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HelpPhenylalanine Level
Collection Requirements
Source: Dried blood spot on filter paper
(S&S type 903 or equivalent) obtained from Toxicology
Home Collection:
- Completely fill at least 2 circles
- Blood spots should be completely dry before they are shipped (4 – 6 hours)
Source: blood
Container:
- Preferred : Lithium heparin mint green gel
- Acceptable: Red gel
Volume: 1 mL in a vacutainer or 600 uL in microtainer
Turn Around Time
1-5 days
Testing performed on Tuesday and Thursday
Must be received in the Toxicology Lab by 7:00 a.m. Tuesday or Thursday to be included in the batch
Availability
Routine
Lab Processing Instructions
Specimen: Dried blood spot on filter paper
Room temperature
Specimen: plasma or serum
Spin, separate, and refrigerate
Performing Laboratory
Adele Hall
Adele Hall Lab Section
Biochemical Genetics
Instrumentation/Methodology
High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)
Additional Information
Phenylalanine measurement is used in the diagnosis of hyperphenylalanine and PKU
Reference Ranges
| Age | Reference Range (mg/dL) | Reference Range (umol/L) |
|---|---|---|
| Premature infant | 1.6 - 3.5 | 98 - 213 |
| 0-1 month | 0.6 - 2.3 | 38 - 137 |
| 1 month - 2 years | 0.5 - 1.2 | 31 - 75 |
| 2-18 years | 0.4 - 1.5 | 26 - 91 |
| >18 years | 0.6 - 1.4 | 35 - 85 |
CPT
84030