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Table 2 DGS 2018 referral guidelines. Adapted from [40]

From: Five regions, five retinopathy screening programmes: a systematic review of how Portugal addresses the challenge

Diabetic retinopathy screening result

Referral

R0

No disease visible

Repeats screening after a year

R1

Mild No Proliferative DR (NPDR)

Repeats screening after a year

R2

Moderate NPDR

CDTI 1, 2, 3 RD ophthalmologic consultation in a two-month period

R3

Severe NPDR

CDTI 2, 3 RD ophthalmologic consultation in 1 month period

Proliferative DR (PDR)

M1

Diabetic Macular Edema (DME)

V1

Hight risk PDR, vitreous haemorrhage, or tractional retinal detachment

CDTI 3 RD ophthalmologic consultation in a 15-day period

ICN

Inconclusive or comorbidities

General ophthalmology consultation

Treatment follow-uo

P0

Stable LASER

Repeats after a year

P1

Insufficient LASER

CDTI 1 (Thermic LASER)