Gamma interferon negative control spot count [#] in Blood   74279-1

LOINC Code


LOINC code74279-1
nameGamma interferon negative control spot count [#] in Blood
descriptionThe count of negative control spots (0 to >20) in a patient's T cells incubated without M. tuberculosis antigens (ESAT-6, CFP10). This term is created for, but not limited in use to, Oxford Immunotec's T-SPOT.TB assay, used to diagnose M. tuberculosis. T-SPOT.TB assay uses enzyme-linked immunospot (ELISPOT) methodology to enumerate M. tuberculosis-sensitized T cells by capturing interferon-gamma (IFN-y) in the vicinity of T cells in the patient's whole blood. In the T-SPOT.TB test, a typical result is expected to have few to no spots in the negative (nil) control and 20 or more spots in the positive control (Mitogen stimulated). A negative control spot count of >10 is considered invalid.
statusACTIVE

Fully-Specified Name

componentGamma interferon.negative control spot count
propertyNum  =  Number
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  =  Whole blood
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 nameIGNF neg cntrl Bld

Basic Attributes

classMICRO
type1  Laboratory
order vs. observationBoth
example UCUM units{#}
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 unit#

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

74281-7Mycobacterium tuberculosis stimulated gamma interferon and spot count panel - Blood

History/Usage

first released
last updated2.46
last change typeMIN  - change to field other than name

Related Names

Blood
Cnt
Count
ID
IFN
IGNF neg cntrl
IGNF neg control
Infectious Disease
InfectiousDisease
Lung
Microbiology
NEG
Number
Point in time
Pulmonary
Pulmonology
QNT
Quan
Quant
Quantitative
Random
Respiratory
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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