Calculator Inputs
Formula Used
Total dose g = weight kg × ordered dose g/kg.
Grams per mL = solution strength percent ÷ 100.
Product volume mL = total dose g ÷ grams per mL.
Hourly pump rate = rate mL/kg/hr × weight kg.
Effective maximum rate = lower of protocol maximum and pump cap ÷ weight.
Volume per step = pump rate mL/hr × step minutes ÷ 60.
Drops per minute = pump rate mL/hr × drop factor ÷ 60.
The calculator repeats each step until the target run volume is delivered. The final step is shortened when only a partial volume remains.
How to Use This Calculator
- Enter the patient weight in kilograms.
- Enter the ordered IVIG dose for this infusion.
- Enter the product strength as a percent value.
- Add the starting rate, rate increase, and maximum rate.
- Enter the step duration used by the order or protocol.
- Add a pump cap when the device or policy limits mL/hr.
- Press calculate and review the result above the form.
- Download the CSV or PDF only after clinical verification.
Example Data Table
| Case | Weight kg | Dose g/kg | Strength | Start Rate | Max Rate | Expected Product Volume |
|---|---|---|---|---|---|---|
| Adult replacement | 70 | 0.4 | 10% | 0.5 | 4 | 280 mL |
| Adult high dose | 80 | 1 | 10% | 0.5 | 3 | 800 mL |
| Pediatric example | 25 | 0.5 | 5% | 0.25 | 2 | 250 mL |
IVIG Rate Planning Guide
IVIG therapy needs careful rate planning. The dose is usually ordered by body weight. The pump rate is then built from the chosen step rate. This calculator helps turn those values into a clear schedule. It can estimate dose, product volume, rate caps, elapsed time, and vial needs. It also gives a row by row ramp plan. Each row shows the rate, pump setting, minutes, and delivered volume.
Why the Rate Matters
Infusion speed affects comfort and safety. A slow first step gives staff time to watch for chills, headache, flushing, back pain, or other reactions. If the patient tolerates the step, the next step can be higher. This tool does not replace a protocol. It only checks the arithmetic behind the order. Always compare the results with the product leaflet, local policy, and the prescriber order.
Useful Inputs
Start with an accurate weight in kilograms. Enter the ordered dose in grams per kilogram. Choose the IVIG strength as percent weight per volume. For example, a 10 percent solution contains 10 grams in 100 mL. Enter the starting rate, step increase, maximum allowed rate, and step duration. Add a pump cap when the pump or policy limits mL per hour.
Reading the Output
The total dose shows grams required for the patient. The product volume shows how many milliliters contain that dose. The effective maximum rate shows the lower value after comparing the protocol cap and pump cap. The schedule then estimates how long each step will run. The final line may be shorter than a full step because the target volume is almost complete.
Practical Checks
Review every number before administration. Check that weight, units, concentration, and dose match the order. Confirm whether the patient is new to IVIG, changing brands, or returning after a long gap. Those situations may need a slower schedule. Use conservative values for patients with risk factors when the clinical protocol requires them. Keep records with the order sheet. Save the table for review. The CSV file helps audits. The PDF report helps handoff notes. These exports should never be the only source of truth. They are calculation aids for trained clinical users. Use them only when policy allows it.
FAQs
1. What does this calculator estimate?
It estimates dose, product volume, pump rate steps, delivery time, drops per minute, and vial count. It is a calculation aid, not a prescribing tool.
2. Can I use one maximum rate for every IVIG brand?
No. Maximum rates vary by product, patient risk, and local policy. Enter the exact maximum rate from the approved order or protocol.
3. What does solution strength percent mean?
It is grams per 100 mL. A 10 percent solution contains 10 grams in 100 mL, or 0.1 gram per mL.
4. Why is my final step shorter?
The calculator shortens the last step when the remaining volume is less than a full step volume. This prevents overestimating the run volume.
5. What is the pump cap field?
It is the highest pump setting allowed in mL/hr. Use zero only when no separate pump cap applies.
6. Does the vial count replace pharmacy preparation?
No. Vial count is only an estimate from prepared volume and vial size. Pharmacy procedures, overfill, rounding, and product availability may differ.
7. Why add already infused volume?
Use it when an infusion was paused or restarted. The calculator subtracts that amount from the remaining target run volume.
8. Who should verify the result?
A qualified clinical professional should verify the order, patient identity, product, dose, concentration, pump setting, and escalation schedule before infusion.