Risk of Malignancy Index (RMI I/II/III)
Risk of Malignancy Index (RMI = U × M × CA-125) from the ultrasound-feature count, menopausal status, and CA-125; an RMI over 200 is the conventional high-risk threshold.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- RMI variant
- RMI I (Jacobs 1990)
- Multilocular cyst
- Yes
- Solid areas
- Yes
- Ascites
- Yes
- Postmenopausal
- Yes
- CA-125
- 80 U/mL
Result: RMI 1 = U(3) x M(3) x CA-125(80) = 720: high risk (over 200).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- U / M scaling
- RMI I: U 0/1/3, M pre 1 post 3. RMI II: U 1/4, M pre 1 post 4. RMI III: U 1/3, M pre 1 post 3.
- > 200
- conventional high-risk threshold prompting gyn-oncology referral.
What you enter
- RMI variant (I / II / III)
- Multilocular cyst
- Solid areas
- Bilateral lesions
- Ascites
- Intra-abdominal metastases
- Postmenopausal
- CA-125
How this is calculated
- Formula
- RMI = U x M x CA-125 (U/mL); features = multilocular cyst, solid areas, bilateral, ascites, metastases.
Jacobs I, Oram D, Fairbanks J, Turner J, Frost C, Grudzinskas JG. A risk of malignancy index incorporating CA 125, ultrasound and menopausal status for the accurate preoperative diagnosis of ovarian cancer. Br J Obstet Gynaecol. 1990;97(10):922-929; II/III per Tingulstad 1996/1999. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.