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HelpTest Code LAB1961 Phenylbutyrate, Urine
Clinical System Name
Phenylbutyrate, 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 |
Availability
| STAT | Performed | TAT |
| 10 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
CPT Codes
82542 (x3), 83789, 82570
Methodology
Method: LC-MS/MS
Analytical Volume: 2.0 mL Urine
Limitations:
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. |
Description
This assay measures the levels of phenylacetylglutamine (PAG) and its upstream metabolites phenylbutyrate and phenylacetate in urine.