- Urine - Plain White Top Universal
- Protect from light
- Preferably early morning sample
- Dilute urine unsuitable
North Devon District Hospital (24/7)
Urine Total Porphyrins: 20 – 320 nmol/L
Urine Porphyrin:Creatinine Ratio: 0 - 34 nmol/mmol
Samples will be sent to an External laboratory for confirmation if not on a patient with a confirmed diagnosis of porphyria.