Uroporphyrin-1-Synthetase

Source	Blood
Mnemonic	U1S
Specimen Requirements	2 x 5 mL dark green top heparin tube, NOT PST Whole blood Protect from light by wrapping tubes in foil.
Specimen Handling	Transport whole blood on ice to DSC Referrals. DO NOT freeze; wrap the specimen to avoid direct contact with ice pack.
Additional Information	Provide hematocrit result.
Testing Location	Hospitals in Common
Testing Frequency
Alternate Name(s)	Porphobilinogen deaminase
Reference Interval

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