Phenylalanine/Tyrosine [Molar ratio] in DBS --post therapeutic diet   74300-5

LOINC Code


LOINC code74300-5
namePhenylalanine/Tyrosine [Molar ratio] in DBS --post therapeutic diet
descriptionThis 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.
statusACTIVE

Fully-Specified Name

componentPhenylalanine/Tyrosine^post therapeutic diet
propertySRto  =  Substance Ratio
timePt  =  Point in time:  To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
systemBld.dot  =  Blood filter paper
scaleQn  =  Quantitative:  The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256
method

Additional Names

short namePhe/Tyr p diet DBS-sRto

Basic Attributes

classCHAL
type1  Laboratory
order vs. observationBoth
example UCUM units{ratio}
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org)
example unitratio

Associated Observations

LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term may represent a single associated observation or panel containing several associated observations.

Member of these Panels

74874-9Metabolic disorder therapy monitoring panel - DBS

History/Usage

first released
last updated2.61
last change typeMIN  - change to field other than name

Related Names

After
Blood
CHEMISTRY.CHALLENGE TESTING
DBS
Dried blood spot
Filter paper
FP
p diet
Phe
Phe+Tyr
Phenylalanine +Tyrosine
PKU
Point in time
PPA
PST
QNT
Quan
Quant
Quantitative
Random
Scrto
Substance concentration ratio
Substance ratio
Ther
Tyr
WB
Whole blood

Copyright © 2024 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2024, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.

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