Terminology
This
page
is
part
of
the
Continuous
Integration
Build
of
FHIR
Specification
(v4.0.1:
R4
-
Mixed
Normative
and
STU
)
in
it's
permanent
home
(it
will
always
(will
be
available
incorrect/inconsistent
at
this
URL).
The
current
version
which
supercedes
this
version
is
5.0.0
.
For
a
full
list
of
available
versions,
see
times).
See
the
Directory
of
published
versions
.
Page
versions:
R5
R4B
R4
R3
|
Work
Group
|
Informative |
Use
Context
:
|
Official
URL
:
http://hl7.org/fhir/observation-statistics
|
|
|||
| active as of 2022-11-30 |
|
|||
|
|
OID : 2.16.840.1.113883.4.642.1.1126 | |||
This Code system is used in the following FHIR core-defined or referenced value sets:
The statistical operation parameter -"statistic" codes.
Generated Narrative: CodeSystem observation-statistics
Last updated: 2025-11-24T20:46:00.1Z
This
case-sensitive
code
system
http://terminology.hl7.org/CodeSystem/observation-statistics
http://hl7.org/fhir/observation-statistics
defines
the
following
codes:
| Code | Display | Definition | Copy |
| average | Average |
The
|
 |
| maximum | Maximum |
The
|
|
| minimum | Minimum |
The
|
|
| count | Count |
The [number] of valid measurements over the stated period that contributed to the other statistical outputs. |
|
| total-count | Total Count |
The total [number] of valid measurements over the stated period, including observations that were ignored because they did not contain valid result values. |
|
| median | Median |
The
|
|
| std-dev | Standard Deviation |
The
|
|
| sum | Sum |
The
|
|
| variance | Variance |
The
|
|
| 20-percent | 20th Percentile |
The
20th
|
|
| 80-percent | 80th Percentile |
The
80th
|
|
| 4-lower | Lower Quartile |
The
lower
|
|
| 4-upper | Upper Quartile |
The
upper
|
|
| 4-dev | Quartile Deviation |
The
difference
between
the
upper
and
lower
|
|
| 5-1 | 1st Quintile |
The lowest of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population. |
|
| 5-2 | 2nd Quintile |
The second of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population. |
|
| 5-3 | 3rd Quintile |
The third of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population. |
|
| 5-4 | 4th Quintile |
The fourth of four values that divide the N measurements into a frequency distribution of five classes with each containing one fifth of the total population. |
|
| skew | Skew |
Skewness
is
a
measure
of
the
asymmetry
of
the
probability
distribution
of
a
real-valued
random
variable
about
its
mean.
The
skewness
value
can
be
positive
or
negative,
or
even
undefined.
Source:
|
|
| kurtosis | Kurtosis |
Kurtosis
is
a
measure
of
the
"tailedness"
of
the
probability
distribution
of
a
real-valued
random
variable.
Source:
|
|
| regression | Regression |
Linear
regression
is
an
approach
for
modeling
two-dimensional
sample
points
with
one
independent
variable
and
one
dependent
variable
(conventionally,
the
x
and
y
coordinates
in
a
Cartesian
coordinate
system)
and
finds
a
linear
function
(a
non-vertical
straight
line)
that,
as
accurately
as
possible,
predicts
the
dependent
variable
values
as
a
function
of
the
independent
variables.
Source:
|
|
See the full registry of code systems defined as part of FHIR.
Explanation of the columns that may appear on this page:
| Level | A few code lists that FHIR defines are hierarchical - each code is assigned a level. See Code System for further information. |
| Source | The source of the definition of the code (when the value set draws in codes defined elsewhere) |
| Code | The code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract') |
| Display | The display (used in the display element of a Coding ). If there is no display, implementers should not simply display the code, but map the concept into their application |
| Definition | An explanation of the meaning of the concept |
| Comments | Additional notes about how to use the code |
FHIR
®©
HL7.org
2011+.
FHIR
Release
4
(Technical
Correction
#1)
(v4.0.1)
R6
hl7.fhir.core#6.0.0-ballot3
generated
on
Fri,
Mon,
Nov
1,
2019
09:32+1100.
QA
Page
24,
2025
20:48+0000.
Links:
Search
|
Version
History
|
Table
of
Contents
|
Credits
Glossary
|
QA
|
Compare
to
R3
R4
|
Compare
to
R5
|
Compare
to
Last
Ballot
|
|
Propose
a
change