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Test Code LAAPS4 LA/APS Antigenic Level 1 Only (Intended for follow-up limited to antigenic abnormalities)

Specimen and Container/Tube

Specimen Type: Serum

Preferred Specimen: Red Top Tube

Other Acceptable specimens: N/A

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

Collect specimen per standard collection procedure and send to laboratory immediately. 

 

NOTE: Once each blue top tube is completely filled, gently invert the sample tube at least five times to ensure complete mixing of the contents.

 

UCMC Offsite and UC MedLab Outreach Instructions: 

 

  • Collect specimen per standard collection procedure.
  • Once each red top tube is completely filled, gently invert the sample tube at least five times to ensure complete mixing of the contents.
  • Specimen should be centrifuged at >2500 x g for 10 minutes.
  • Aliquot removed serum into 3 tubes containing minimum of 0.5 mL of specimen each.
  • Serum samples must then be frozen at -20oC.
  • Once solidly frozen, they must be shipped on dry ice. Samples that have thawed in transit will be rejected.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are clotted or grossly hemolyzed.

Reference Values

 

Test

Age

Sex

Reference Range

Anti-cardiolipin IgG

All

All

<20.1 CU

Anti-cardiolipin IgM

All

All

<20.1 CU

Anti-beta-2 GPI IgG 

All

All

<20.1 CU

Anti-beta-2 GPI IgM

All

All

<20.1 CU

Critical Values

Analyte

Unit

Low

High

Age

N/A

N/A

N/A

N/A

N/A

CPT Codes

86147 X2, 86146 X2, 85390

LOINC Codes

3181-5, 3182-3, 16135-6, 16136-4

Volume

Preferred Volume: 2.0 mL serum

 

Minimum Volume: 1.0 mL serum

Specimen Stability

Storage Temperature

Stability

Room temperature

8 hours

Refrigerated

72 hours

Frozen

30 days

Collection Instructions

Collect specimen per standard laboratory collection procedures. 

 

NOTE: Once each blue top tube is completely filled, gently invert the sample tube at least five times to ensure complete mixing of the contents.

Test Components

  • Anti-cardiolipin IgG
  • Anti-cardiolipin IgM
  • Anti-beta-2 GPI IgG
  • Anti-beta-2 GPI IgM
  • Pathology interpretation

Clinical Indications

The package includes antigenic testing for detection of antiphospholipid antibodies. Designed for follow up testing for patients with antiphospholipid antibodies without LA.

Methodology

Chemiluminescence

Additional Information

The package includes testing for the presence of IgG and IgM antibodies directed against beta-2 glycoprotein I (beta-2 GPI). Because the conformational presentation of beta-2 GPI determines whether or not a particular patient antibody will recognize it as an antigenic target, the beta-2 GPI is employed in two different forms. The first employs the beta-2 GPI directly attached to solid phase, and is termed the IgG or IgM anti- beta-2 GPI assay. The second employs cardiolipin directly attached to the solid phase, with beta-2 GPI then secondarily being bound to the cardiolipin, and is termed the IgG or IgM anti-cardiolipin assay.

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

STAT Turnaround Time: N/A

 

Routine Turnaround Time: 4 days

 

Testing Schedule: Three times a week, Monday to Friday.

Synonyms/Keyword Search

Lupus; LA; APS; LA/APS; APS/LA;
Anticardiolipin Antibodies; Beta-2 Glycoprotein I Antibodies;
LAAPS4

Last Review Date

04/26/2024

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