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HelpTest Code LAB1961 Phenylbutyrate, Urine
Clinical System Name
Phenylbutyrate, Urine
Description
This assay measures the levels of phenylacetylglutamine (PAG) and its upstream metabolites phenylbutyrate and phenylacetate in urine.
Sample Requirements
Specimen: Urine
Container(s): Sterile Container
Preferred Vol: 4.0 mL
Minimum Vol: 2.0 mL
Note:
Processing Instructions
Reject due to:
Spin: N
Aliquot: Y
Temp: -20 C
Storage Location: CPA -20 freezer, Send Outs rack.
Off-site collection: Aliquot specimen as soon as possible. Send 1-2 mL of urine on dry ice to Seattle Children's Main Lab. It is preferable that the sample is received by Seattle Children's Main Lab within 5 days from the date of collection.
Note: Do not add preservatives.
Stability
| Specimen Type | Temperature | Time |
| Room temp | 2 h | |
| Refrigerated | Unacceptable | |
| Frozen | 7 d |
Performing Laboratory
Baylor Miraca Genetics Laboratories
Biochemical Genetics Laboratory
2450 Holcombe, Grand Blvd. - Receiving Dock
Houston, TX 77021-2024
Phone Number: (713) 798-6555
Department
Department: Send Outs
Phone Number: (206) 987-2563
Availability
| STAT | Performed | TAT |
| 10 d |
Methodology
Method: LC-MS/MS
Analytical Volume: 2.0 mL Urine
Limitations:
CPT Codes
82542 (x3), 83789, 82570
Send Out Instructions
| Reference Test Name | Phenylbutyrate Metabolite Analysis (Urine) |
| Reference Lab Test Code | 4651 |
| Instructions | Send frozen to Baylor via FedEx Priority Overnight. Saturday deliveries are accepted. |