Table of Contents

Locator Record

Title: Complete Blood Count (LAB25 )
Contact Number: 1-866-441-NCHS
Years of Content: 1999 - 2000
First Published: June, 2002
Revised: April, 2006
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Complete Blood Count
Record Source: NHANES 1999 - 2000
Survey Methodology: NHANES 1999 - 2000 is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files

Component Description

Instrument

The Beckman Coulter MAXM instrument in the Mobile Examination Center (MEC) produces a complete blood count on blood specimens and provides a distribution of blood cells for all participants.

Eligible Sample

Participants were 1+ years of age.

Description of Laboratory Methodology

Examination Protocol

Detailed specimen collection and processing instructions are discussed in NHANES Laboratory/Medical Technologists Procedures Manual (LPM). The analytical method used by MEC medical technologists is in the Analytic Methodology section.

Analytic Methodology

CBC Parameters

The methods used to derive complete blood count (CBC) parameters are based on the Beckman Coulter method of counting and sizing, in combination with an automatic diluting and mixing device for sample processing, and a single-beam photometer for hemoglobinometry. The white blood count (WBC) differential uses VCS technology. See Chapter 7 of the NHANES Laboratory/Medical Technologists Procedures Manual for details.

 

Analytic Notes

Derived variables were created using the following calculation:

LBDLYMNO = LBXWBCSI * LBXLYPCT/100
LBDMONO = LBXWBCSI * LBXMOPCT/100
LBDNENO = LBXWBCSI * LBXNEPCT/100
LBDEONO = LBXWBCSI * LBXEOPCT/100
LBDBANO = LBXWBCSI * LBXBAPCT/100

The five counts (variable names) were:

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Both males and females 1 YEARS - 150 YEARS

LBXWBCSI - White blood cell count (SI)

Variable Name:
LBXWBCSI
SAS Label:
White blood cell count (SI)
English Text:
White blood cell count: SI
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.4 to 20.7 Range of Values 7981 7981
. Missing 851 8832

LBXLYPCT - Lymphocyte percent (%)

Variable Name:
LBXLYPCT
SAS Label:
Lymphocyte percent (%)
English Text:
Lymphocyte percent (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.5 to 78.8 Range of Values 7949 7949
. Missing 883 8832

LBXMOPCT - Monocyte percent (%)

Variable Name:
LBXMOPCT
SAS Label:
Monocyte percent (%)
English Text:
Monocyte percent (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 31.3 Range of Values 7949 7949
. Missing 883 8832

LBXNEPCT - Segmented neutrophils percent (%)

Variable Name:
LBXNEPCT
SAS Label:
Segmented neutrophils percent (%)
English Text:
Segmented neutrophils percent (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5.3 to 91.3 Range of Values 7949 7949
. Missing 883 8832

LBXEOPCT - Eosinophils percent (%)

Variable Name:
LBXEOPCT
SAS Label:
Eosinophils percent (%)
English Text:
Eosinophils percent (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1 to 57.2 Range of Values 7949 7949
. Missing 883 8832

LBXBAPCT - Basophils percent (%)

Variable Name:
LBXBAPCT
SAS Label:
Basophils percent (%)
English Text:
Basophils percent (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 35.4 Range of Values 7949 7949
. Missing 883 8832

LBDLYMNO - Lymphocyte number

Variable Name:
LBDLYMNO
SAS Label:
Lymphocyte number
English Text:
Lymphocyte number
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.3 to 16.1 Range of Values 7948 7948
. Missing 884 8832

LBDMONO - Monocyte number

Variable Name:
LBDMONO
SAS Label:
Monocyte number
English Text:
Monocyte number
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1 to 2.2 Range of Values 7948 7948
. Missing 884 8832

LBDNENO - Segmented neutrophils number

Variable Name:
LBDNENO
SAS Label:
Segmented neutrophils number
English Text:
Segmented neutrophils number
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.3 to 15.4 Range of Values 7948 7948
. Missing 884 8832

LBDEONO - Eosinophils number

Variable Name:
LBDEONO
SAS Label:
Eosinophils number
English Text:
Eosinophils number
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 4.2 Range of Values 7948 7948
. Missing 884 8832

LBDBANO - Basophils number

Variable Name:
LBDBANO
SAS Label:
Basophils number
English Text:
Basophils number
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 4.5 Range of Values 7948 7948
. Missing 884 8832

LBXRBCSI - Red cell count SI

Variable Name:
LBXRBCSI
SAS Label:
Red cell count SI
English Text:
Red cell count SI
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.28 to 6.89 Range of Values 7982 7982
. Missing 850 8832

LBXHGB - Hemoglobin (g/dL)

Variable Name:
LBXHGB
SAS Label:
Hemoglobin (g/dL)
English Text:
Hemoglobin (g/dL)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
7.4 to 19.2 Range of Values 7982 7982
. Missing 850 8832

LBXHCT - Hematocrit (%)

Variable Name:
LBXHCT
SAS Label:
Hematocrit (%)
English Text:
Hematocrit (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
21.3 to 54.9 Range of Values 7982 7982
. Missing 850 8832

LBXMCVSI - Mean cell volume (fL)

Variable Name:
LBXMCVSI
SAS Label:
Mean cell volume (fL)
English Text:
Mean cell volume (fL)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
51.1 to 120.6 Range of Values 7982 7982
. Missing 850 8832

LBXMCHSI - Mean cell hemoglobin (pg)

Variable Name:
LBXMCHSI
SAS Label:
Mean cell hemoglobin (pg)
English Text:
Mean cell hemoglobin (pg)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
15 to 43.9 Range of Values 7982 7982
. Missing 850 8832

LBXMC - MCHC (g/dL)

Variable Name:
LBXMC
SAS Label:
MCHC (g/dL)
English Text:
Mean cell hemoglobin concentration (g/dL)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
29.4 to 38.3 Range of Values 7982 7982
. Missing 850 8832

LBXRDW - Red cell distribution width (%)

Variable Name:
LBXRDW
SAS Label:
Red cell distribution width (%)
English Text:
Red cell distribution width (%)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
10.5 to 28.2 Range of Values 7982 7982
. Missing 850 8832

LBXPLTSI - Platelet count (%) SI

Variable Name:
LBXPLTSI
SAS Label:
Platelet count (%) SI
English Text:
Platelet count (%) SI
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11 to 708 Range of Values 7982 7982
. Missing 850 8832

LBXMPSI - Mean platelet volume (fL)

Variable Name:
LBXMPSI
SAS Label:
Mean platelet volume (fL)
English Text:
Mean platelet volume (fL)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5.5 to 13.2 Range of Values 7982 7982
. Missing 850 8832