Maximum Contrast Dose Calculator

Estimate a maximum acceptable contrast volume for angiography using the Cigarroa formula — a study aid for contrast-nephropathy risk.

How it works

The Cigarroa formula estimates a maximum acceptable contrast dose as 5 mL × weight(kg) ÷ serum creatinine(mg/dL), commonly capped at 300 mL, to limit contrast-induced nephropathy risk. It is a teaching rule of thumb, not a substitute for clinical judgement. See patient-care questions.

Frequently asked questions

How do you calculate the maximum contrast dose?

The Cigarroa formula estimates it as 5 mL × weight(kg) ÷ serum creatinine(mg/dL), commonly capped at 300 mL.

Why limit contrast volume?

To reduce the risk of contrast-induced nephropathy, particularly in patients with impaired kidney function or diabetes.

Is the Cigarroa formula a strict limit?

No — it is an educational rule of thumb; clinical decisions follow institutional protocols and the patient's kidney function.