What Is Actually in the Bag (Admixture Strength)
True strength of an IV bag after additions, counting overfill, volume withdrawn and additive volume.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Unit of the additive amount
- mg
- State the strength per mL (mL) or per liter
- Per mL
- Nominal bag volume
- 250 mL
- Overfill, from the manufacturer
- 25 mL
- Additions of the drug, one per line
- 500, 10
Result: 1.75439 mg/mL in a final volume of 285 mL.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Unit of the additive amount
- State the strength per mL (mL) or per liter (L)
- Nominal bag volume
- Overfill, from the manufacturer (blank if not known)
- Volume withdrawn before adding (optional)
- Additions of the drug, one per line: amount, then its volume in mL
- Other volume added that holds none of the drug (optional)
- Strength already in the bag fluid, in the strength unit chosen (optional)
- Target strength, in the strength unit chosen (optional)
How this is calculated
Citation
Arithmetic identity: final strength = amount in the bag ÷ final volume, where final volume = nominal + overfill − withdrawn + volumes added. Every number is the reader's; no overfill figure is supplied.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.