Leukocytes [#/volume] in Blood by Estimate 49498-9
LOINC Code
| LOINC code | 49498-9 | ||
|---|---|---|---|
| name | Leukocytes [#/volume] in Blood by Estimate | ||
| description | In 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 WBC estimate count is a manual quantitative count. We report a number. See laboratory procedure: A. WBC Count Smear Estimate: 1. Use the 50X oil immersion objective. 2. Count the number of both intact and disrupted WBCs in each of 10 microscopic fields in different areas of the slide where RBCs slightly overlap. Divide the total number by 10 to establish the mean number of WBCs/field and multiply this mean by 3,000 to get the estimated WBC count/mm³. Do not round off the mean, e.g., if the mean is 5.7 do not round off to 6 but leave the figure at one place past the decimal point for greater accuracy. 3. If the quantitative WBC count is <25,000, the estimated smear count should be within 1,500 cells of this figure. Estimate counts are less reliable at >25,000 cells/mm³. 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. | ||
| status | ACTIVE | ||
Fully-Specified Name | |||
| component | Leukocytes | ||
| property | NCnc = Number Concentration (count/vol) | ||
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | ||
| system | Bld = Whole blood | ||
| scale | Qn = 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 | Estimate | ||
Additional Names | |||
| short name | WBC # Bld Est | ||
Basic Attributes | |||
| class | HEM/BC | ||
| type | 1 Laboratory | ||
| order vs. observation | Observation | ||
| example UCUM units | 10*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 unit | 10*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 | |||
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History/Usage | |||
| test rank | 16378 of 2000 most commonly performed tests by labs in USA | ||
| first released | |||
| last updated | 2.73 | ||
| last change type | MIN - change to field other than name | ||
Related Names | |||
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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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