Platelets [#/volume] in Blood by Estimate   49497-1

LOINC Code


LOINC code49497-1
namePlatelets [#/volume] in Blood by Estimate
descriptionIn the Hematology world estimated cell counts have existed for many moons and they are reported either qualitatively or quantitatively and done strictly by blood smear review. Smear Estimated WBC and Platelet counts that aren't just reported as reduced/adequate/many that are actually estimated as a numeric result like an estimate of 4 K/cumm for WBC or 400 K/cumm for platelets. Like doing a retic count by counting so many fields on the smear type of estimate. This Platelet estimate count is a manual quantitative count. We report a number. See laboratory procedure: B. Platelet Count Smear Estimate: 1, Use the 100X oil immersion objective. 2. Estimate the average number of platelets per field using 10 different fields, where the RBCs are evenly dispersed. Avoid field in which RBCs strongly overlap as this will falsely increase the platelet estimate. Multiply this result by 20,000 to obtain an approximation of the platelet count. 3. A normal platelet count would show 8-20 plt/field; or one platelet per 10-30 RBCs. 4. NOTE: If platelet clumps or satellitism are seen, an estimate cannot be performed. Notify physician of problem. If indicated advise redraw in the appropriate anticoagulant, sodium citrate (blue-top). Order will need to be placed for a CBC SODIUM CITRATE test. This will automatically order both lav & blue tubes. III. REFERENCES: A. A Color Atlas and Instruction Manual of Peripheral Blood Cells Morphology, by Barbara H. O'Connor, 1984, p. 20. B. Principles and Procedures, Barbara A. Brown, 6th Edition, 1993, p. 104.
statusACTIVE

Fully-Specified Name

componentPlatelets
propertyNCnc  =  Number Concentration (count/vol)
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
methodEstimate

Additional Names

short namePlatelet # Bld Est

Basic Attributes

classHEM/BC
type1  Laboratory
order vs. observationBoth
example UCUM units10*3/uL
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 unit10*3/mm3

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 Groups

LG32892-8Platelets|NCnc|Pt|Bld

History/Usage

test rank316 of 2000 most commonly performed tests by labs in USA
first released
last updated2.73
last change typeMIN  - change to field other than name

Related Names

#
ABS
absolute
absolutes
Blood
Cnt
Count
Count/volume
CT
estimation
HEMATOLOGY/CELL COUNTS
Number concentration
Number Concentration (count/vol)
Platelet
Platelet count
Platelt
Plt
Point in time
QNT
Quan
Quant
Quantitative
Random
Thrb
Thrombocyte
Thrombocytes
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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