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Medical Abbreviations Starting With "Y"
This page lists 12 medical abbreviations starting with "Y", each with its full form and a plain-English meaning. Where one abbreviation has more than one common meaning, each meaning has its own row — context in the chart is what tells them apart. Terms flagged ⚠ Error-prone are on recognised error-prone lists and should be written out in full. Use the filter box to narrow this list, the search on the main guide to search all 5,715 entries, or jump to another letter:
A B C D E F G H I J K L M N 0–9 O P Q R S T U V W X Z
| Abbreviation | Full form | What it means | Used in |
|---|---|---|---|
| Y-90 | yttrium-90 | Radioactive particles used in liver tumor embolization | Hematology & Oncology Radiology & Imaging |
| Y-BOCS | Yale-Brown Obsessive Compulsive Scale (score) | OCD severity scale — score | Psychiatry |
| YAG | yttrium aluminum garnet laser | Laser used for capsule and iris procedures | General Medical Surgery Radiology & Imaging |
| YAG cap | YAG capsulotomy | Laser opening of a cloudy lens capsule | Surgery |
| YAG PI | YAG peripheral iridotomy | Laser hole in the iris for narrow angles | Surgery |
| YEARS | YEARS criteria | Simplified PE diagnostic algorithm | Emergency & Critical Care Respiratory |
| YFV | yellow fever virus | Mosquito-borne virus prevented by vaccine | Infectious Disease Laboratory |
| YMRS | Young Mania Rating Scale | Clinician rating scale for mania severity | Psychiatry |
| YO | years old | Age of a patient in years | General Medical Pediatrics |
| Yo ab | anti-Yo antibody (paraneoplastic) | Cerebellar paraneoplastic antibody | Neurology Laboratory |
| YS | yolk sac (ultrasound) | Early pregnancy structure inside the sac | Obstetrics & Gynecology Radiology & Imaging |
| YSR | Youth Self Report | Achenbach self-report behavior scale | Pediatrics Psychiatry |
Educational reference only. This guide is for learning and quick reference. Abbreviations vary between hospitals, countries and specialties, and some are discouraged because they can be misread. Always write and interpret orders using your own institution’s approved abbreviation list, and check anything unclear with the prescriber or your local policy.