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 35550-3: Phthalic anhydride IgG (S) [Mass/Vol]

Name: LOINC Code 35550-3: Phthalic anhydride IgG (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:23.498Z

35550-3 is a LOINC code used to identify Phthalic anhydride IgG (S) [Mass/Vol] 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 Phthalic anhydride 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 Phthalic anhydride 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

Phthalic anhydride IgG Ab [Mass/volume] in Serum
Phthalic anhydride Ab.IgG
1,2-benzenedicarboxylic acid anhydride; 1,2-benzenedicarboxylic anhydride; 1,3-dioxophthalan; 1,3-isobenzofurandione; 1,3-phthalandione; ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Anhydrid; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Immune globulin G; Immunoglobulin G; k79; Level; Mass concentration; PAN; Phthalandione; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR

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

Phthalic anhydride IgG (S) [Mass/Vol]Phthalic anhydride IgG Ab [Mass/volume] in SerumPAN IgG-mCncPhthalic anhydride Ab.IgGALLERGYPhthalic anhydride IgG antibodyMCnc

Frequently asked questions

Code details

Code35550-3

SystemLOINC

Display namePhthalic anhydride IgG (S) [Mass/Vol]

DescriptionPhthalic anhydride Ab.IgG

Short namePAN IgG-mCnc

ComponentPhthalic anhydride Ab.IgG

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

Example unitsug/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.13

Last changed2.73

Consumer names

Phthalic anhydride IgG antibody

Part names

Phthalic anhydride Ab.IgGMCncPtSerQnPhthalic anhydride IgGMass 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.