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Reference Laboratory
Tests 		 
-95
GAD Antibody (See Glutamic Acid Decarboxylase) print

 
-96
Ganciclovir, Susceptibility Testing (See Antiviral Susceptibility, Ganciclovir) print

 
2501
Ganglioside Antibody Panel, ELISA (Serum) print

See individual assay for description.

Panel Includes:

  • AsialoGM1 Antibody, ELISA
  • GD1a Antibody Panel, ELISA
  • GD1b Antibody, ELISA
  • GM1 Antibody, ELISA


Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range By report
Preferred Specimen 4 mL serum
(minimum 1.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83520 x 8
 
6501
Ganglioside Antibody Panel, ELISA (CSF) print

See individual assay for description.

Panel Includes:

  • AsialoGM1 Antibody, ELISA
  • GD1a Antibody Panel, ELISA
  • GD1b Antibody, ELISA
  • GM1 Antibody, ELISA


Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range By report
Preferred Specimen 4 mL CSF
(minimum 2 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83520 x 8
 
8126
Gastroenteritis Viral Antigen Panel, EIA (Stool) print

This unit code has been inactivated.

Please see the following unit codes
40870, 81000 and 81106
 
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21019
GD1a Antibody Panel, ELISA (Serum) print

The presence of antibodies to the ganglioside GD1a has been associated with motor neuropathies. Titers of GD1a antibodies, usually in the high positive range, may also be seen in amyotrophic lateral sclerosis and Guillain-Barré syndrome.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:100
IgM <1:800
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature Room temperature
Results Available 1 to 5 days
CPT Code 83520 x 2
 
61019
GD1a Antibody Panel, ELISA (CSF) print

Detection of ganglioside-specific antibodies in CSF may indicate intrathecal synthesis. Serum levels of ganglioside-specific antibodies, blood-brain barrier integrity, and possible serum contamination of CSF should be considered when assessing CSF results.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:2
IgM <1:2
Preferred Specimen 1 mL CSF
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83520 x 2
 
21002
GD1b Antibody, ELISA (Serum) print

The presence of antibodies to the ganglioside GD1b has been associated with motor or sensorimotor neuropathies. Titers of GD1b antibodies in the low positive range may also be seen in amyotrophic lateral sclerosis and Guillain-Barré syndrome.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:100
IgM <1:800
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature Room temperature
Results Available 1 to 5 days
CPT Code 83520 x 2
 
61102
GD1b Antibody, ELISA (CSF) print

Detection of ganglioside-specific antibodies in CSF may indicate intrathecal synthesis. Serum levels of ganglioside-specific antibodies, blood-brain barrier integrity, and possible serum contamination of CSF should be considered when assessing CSF results.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:2
IgM <1:2
Preferred Specimen 1 mL CSF
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83520 x 2
 
-267
Genetic testing print

Genetic screening and diagnostic testing is performed at Quest Diagnostics Nichols Institute.
For a listing of tests and specimen requirements, visit www.QuestDiagnostics.com.
 
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55122
Giardia Antigen, EIA, Stool print

Giardia Specific Antigen (GSA) is a glycoprotein that is produced in abundant quantities by Giardia lamblia as they multiply within the host intestinal tract. The antigen is present only when Giardia infection is present, and it is possible to find GSA in stool specimens without visible signs of cysts or trophozoites.

This test is approved for New York patient testing.
Methodology EIA (Enzyme Immunoassay)
Reference Range Not Detected
Preferred Specimen Fresh stool: FROZEN
Preserved or Cary Blair: Refrigerated
(minimum 1 gram or 1 mL stool)
Transport Temperature Fresh: 2-8° C
FROZEN: -20 to -70° C

Preserved:15-30° C
Results Available 1 to 4 days
CPT Code 87329
Sample Report(s) Positive
Negative
 
40500
Giardia Antibody, IFA print

A polyvalent conjugate (recognizing IgG, IgM, and IgA) is used to detect the presence of antibodies to Giardia lamblia. A four-fold or greater increase in titer between acute and convalescent sera indicates an acute active phase. A single positive reaction represents previous exposure, since antibody titers are known to remain high for at least six months.

This test is not approved for New York patient testing.
Methodology IFA (Immunofluorescence Assay)
Reference Range <1:16
Preferred Specimen 1 mL serum
(minimum 0.075 mL)
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 86674
 
46056
Giardia lamblia IgA Antibody, IFA print

Recent or current infection by Giardia lamblia is suggested by either detection of specific IgM antibody or a four-fold increase in IgG and/or IgA antibody titers between acute and convalescent sera. Positive IgG and/or IgA titers without detectable IgM suggest past infection.

