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HelpTest Code LAB3372 Phenylbutyrate Metabolite Analysis
Clinical System Name
Phenylbutyrate Metabolite Analysis
Description
This assay measures the levels of phenylacetylglutamine (PAG) and its upstream metabolites phenylbutyrate and phenylacetate in plasma.
Sample Requirements
Specimen: Whole Blood
Container(s): Dark Green/Sodium Heparin
Preferred Vol: 4.0 mL
Minimum Vol: 2.0 mL
Note:
Processing Instructions
Reject due to:
Spin: Y
Aliquot: Y
Temp: -20 C
Storage Location: CPA -20 freezer, Send Outs rack.
Off-site collection: Spin and aliquot specimen as soon as possible. Send 1-2 mL of plasma 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.
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: (800) 411-4363
Department
Department: Send Outs
Phone Number: (206) 987-2563
Synonyms
Ravicti metabolites
Availability
| STAT | Performed | TAT |
| 10 d |
Methodology
Method: LC-MS/MS
Analytical Volume: 1.0 mL Plasma
Limitations:
CPT Codes
82542, 83789
Send Out Instructions
| Reference Test Name | Phenylbutyrate Metabolite Analysis |
| Reference Lab Test Code | 4650 |
| Instructions | Send frozen overnight to Baylor via FedEx. Will accept Saturday deliveries. |