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Test Code LAB3034 CU Index

Additional Codes

FCUIX


Specimen Required


Patient Preparation: Patients taking calcineurin inhibitors should stop medication 72 hours prior to draw. Patients taking prednisone should be off their medication for 2 weeks prior to draw.

Specimen Type: Serum

Collection Container/Tube: Red or SST

Submission Container/Tube: Plastic vial

Specimen Volume: 2 mL

Collection Instructions:

1. Draw 5 mL blood in a serum separator tube (SST) (plain, red-top tube is acceptable).

2. Separate from cells within 2 hours of draw. Send 2 mL of serum ambient in a plastic vial.


Secondary ID

57549

Method Name

Ex Vivo Challenge, Cell Culture and Histamine Analysis

Specimen Type

Serum

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Ambient (preferred) 14 days
  Frozen  14 days
  Refrigerated  14 days

Reject Due To

Hemolysis: NA
Thawing: Warm OK; Cold OK
Lipemia: NA
Icterus: NA
Other: NA

Reference Values

< 10.0

 

The CU Index test is the second generation Functional Anti-FceR test. Patient with a CU Index greater than or equal to 10 have basophil reactive factors in their serum which supports an autoimmune basis for disease.

 

Method Description

Ex-Vivo Challenge and cell culture: Donor blood cells are incubated with patient serum, a negative control and a positive control. Following the ex-vivo challenge, the cells are centrifuged and the supernatant is recovered for assay of histamine released. Histamine Analysis: Using a quantitative enzyme immunoassay, the histamine released into the supernatant is measured and compared to the total histamine in the basophils.

Day(s) Performed

Monday and Thursday

Report Available

2 to 9 days

Performing Laboratory

Eurofins Viracor

CPT Code Information

86343

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FCUIX CU Index 63369-3

 

Result ID Test Result Name Result LOINC Value
FCUIX CU Index 63369-3