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Test Code Billings Clinic: 7679 Phenylketonuria (PKU) Newborn Screening Panel

Performing Laboratory

Montana Public Health Laboratory, Helena, Montana

Specimen Requirements

Obtain specimen using a Newborn Screening Specimen Card (minimum volume:  5 completely filled circles) as follows:

  1. Sterilize, allow skin to dry, and puncture heel with sterile lancet.
  2. Allow large blood droplet to form.
  3. Touch filter paper to blood and allow to soak through completely in each circle. Total saturation of circles must be evident when paper is viewed on both sides. Do not apply blood to both sides.
  4. Use of capillary tubes is not recommended because they tend to roughen filter paper and cause over absorption.
  5. Allow blood spots to air dry thoroughly for 2 to 3 hours at ambient temperature.
  6. Keep away from direct sunlight and heat.
  7. Do not stack filter papers before they are thoroughly dried. A protective cover may be used to hold specimen while drying.
  8. Cover with end flap only after specimen is completely dry.
  9. Maintain sterility and forward promptly.

Reference Values

Reference values are included with patient’s report.

Test Classification and CPT Coding

82017 - acylcarnitine profile

82136 - aminoacidopathies

82261 - biotinidase

82775 - galactose

83020 - hemoglobinopathy

83498 - CAH

83516 - cystic fibrosis

84030 - phenylalanine

84437 - thyroxine, T4

84443 - thyroid-stimulating hormone (TSH) (if appropriate)

Profile/Testing Information

Includes aminoacidopathies*, galactose, biotinidase*, hemoglobinopathy, congenital adrenal hyperplasia (CAH)*, organic acidemia disorders*, cystic fibrosis, phenylketonuria (PKU), fatty acid oxidation disorders*, and thyroxine (T4).

 

Reflex Information:

If T4 is <10 µg/dL; Billings Clinic: #4056 “Thyroid-Stimulating Hormone (TSH), Plasma” reflex testing will be performed at an additional charge.

 

General Information:
*Tests are referred to the Wisconsin Newborn Screening Laboratory in Madison, WI for testing.