Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB3055             Geisinger Epic ID: 7221

Specimen type:
Whole blood
Preferred collection container:
Alternate Collection Container:
Other volume lavender-top (K2 EDTA) tubes, including microcollection tube
Specimen required:
EDTA lavender-top tube: 500 uL is the minimum acceptable volume.
Special notes:
Do not perform on patients <6 months of age.

Specimen processing instructions:
Do not centrifuge or freeze. 
Transport temperature:
Specimen stability:
Refrigerated: 96 hours.
Rejection criteria:
Frozen, clotted, hemolyzed, underfilled, centrifuged, beyond stability limits or plasma-only sample.

Reference interval:
Additional information:
Test is unreliable in infants under 6 months of age.

Interfering Substances: 
  1. Elevated levels of Hgb F can cause false negative results.
  2. Recent transfusions can cause false positive and false negative results.
  3. Some rare hemoglobin variants such as Hgb C Harlem or C Georgetown may give a false positive reaction.
  4. All positive or questionable results should be further evaluated with hemoglobin electrophoresis.

Turnaround Times:

Routine 4 Hours
STAT 1 Hour
Extended TAT 3 Days
Timed 60 Minutes
Pending Discharge 45 Minutes
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Hemoglobin S Screen, Sickling, Hgb S Screen
Hgb S Screen, SCS
Sickledex Test, Sickledex Screen
Sickle cell screening test
Sickle Solubility Test, Solubility Screening Test for Hemoglobin S
Clinical significance:
Used to screen for sickle cell trait or disease. A positive test should be confirmed with hemoglobin electrophoresis evaluation to confirm and determine the type of disease.
Doctoral Director(s:)
Mary Dhesi MD    
Review Date: 04/04/2023

Performing Locations

Geisinger Medical Center

Performing laboratory: Hematology
Technical Lead: Margaret Knowles-Tuchman
Frequency: Daily, 1st shift, once per day.
Performed STAT? No
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