LOINC Code 11982-6: Fetal Head Circumference derived from occipital-frontal diameter and outer-outer transaxial diameter (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 Perimeter. It is commonly used with the system or sample type Head^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.derived from OFD&O-O TD

What it does not mean

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

Key facts

• Fetal Head Circumference derived from occipital-frontal diameter and outer-outer transaxial diameter (US)
• Perimeter
• Derived from measures of occipital-frontal diameter and transaxial diameter assuming shape is an ellipse. The outer to outer transaxial diameter is used. This estimate should be closer to that measured with ellipse overlay or by tracing.
• Brain; by OFD+O-O TD; Circum; Circumference; Cranial; Cranium; der US; Echoencephalogram; Echoencephalography; Echography; Fetal; Gyn; Gynecology; HC; Head Circumference; Intracranial; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Occipital-Frontal Diameter; Occipital-Frontal Diameter & Outer to Outer head diameter; Occipital-Frontal Diameter & Outer to Outer Tympanum diameter; Outer to Outer Tympanum Diameter; Point in time; QNT; Quan; Quant; Quantitative; Random; Skull; Sonogram; Sonograph; Sonography; Transaxial Diameter; ULS; Ultrasound

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