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LOINC Code 16638-9: C. immitis IgG Qn (CSF)

16638-9 is a LOINC code used to identify C. immitis IgG Qn (CSF) 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 Coccidioides immitis Ab.IgG. It is commonly used with the system or sample type CSF.

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 Coccidioides immitis Ab.IgG. It is commonly used with the system or sample type CSF.

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

  • Coccidioides immitis IgG Ab [Units/volume] in Cerebral spinal fluid
  • Coccidioides immitis Ab.IgG
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; B immitis; Blastomycoides immitis; C esteriformis; C immitis; Cerebral spinal fluid; Cerebrospinal Fl; Coccidioides esteriformis; Coccidiomycosis; Coccio; G immite; G louisianoideum; G metaeuropea; Geotrichum immite; Glenospora metaeuropea; Glenosporum louisianoideum; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; P esteriformis; P mazzai; Point in time; Posadasia esteriformis; Pseudococcidioides mazzai; QNT; Quan; Quant; Quantitative; Random; San Joaquin Valley fever; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; T proteolyticum; Trichosporon proteolyticum; Valley fever

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

C. immitis IgG Qn (CSF)Coccidioides immitis IgG Ab [Units/volume] in Cerebral spinal fluidC immitis IgG CSF-aCncCoccidioides immitis Ab.IgGMICROCoccidioides immitis IgG antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code16638-9
SystemLOINC
Display nameC. immitis IgG Qn (CSF)
DescriptionCoccidioides immitis Ab.IgG
Short nameC immitis IgG CSF-aCnc
ComponentCoccidioides immitis Ab.IgG
PropertyACnc
TimingPt
System (specimen)CSF
ScaleQn
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Coccidioides immitis IgG antibody, Spinal fluid

Part names

Coccidioides immitis Ab.IgGACncPtCSFQnCoccidioides immitis IgGArbitrary ConcentrationPoint in time (spot)Cerebral spinal fluid

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 16638-9 | HealthAssure