Test Overview
Test Methodology

Spectrophotometric; HPLC, fluorescent detection

Reference Range *

Interpretive report provided

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Friday
Analytic Time

7 days

Soft Order Code
Reference Laboratory
Children's Hospital Los Angeles
Special Testing
Specimen Requirements
Collection Instructions

Collect both specimens, blood spot card and urine. The urine must be protected from light by wrapping the entire cup in foil or a paper towel. (Be sure to cover the bottom). Send blood spot card to Specimen Processing ambient, the urine must be frozen

Special Handling

Bloodspot card is to be kept ambient or refrigerated, urine must be frozen

Alternate Specimen
Blood may be collected in a green top (sodium heparin) tube
Normal Volume
5 spots on card, and 10 mL urine
Minimum Volume
3 spots on card, and 5 mL urine
Storage Temperature
Blood spot card (or green top tube) to be kept ambient or refrigerated; Urine must be frozen PFL
Rejection Criteria
Bloodspot card was frozen, or urine was not PFL
Additional Information

Test performed by Children's Hospital Los Angeles Biochemical Genetics/ Special Chemistry Lab

CPT Code
82657, 82542