Calculator
CT Contrast Dose Calculator
Estimate CT contrast volume and iodine load from patient weight, dose protocol, contrast concentration, and maximum volume.
Calculator Inputs
Legend
CT Contrast Dose Calculator guidance
Contrast volume = patient weight x protocol mL/kg, capped at maximum volume. Iodine load = volume x iodine concentration.
Input meaning
- Patient weight: enter the measured, quoted, or hospital-approved value in kg.
- Protocol dose: enter the measured, quoted, or hospital-approved value in mL/kg.
- Maximum contrast volume: enter the measured, quoted, or hospital-approved value in mL.
- Iodine concentration: enter the measured, quoted, or hospital-approved value in mg I/mL.
Result interpretation
- Use the result as a planning estimate, not as a final approval by itself.
- Record the assumptions used so Procurement, Biomedical, Facilities, Finance, and vendors can review the same basis.
Assumptions
- Clinical contrast dosing must follow radiologist-approved protocol and patient renal/allergy screening.
- This tool is for planning and procurement examples, not individual patient prescribing.
Biomedical use
- Use this calculator during RFQ preparation, technical evaluation, acceptance planning, service review, or biomedical workload planning.
How to identify the required values
Use these examples and common working ranges to choose values from gauges, labels, manuals, datasheets, RFQs, service reports, CMMS records, or hospital planning assumptions.
| Field | Example value | Common range | Tip |
|---|---|---|---|
| Patient weight | Example: 70 kg. | Use actual patient weight for clinical dosing examples; procurement demos often model 70 kg adult cases. | Use actual patient weight for clinical examples. |
| Protocol dose | Example: 1.5 mL/kg. | Many adult CT protocols use about 1-2 mL/kg, with department-specific caps. | Use the radiology-approved contrast protocol, not a vendor brochure value. |
| Maximum contrast volume | Example: 120 mL. | Many adult CT protocols cap around 100-150 mL, depending on exam and policy. | Use the radiology department protocol cap. |
| Iodine concentration | Example: 350 mg I/mL. | Common iodinated contrast concentrations are around 300-370 mg I/mL. | Use the contrast bottle concentration. |
Common ranges are starting points for hospital planning. For final procurement, acceptance testing, electrical design, medical gas design, radiation shielding, dialysis water systems, or clinical use, replace the example values with site-specific data and vendor-confirmed figures.
Input Checklist
Confirm these values before relying on the output for procurement, PM, or service planning.
- Patient weight
- Protocol dose
- Maximum volume
- Iodine concentration
Safety And Engineering Notes
Use calculator outputs as planning estimates and verify critical systems with calibrated measurement or qualified engineering review.
- Clinical contrast dosing must follow radiologist-approved protocol and patient renal/allergy screening.
- This tool is for planning and procurement examples, not individual patient prescribing.
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