Click here to view our updated timings.
Click here to view our updated timings.
Click here to view our updated timings.
Oxalic Acid
10 days
Enzymatic
State patient's age, sex, and total 24-hour urine volume on the test request form and specimen. Specimens submitted without preservative should be acidified after receipt to pH ≤3 with 6N HCl prior to aliquoting. Causes for Rejection
Urine sample received with a pH not ≤3 from a patient on high doses of vitamin C.
Accredited Laboratory Partner
Contact Technical Support
Quantifies oxalate in a 24-hour collection. Helps assess kidney stone risk.
24 hour urine
10 mL aliquot
24 hour urine container with 30 mL 6N HCl preservative
Avoid vitamin C supplements and vitamin C-rich foods (eg, citrus fruits like oranges, orange juice; vegetables like broccoli, tomatoes, peppers, potatoes) for 48 hours prior to collection.
Instruct patient to void at 8 a.m. (or 8 p.m.) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (i.e., 8 a.m. [or 8 p.m.] the following day). Label container with patient's name and date and time collection started and finished. Measure and record total urine volume. Mix well. pH must be ≤3. Preservative not necessary during collection but should be added to urine collection within 24 hours.
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 8 weeks |
Oxalic Acid
10 days
Enzymatic
State patient's age, sex, and total 24-hour urine volume on the test request form and specimen. Specimens submitted without preservative should be acidified after receipt to pH ≤3 with 6N HCl prior to aliquoting. Causes for Rejection
Urine sample received with a pH not ≤3 from a patient on high doses of vitamin C.
Accredited Laboratory Partner
Contact Technical Support
Quantifies oxalate in a 24-hour collection. Helps assess kidney stone risk.
24 hour urine
10 mL aliquot
24 hour urine container with 30 mL 6N HCl preservative
Avoid vitamin C supplements and vitamin C-rich foods (eg, citrus fruits like oranges, orange juice; vegetables like broccoli, tomatoes, peppers, potatoes) for 48 hours prior to collection.
Instruct patient to void at 8 a.m. (or 8 p.m.) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (i.e., 8 a.m. [or 8 p.m.] the following day). Label container with patient's name and date and time collection started and finished. Measure and record total urine volume. Mix well. pH must be ≤3. Preservative not necessary during collection but should be added to urine collection within 24 hours.
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 8 weeks |