LOINCActiveObservation

LOINC Code 53665-6: Date of best overall gestational age estimate

53665-6 is a LOINC code used to identify Date of best overall gestational age estimate in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Date of best overall gestational age estimate. It is commonly used with the system or sample type ^Patient.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 Date of best overall gestational age estimate. It is commonly used with the system or sample type ^Patient.

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: Reported

What it does not mean

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

Key facts

  • Date of best overall gestational age estimate
  • Calendar date at which best overall assessment was used to determine gestational age.
  • Date best overall GA est; GA; Gest; Gestation; Gyn; Gynecology; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; Prenatal; QNT; Quan; Quant; Quantitative; Random

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

Date of best overall gestational age estimateDate best overall GA estOB.USDatePt^PatientQn

Frequently asked questions

Code details

Code53665-6
SystemLOINC
Display nameDate of best overall gestational age estimate
Short nameDate best overall GA est
ComponentDate of best overall gestational age estimate
PropertyDate
TimingPt
System (specimen)^Patient
ScaleQn
MethodReported
ClassOB.US
Example unitsMMDDYY
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.26
Last changed2.73

Part names

Date of best overall gestational age estimateDatePt^PatientQnReportedPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.