentration check.
Educational use only. Always verify against product information and local policy.
How it works
This is a two-stage process: first you reconstitute the vial to obtain a vial concentration (mg/mL). Then you withdraw a volume from the vial and add it to an infusion bag.
The calculator performs three steps: (1) vial concentration, (2) mg withdrawn/added, (3) final bag concentration (mg/mL).
Formula
Worked examples
Example 1: 1000 mg vial, reconstitute to 10 mL, withdraw 5 mL, add to 250 mL bag
Example 2: 500 mg vial, reconstitute to 5 mL, withdraw 2 mL, add to 100 mL bag
Example 3: 750 mg vial, reconstitute to 15 mL, withdraw 6 mL, add to 500 mL bag
When this calculator is used
- •Reconstituting powder vials (e.g., antibiotics, chemo) and adding to infusion bags
- •Two-stage dilution checks prior to administration
- •Standardizing final infusion concentrations for protocols
- •Education/training and double-checking calculations
Clinical safety note: Use the diluent and volumes specified on product information and follow local policy. Always verify final concentration before administration.
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Frequently asked questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.