Phenylalanine and Tyrosine

Centralized Core Laboratory:Chemistry

Test ID/Workstation: PATY NWCH

Specimen Type: Blood

Tube Type: Blood Spot Card only

Collection Volume: Filter paper must be saturated

Cause for rejection: Blood Spot card where filter paper is not saturated with blood.


Storage: Ambient

Availability: Sent to Reference Laboratory

Special Instructions: Do not allow capillary tube or patient heel to touch the collection card. Allow sample to air dry for 3 hours before sending to laboratory. Filter paper on Blood Spot card must be saturated with blood.

For Outpatients, test should only be drawn in outpatient locations within a Hospital (Akron or Beeghly).

Lab/Phone: 330-543-8418

TAT: 1-3 days

Additional Info: Reference range:

Phenylalanine: 0.7-3.0 mg/dL


0-30 days: 42-99 umolL

1month-15years: 29-86 umol/L

>16years: 21-87 umol/L

CPT Code: 8403084510

Requisition Form
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