Random urine. PROTECT FROM LIGHT

2 mL urine (no preservative) refrigerated (Min: 1 mL).

* Collection Instructions *

• Urine should be refrigerated and protected from light.
• Whenever possible, the specimen should be collected during an acute episode because porphobilinogen (PBG) may decrease rapidly upon remission.
• PBG may also degrade when samples are exposed to UV light for extended periods, or are transported at ambient temperature.
• If an amber collection jug/urine cup is not available, the sample must be protected from light by completely wrapping the container in aluminum foil.
• PBG is most stable at pH 6-7, but all samples may be sent with or without preservative.
• All results should be interpreted in the context of clinical findings, relevant history, and other laboratory data.

Ambient: Unacceptable

Refrigerated: 7 days

Frozen: 30 days

Not protected from light