This test is not approved for New York patient testing.
Methodology IFA (Immunofluorescence Assay)
Reference Range IgA <1:16
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 86674
 
46052
Giardia lamblia IgG Antibody, IFA print

Recent or current infection by Giardia lamblia is suggested by either detection of specific IgM antibody or a four-fold increase in IgG and/or IgA antibody titers between acute and convalescent sera. Positive IgG and/or IgA titers without detectable IgM suggest past infection.

This test is not approved for New York patient testing.
Methodology IFA (Immunofluorescence Assay)
Reference Range IgG <1:16
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 86674
 
46054
Giardia lamblia IgM Antibody, IFA print

Recent or current infection by Giardia lamblia is suggested by either detection of specific IgM antibody or a four-fold increase in IgG and/or IgA antibody titers between acute and convalescent sera. Positive IgG and/or IgA titers without detectable IgM suggest past infection.

This test is not approved for New York patient testing.
Methodology IFA (Immunofluorescence Assay)
Reference Range IgM <1:20
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 86674
 
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20760
Gliadin (deamidated peptide) Antibodies (IgG, IgA) print

See individual assay for description.

Panel includes:

  • Gliadin Peptide IgA ELISA
  • Gliadin Peptide IgG ELISA

This test is approved for New York patient testing.
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range <20 units
Preferred Specimen 2 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83516 x 2
 
20770
Gliadin (deamidated peptide) Antibody (IgA) print

Gliadin-reactive antibodies from patients with celiac disease recognize a limited number of specific gliadin epitopes, and show enhanced binding to gliadin devoid of amide groups. Assays measuring antibodies to deamidated gliadin peptides expressing celiac-specific epitopes are thus more accurate than conventional gliadin antibody assays for diagnosing celiac disease. Gliadin peptide IgA levels decrease in conjunction with adherence to a gluten-free diet.

This test is approved for New York patient testing.



Please see the following technical sheet for more information:
 Serologic Tests for Celiac Disease
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range <20 units
Preferred Specimen 1 mL serum
(minimum 0.25 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83516
 
46050
Giardia lamblia IgG, IgA, IgM Antibody Panel, IFA print

Recent or current infection by Giardia lamblia is suggested by either detection of IgM antibody or a four-fold increase in IgG and/or IgA antibody titers between acute and convalescent sera. Positive IgG and/or IgA titers without detectable IgM suggest past infection.

This test is not approved for New York patient testing.
Methodology IFA (Immunofluorescence Assay)
Reference Range IgG <1:16
IgA <1:16
IgM <1:20
Preferred Specimen 2 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 86674 x 3
 
20660
Gliadin (deamidated peptide) Antibody (IgG) print

Gliadin-reactive antibodies from patients with celiac disease recognize a limited number of specific gliadin epitopes, and show enhanced binding to gliadin devoid of amide groups. Assays measuring antibodies to deamidated gliadin peptides expressing celiac-specific epitopes are thus more accurate than conventional gliadin antibody assays for diagnosing celiac disease.

This test is approved for New York patient testing.



Please see the following technical sheet for more information:
 Serologic Tests for Celiac Disease
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range <20 units
Preferred Specimen 1 mL serum
(minimum 0.25 mL)
Transport Temperature 2-8° C
Results Available 1 to 5 days
CPT Code 83516
 
21540
Glomerular Basement Membrane Antibody (IgG) print

Glomerular basement membrane (GBM) antibodies are identified by reactivity with the non-collagenous portion of type IV collagen. Nearly all patients with Goodpasture's syndrome exhibit GBM antibodies.

Test performed at Quest Diagnostics Nichols Institute.
Methodology EIA (Enzyme Immunoassay)
Reference Range <1.0 AI
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature Room temperature
Results Available 2 to 5 days
CPT Code 83520
 
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25000
Glutamic Acid Decarboxylase-65 Autoantibodies print

Antibodies recognizing the islet cell antigen glutamic acid decarboxylase (GAD) are found in over 80% of insulin-dependent diabetes mellitus (IDDM) patients, and are also present prior to clinical onset. GAD antibody detection is the most sensitive marker for identifying persons at risk for developing IDDM.

