Timing of First Eye Examination Based on Gestational Age at Birth
| Gestational Age at Birth, wk | Age at Initial Examination, wk | |
|---|---|---|
| Postmenstrual | Chronologic | |
| 22a | 31 | 9 |
| 23a | 31 | 8 |
| 24 | 31 | 7 |
| 25 | 31 | 6 |
| 26 | 31 | 5 |
| 27 | 31 | 4 |
| 28 | 32 | 4 |
| 29 | 33 | 4 |
| 30 | 34 | 4 |
| Older gestational age, high-risk factorsb | — | 4 |
Shown is a schedule for detecting prethreshold ROP with 99% confidence, usually before any required treatment. —, not applicable.
↵a This guideline should be considered tentative rather than evidence based for infants with a gestational age of 22 to 23 wk because of the small number of survivors in these postmenstrual age categories.
↵b Consider timing on the basis of the severity of comorbidities.