Updated Test
Effective Date
03/29/2022
Included in Report
Updated Test
Updated Test
Specimen Information
Patient Preparation
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Patient should be fasting for at least 12 hours prior to collection. Patient should avoid taking vitamin C supplements for 24 hours prior to collection. |
Collect
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Green sodium heparin |
Specimen Preparation
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: After drawing specimen, immediately place green sodium heparin tube on wet ice. Centrifuge for 10 minutes 3500 rpm within 1 hour of collection. Use of a 4 degree °C refrigerated centrifuge is optimal but not required. Aliquot 5.0 mL plasma in screw capped plastic vial. Adjust the pH of the plasma specimen to a pH of 2.3-2.7 with approximately 10 mcL concentrated (12M) hydrochloric acid (or 20 mcL of 6M HCl) per 1 mL plasma. CRITICAL FROZEN. |
Alternate Specimen
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Nonacidified specimens can be accepted if the heparinized plasma is properly frozen. A disclaimer will be added in nonacidified plasma, "Sample was received nonacidified and frozen. In nonacidified samples oxalate values may increase spontaneously." Although there can be a small absolute increase of plasma oxalate in nonacidified specimens, this will not change the clinical interpretation. |
Minimum Volume
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: 2.0 mL |
Transport Temperature
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Critical Frozen |
Rejection Criteria
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Sample collected in anything other than a green sodium heparin. |
Stability
| Previous: | Updated To: |
|---|---|
| Added: Room Temperature: Unacceptable | |
| Added: Refrigerated: Unacceptable | |
| Deleted: | Added: Frozen: 30 days |
Methodology
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Enzymatic |
Reference Range
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: ≤ 2.0 mcmol/L |
| Added: Reference values have not been established for patients younger than 18 years of age or older | |
| Added: than 87 years of age. |
Performing Laboratory
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: MAYO |
Days Performed
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: Monday - Friday |
Turn-around Time
| Previous: | Updated To: |
|---|---|
| Deleted: | Added: 5 - 9 days |