Test performed at Quest Diagnostics Nichols Institute.
Methodology Radiobinding Assay
Reference Range <=1.0 U/mL
Preferred Specimen 1 mL serum
(minimum 0.25 mL)
Transport Temperature 2-8° C
Results Available 2 to 8 days
CPT Code 83519
 
21000
GM1 Antibody, ELISA (Serum) print

The presence of antibodies to GM1 (monosialoganglioside-GM1) has been associated with motor or sensorimotor neuropathies, particularly multifocal motor neuropathies. Titers of GM1 antibodies in the low positive range may also be seen in amyotrophic lateral sclerosis (ALS) and Guillain-Barré syndrome. Antibodies to GM1 may occur as either polyclonal or IgM monoclonal antibodies.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:100
IgM <1:800
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature Room temperature
Results Available 1 to 4 days
CPT Code 83520 x 2
 
61001
GM1 Antibody, ELISA (CSF) print

Detection of ganglioside-specific antibodies in CSF may indicate intrathecal synthesis. Serum levels of ganglioside-specific antibodies, blood-brain barrier integrity, and possible serum contamination of CSF should be considered when assessing CSF results.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:2
IgM <1:2
Preferred Specimen 1 mL CSF
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 4 days
CPT Code 83520 x 2
 
21050
GM1 IgG, IgM and IgA Antibody, ELISA (Serum) print

The presence of antibodies to GM1 (monosialoganglioside-GM1) has been associated with motor or sensorimotor neuropathies, in particular multifocal motor neuropathies. Titers of GM1 antibodies in the low positive range may also be seen in amyotrophic lateral sclerosis (ALS) and Guillain-Barré syndrome (GBS). Antibodies to GM1 may occur as either polyclonal or IgM monoclonal antibodies. GM1 IgA antibody is the only GM1 antibody isotype found in approximately 20% of patients with GBS; recovery is slower and less complete in GM1 IgA-positive GBS patients compared to GM1 IgA-negative GBS patients.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:100
IgM <1:800
IgA <1:100
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 4 days
CPT Code 83520 x 3
 
61050
GM1 IgG, IgM and IgA Antibody, ELISA (CSF) print

Detection of ganglioside-specific antibodies in CSF may indicate intrathecal synthesis. Serum levels of ganglioside-specific antibodies, blood-brain barrier integrity, and possible serum contamination of CSF should be considered when assessing CSF results.

This test is not approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range IgG <1:2
IgM <1:2
IgA <1:2
Preferred Specimen 1 mL CSF
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 4 days
CPT Code 83520 x 3
 
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-98
Gonococcal (See Neisseria gonorrhoeae) print

 
27000
GQ1b IgG Antibody, ELISA (Serum) print

IgG antibody to the ganglioside GQ1b is found in over 90% of patients with Miller Fisher Syndrome, characterized by ataxia, areflexia, and ophthalmoplegia (eye muscle paralysis). GQ1b IgG antibody is also found in Guillain-Barré Syndrome (GBS) patients with ophthalmoplegia, but not in patients with classical GBS. Antibody levels typically decrease with clinical course, and are usually undetectable 60-90 days after onset of neurologic symptoms.

This test is approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range <1:100
Preferred Specimen 1 mL serum
(minimum 0.5 mL)
Transport Temperature Room temperature
Results Available 1 to 4 days
CPT Code 83520
 
67000
GQ1b IgG Antibody, ELISA (CSF) print

Detection of ganglioside-specific antibodies in CSF may indicate intrathecal synthesis. Serum levels of ganglioside-specific antibodies, blood-brain barrier integrity, and possible serum contamination of CSF should be considered when assessing CSF results.

This test is approved for New York patient testing.



Please see the following technical sheet for more information:
 Neuropathy-associated Antibody Testing
Methodology ELISA (Enzyme Linked Immunosorbent Assay)
Reference Range <1:2
Preferred Specimen 1 mL CSF
(minimum 0.5 mL)
Transport Temperature 2-8° C
Results Available 1 to 4 days
CPT Code 83520
 
51125
Gram Stain, LM print

This preeminent differential stain is used to demonstrate the morphology and staining properties of bacteria and fungi that are directly detected in clinical specimens.

This test is approved for New York patient testing.
Methodology Light Microscopy
Reference Range No organisms seen
Preferred Specimen Clinical specimen properly collected. Refer to Microbiology or Mycology Specimen Collection and Transport Guide.
Transport Temperature 2-8° C
Results Available 1 to 3 days
CPT Code 87205
 
-99
Group B Streptococcus (See Streptococcus, Group B)
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First FDA Clearance of a 2009 H1N1 Test Given to Focus Diagnostics


FDA Issues Another Emergency Use Authorization for Commercial H1N1 Flu Test to Quest Diagnostics’ Focus Diagnostics


Focus Diagnostics provides the first commercial test for detecting the 2009 H1N1 influenza virus that the FDA has authorized for emergency use.


Focus Diagnostics receives NYSDOH exemption for Diagnostic Immunology and Serology testing services


Focus Diagnostics Launches Laboratory Test for Chikungunya Virus


 
   
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