Asparaginase Frequently Asked Questions

The L-asparaginase assays are laboratory developed tests (LDT) to determine the enzyme activity of L-asparaginase or the presence of anti-asparaginase antibodies in patients who have been treated with Oncaspar® or Erwinaze®. These assays have been validated and are performed in a CLIA certified high complexity laboratory.

L-asparaginase activity test determines the concentration of drug which can help physicians identify patients experiencing “silent inactivation” as well as to ensure that adequate asparaginase activity is present during asparaginase treatment. The assay is performed using a serum sample obtained from the patient after treatment.

The ELISA antibody assay determines the presence or absence of antibodies to Asparaginase. This test allows clinicians to monitor their patient’s antibody levels in a manner similar to therapeutic drug monitoring as done with the asparaginase activity assay. This assay reports the presence or absence of antibodies to asparaginase in the sample, but it does not distinguish between general antibodies towards asparaginase and neutralizing antibodies.

  • The Asparaginase Activity Assay is $495
  • The Asparaginase Panel is $495 (includes both activity and antibody results)
  • The Asparaginase Activity Assay CPT Code is 82657x2
  • The Asparaginase Panel CPT Codes are 82657x2 and 83516

No, we do not bill insurance. We only bill the institution sending in the sample. We do not require that an institution be set up prior to receiving a sample.

Right from our website using the links below.

Sample Submission Form      Supply Order Form      Laboratory Manual

No. You can use supplies you already have on hand, it just needs to be collected in a red-top tube or gel-barrier tube, to separate serum from red blood cells. Please only submit the serum. Each sample needs a minimum of 0.5 mL to perform both assays.

Yes, we are, and we are also Joint Commission accredited. View certificates by clicking the images below or by visiting our Compliance page.


98% of our samples are reported out within five hours of receipt. All samples are reported out the same day or within one day of receipt.

Frozen or refrigerated specimens must be transported in insulated containers surrounded by an ample amount of dry ice (frozen) or frozen cold packs (refrigerated) to keep the specimen at optimal storage condition until arrival to the laboratory. Specimens received internationally must be shipped using dry ice. It is also recommended that samples shipped during the summer months be shipped frozen on dry ice due to the potential exposure to high temperatures during shipment.

Specimen:  Serum
Collection:  Venous Collection, red‐top tube or gel‐barrier tube, separate serum from RBCs within two hours, freeze/refrigerate serum immediately
Volume:  0.5 – 2 mL
Storage Instructions:  Freeze prior to transport. Sample may be refrigerated at 2°C to 8°C

All samples and requisitions MUST be labeled with the following information.
  1. The Patient's first and last name or a unique ID code is required
  2. The second patient identifier may be one of the following:
    • Date of birth.
    • Other unique patient identifier, e.g. medical record number, social security number.
    • Barcode labels can be used if barcode matches the unique identifiers on the printed requisition, including our provided barcode or requisition # where applicable.
    • Time and date of collection

Granger Genetics was the company which first validated the asparaginase activity assay in conjunction with the pharmaceutical companies which owned the two drugs tested in the assay.

  • In 2016, Granger Genetics performed a major revalidation of the original assay (which is the assay performed by our competitors).
  • The science of the assay is the same as our competitor’s assay, but we streamlined the process and introduced some automation techniques which make the assay more robust and therefore reduced human error.
  • We also moved our data processing away from an excel spreadsheet to a validated data processing software which reduced the need for human interpretation of the results allowing for another reduction in human error.
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