Collect 24-hour urine specimen in a glass or plastic bottle containing 10 mL concentrated hydrochloric acid. Record the volume in liters.
Ascorbic acid at very high concentration (exceeding 16 mcmol/mL urine) can interfere. It is recommended that patients refrain from taking excessive amounts of vitamin C or vitamin C rich food for at least 48 hours prior to collection.
Plastic container (preservative-free)
Gray top tube (Sodium Fluoride / Potassium Oxalate).
Rejection criteria pertain to clinical sample submissions only.
Room Temperature: 14 day(s)
Refrigerated: 14 day(s)
Frozen (-20 °C): 30 day(s)