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HelpTest Code DHPR DIHYDROPTERIDINE REDUCTASE (DHPR), BLOOD
Performing Laboratory
St. Louis Children's Hospital Sendout to Children's Hospital Los Angeles
Specimen Requirements
Patient Preparation: None
Container/Tube
Acceptable: Newborn screen filter paper. Call core lab at 314-454-4268 to obtain filter paper.
Collection Volume: Collect 4 blood spots from a heelstick onto filter paper. Each spot should be about the size of a penny and filter paper needs to be completely saturated at each spot.
Special Instructions:
1. Allow filter paper to dry for 2 hours at ambient temperature only then forward to lab.
2. Send competed "Children's Hospital Los Angeles Biochemical Genetics & Special Chemistry Test Requisition" with specimen.
Sample Rejection
Insufficient blood in circles on NBS card
Mislabeled or unlabeled specimens.
Logistics
Test Availability: Daily
Cut-off time: None
Days set up by performing lab: Monday-Friday
Turnaround Time: 7-10 days
Reference Values
Reference Interval: Interpretive report will be provided
Critical Value: Decided by Medical director at performing laboratory based on abnormal pattern
Methodology
Spectrophotometric
Limitations
NA
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: Keep saturated newborn screen filter paper at room temperature.
Processed Volume: 3-5 circles on NBS card
Transport Temperature: Ambient
Analyte Stability: NA
NOTE:
1. Filter paper to be used for specimen collection is located in the 'special tube" drawer in send-out area.
2. Send competed "Children's Hospital Los Angeles" requisition with specimen.
3. Ship specimen to:
Department of Pathology and Laboratory Medicine
Duque Building, 2nd Floor, Room 2-290
Children's Hospital Los Angeles
4650 Sunset Blvd.
Los Angeles, CA 90027
Test Classification and CPT Code
EPIC order name: Miscellaneous Lab Test
Cerner order name: Misc Ref SLC
82657
LOINC
NA
Last Reviewed
08/2025