LOINC Code 11818-2: Fetal Abdomen Diameter.anterior-posterior US

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Diameter.anterior-posterior. It is commonly used with the system or sample type Abdomen^Fetus.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Observation
• Method: US.measured

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Fetal Abdomen Diameter.anterior-posterior US
• Diameter.anterior-posterior
• Measured in the transaxial plane from outer to outer margin at level of umbilical vein. Umbilical portion of the left portal vein must not extend to the anterior abdominal wall and must be equidistant from the right and left sides of abdomen.
• Abd; Abd^Fetus; Abd+Fetus; Abdo; Abdomen+; Abdominal; APAD; DIA; Diam; Diam AP; Echography; Fetal; Gyn; Gynecology; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US+Meas

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Frequently asked questions