20653-2

LOINC Code


LOINC code20653-2
name
descriptionGenetic metabolic specialist (from Canada) point out that plasma may be the traditional sample of choice, but they see no clinically significant difference between plasma and serum amino acids.
statusDEPRECATED
Replacements

alternatives to this code:

14875-9

Fully-Specified Name

componentPhenylalanine
propertySCnc  =  Substance Concentration
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.
systemSer/Plas
    Ser  =  Serum
    Plas  =  Plasma
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 nameChemistry; Level; Phe; Pl; Plasma; Plsm; Point in time; PPA; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Substance concentration

Basic Attributes

classCHEM
type1  Laboratory
order vs. observationDeprecated Phe
example UCUM unitsumol/L
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)

Member of these Groups

LG49954-7Phenylalanine|Pt|Ser/Plas|165.19 g/mole
LG2665-0Phenylalanine|SCnc|Pt|ANYBldSerPl

History/Usage

first released
last updated2.7
last change typeMIN  - change to field other than name
change reasonumol/L

Related Names



Copyright © 2026 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2026, 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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