55137-4

LOINC Code


LOINC code55137-4
name
descriptionSusceptibility of an isolate to parenteral penicillin in the context of a patient with meningitis, i.e., the "meningitis breakpoint". Various agencies, including the FDA and CLSI in the U.S. and EUCAST in Europe, publish guidelines for determining susceptibility of different organisms to different antimicrobials. In most cases, susceptibility does not vary by type of infection, but for a few specific types of infection, including meningitis, pneumonia and urinary tract infection, certain antimicrobials have different susceptibility thresholds.
statusACTIVE

Fully-Specified Name

componentPenicillin
propertySusc  =  Susceptibility
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.
systemIsolate.meningitis  =  Isolate from patient with meningitis
scaleOrdQn  =  Quantitative or Ordinal:  Test can be reported as either Ord or Qn, e.g., an antimicrobial susceptibility that can be reported as resistant, intermediate, susceptible or as the mm diameter of the inhibition zone. We discourage the use of OrdQn in other circumstances.
methodMIC.parenteral

Additional Names

short nameANTIBIOTIC SUSCEPTIBILITIES; AST; ID; Infectious Disease; InfectiousDisease; Islt; Islt.mening; Isol; Mening; Minimum inhibitory concentration; PCN; Pen; Penicilloyl; Point in time; Random; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; Wy

Basic Attributes

classABXBACT
type1  Laboratory
order vs. observationPenicillin Islt

Member of these Panels

50545-3

History/Usage

first released
last updated2.83
last change typeNAM  - change to Analyte/Component

Related Names

N

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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