What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 7771-9: Watermelon IgG Qn (S)

Name: LOINC Code 7771-9: Watermelon IgG Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:58.754Z

7771-9 is a LOINC code used to identify Watermelon IgG Qn (S) 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 Citrullus lanatus Ab.IgG. It is commonly used with the system or sample type Ser.

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 Citrullus lanatus Ab.IgG. It is commonly used with the system or sample type Ser.

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: Both

What it does not mean

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

Key facts

Watermelon IgG Ab [Units/volume] in Serum
Citrullus lanatus Ab.IgG
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Citrullus vulgaris; f029; f29; f329; Immune globulin G; Immunoglobulin G; Point in time; QNT; Quan; Quant; Quantitative; Random; Rf329; Serum; SR; Watermelon

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

Watermelon IgG Qn (S)Watermelon IgG Ab [Units/volume] in SerumWatermelon IgG QnCitrullus lanatus Ab.IgGALLERGYWatermelon IgG antibodyACnc

Frequently asked questions

Code details

Code7771-9

SystemLOINC

Display nameWatermelon IgG Qn (S)

DescriptionCitrullus lanatus Ab.IgG

Short nameWatermelon IgG Qn

ComponentCitrullus lanatus Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0h(2)

Last changed2.73

Consumer names

Watermelon IgG antibody

Part names

Citrullus lanatus Ab.IgGACncPtSerQnWatermelon (Citrullus lanatus) IgGArbitrary ConcentrationPoint in time (spot)Serum

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.