Gestational Age Abbreviation
The standard abbreviation for gestational age in pregnancy is "GA" 1.
Key Points About GA Terminology
According to the most recent 2025 Society of Radiologists in Ultrasound (SRU) consensus guidelines, gestational age should be:
- Abbreviated as "GA" in medical documentation
- Reported as number of weeks and number of days (e.g., "13 weeks 4 days GA")
- Used to describe the duration of pregnancy 1
Related Terminology
The guidelines clarify several related terms:
- Menstrual age: Based on the first day of last menstrual period (LMP) and/or early dating ultrasound
- Gestational duration: Alternative term for duration of pregnancy, particularly relevant in assisted reproductive technology where pregnancy is dated by clinical factors like intrauterine insemination or embryo transfer timing 1
Clinical Context
The first trimester is defined as GA ≤ 13 weeks 6 days 1. This standardized terminology was developed by a multi-society expert panel to ensure clear, scientifically-based, and medically appropriate language that minimizes bias and potential harm to patients and clinicians 1.
The abbreviation "GA" appears consistently throughout obstetric ultrasound reports, prenatal screening protocols 2, and clinical documentation to maintain standardization across healthcare settings.