74300-5
LaboratoryPhenylalanine/Tyrosine [Molar ratio] in DBS --post therapeutic diet
Definition
This test measures the phenylalanine to tyrosine ratio in children who have been diagnosed with phenylketonuria and are on a therapeutic diet for their condition. The parent of the patient collects the dried blood spot specimen at home and sends it to the laboratory. This ratio is used together with the phenylalanine and tyrosine levels to monitor the patient's progress. Note: different locations use different monitoring analytes. In some states, tyrosine and phenylalanine levels are used in conjunction with the succinylacetone level instead of the phenylalanine to tyrosine ratio.
LOINC 6-Axis Classification
Component
Phenylalanine/Tyrosine^post therapeutic diet
Property
SRto
Time Aspect
Pt
System
Bld.dot
Scale Type
Qn
Method Type
N/A
Details
Class
CHAL
Order/Observation
Both
Short Name
Phe/Tyr p diet DBS-sRto
Display Name
Phenylalanine/Tyrosine post therapeutic diet (DBS) [Molar ratio]
Related Names
Frequently Asked Questions
What is LOINC code 74300-5?
LOINC code 74300-5 identifies "Phenylalanine/Tyrosine [Molar ratio] in DBS --post therapeutic diet". This test measures the phenylalanine to tyrosine ratio in children who have been diagnosed with phenylketonuria and are on a therapeutic diet for their condition. The parent of the patient collects the dried blood spot specimen at home and sends it to the laboratory. This ratio is used together with the phenylalanine and tyrosine levels to monitor the patient's progress. Note: different locations use different monitoring analytes. In some states, tyrosine and phenylalanine levels are used in conjunction with the succinylacetone level instead of the phenylalanine to tyrosine ratio.
What does 74300-5 measure?
This code measures Phenylalanine/Tyrosine^post therapeutic diet in Bld.dot. It belongs to the CHAL class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.