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.
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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 |