Gynecology

Reid's Colposcopic Index (RCI) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Margin of the acetowhite lesion

Color of acetowhitening

Vessels

Iodine staining (Lugol's solution)

Score iodine last. Mustard-yellow rejection scores 2 only if margin, color and vessels total 3 or more; otherwise it scores 0.

Result

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Primary source

Ferris DG, Greenberg MD. Reid's colposcopic index. J Fam Pract. 1994;39(1):65-70. PMID: 7517993. Four signs are each scored 0 to 2. Margin: 0 condylomatous or micropapillary contour, indistinct or feathered borders, jagged or angular outline, or satellite lesions; 1 smooth, fairly straight outline; 2 raised, peeling edges or an internal border within a larger low-grade lesion. Color of acetowhitening: 0 shiny, semitransparent snow-white; 1 intermediate or off-white; 2 dense, dull oyster-gray. Vessels: 0 fine, nondilated capillaries in punctation or mosaic; 1 no surface vessels; 2 coarse, dilated punctation or mosaic. Iodine (Lugol's, scored last): 0 mahogany-brown uptake; 1 variegated, tortoise-shell partial uptake; 2 mustard-yellow rejection only when the first three signs total 3 or more, otherwise rejection scores 0. Total 0-2 predicts HPV or CIN I, 3-5 CIN I or II, 6-8 CIN II or III. Worked cases: margin 0, color 1, vessels 0 with iodine rejection totals 1; margin 1, color 1, vessels 2 with iodine rejection totals 6. Original index: Reid R, Scalzi P, Am J Obstet Gynecol 1985. (1994)

Scope: Acetowhite cervical lesions seen at colposcopy after an abnormal screening test. It predicts the likely histologic grade and does not replace biopsy; the later IARC modified version with 3-4 and 5-8 bands is not used here.

Last reviewed 2026-10-18

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Ferris DG, Greenberg MD. Reid's colposcopic index. J Fam Pract. 1994;39(1):65-70. PMID: 7517993. Four signs are each scored 0 to 2. Margin: 0 condylomatous or micropapillary contour, indistinct or feathered borders, jagged or angular outline, or satellite lesions; 1 smooth, fairly straight outline; 2 raised, peeling edges or an internal border within a larger low-grade lesion. Color of acetowhitening: 0 shiny, semitransparent snow-white; 1 intermediate or off-white; 2 dense, dull oyster-gray. Vessels: 0 fine, nondilated capillaries in punctation or mosaic; 1 no surface vessels; 2 coarse, dilated punctation or mosaic. Iodine (Lugol's, scored last): 0 mahogany-brown uptake; 1 variegated, tortoise-shell partial uptake; 2 mustard-yellow rejection only when the first three signs total 3 or more, otherwise rejection scores 0. Total 0-2 predicts HPV or CIN I, 3-5 CIN I or II, 6-8 CIN II or III. Worked cases: margin 0, color 1, vessels 0 with iodine rejection totals 1; margin 1, color 1, vessels 2 with iodine rejection totals 6. Original index: Reid R, Scalzi P, Am J Obstet Gynecol 1985. (1994)

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Clinical inputs

Margin of the acetowhite lesion
Color of acetowhitening
Vessels
Iodine staining (Lugol's solution)

Primary source

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