LOINC Code 11985-9: Fetal Head Circumference measured by ellipse overlay (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.measured.ellipse overlay

What it does not mean

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

Key facts

• Fetal Head Circumference measured by ellipse overlay (US)
• Perimeter
• Measured in same image as used for biparietal diameter measurement by imaging software ellipse
• Brain; by ellipse overlay; Circum; Circumference; Cranial; Cranium; Echoencephalogram; Echoencephalography; Echography; Fetal; Gyn; Gynecology; HC; Head Circumference; Intracranial; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; QNT; Quan; Quant; Quantitative; Random; Skull; 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