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LOINC Code 17635-4: S. pneumoniae Danish type 18C IgG Qn (S)

17635-4 is a LOINC code used to identify S. pneumoniae Danish type 18C 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 Streptococcus pneumoniae Danish serotype 18C Ab.IgG. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Streptococcus pneumoniae Danish serotype 18C 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

  • Streptococcus pneumoniae Danish serotype 18C IgG Ab [Units/volume] in Serum
  • Streptococcus pneumoniae Danish serotype 18C Ab.IgG
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; PCV13; PCV7; Pneu; pneum; Pneumo; Pneumococ; Pneumococcal; Pneumococcal pneumonia; Pneumococcus; Pneumon; Pneumonia; Point in time; PPSV23; QNT; Quan; Quant; Quantitative; Random; S pneum Da 18C; S pneum Da 18C Ab; S pneum Da 18C IgG; S pneum Da type; S pneumo; S pneumoniae; Serum; Spn; SR; Strep; Strept; U.S. serotype 56

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

S. pneumoniae Danish type 18C IgG Qn (S)Streptococcus pneumoniae Danish serotype 18C IgG Ab [Units/volume] in SerumS pneum Da 18C IgG Ser-aCncStreptococcus pneumoniae Danish serotype 18C Ab.IgGMICROStreptococcus pneumoniae Danish serotype 18C IgG antibody, BloodACnc

Frequently asked questions

Code details

Code17635-4
SystemLOINC
Display nameS. pneumoniae Danish type 18C IgG Qn (S)
DescriptionStreptococcus pneumoniae Danish serotype 18C Ab.IgG
Short nameS pneum Da 18C IgG Ser-aCnc
ComponentStreptococcus pneumoniae Danish serotype 18C Ab.IgG
PropertyACnc
TimingPt
System (specimen)Ser
ScaleQn
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.73

Consumer names

Streptococcus pneumoniae Danish serotype 18C IgG antibody, Blood

Part names

Streptococcus pneumoniae Danish serotype 18C Ab.IgGACncPtSerQnStreptococcus pneumoniae Danish serotype 18C 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.

LOINC Code 17635-4 | HealthAssure