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ISSN: 2165-7831
Journal of Blood & Lymph
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Establishing Reference Ranges of Hematological Parameters from Malian Healthy Adults

Kone B1, Maiga M1,2,3, Baya B1, Sarro YDS1*, Coulibaly N1, Kone A1, Diarra B1, Sanogo M1, Togo ACG1, Goita D1, Dembele M1, Polis MA4, Warfield J2, Belson M4, Dao S1, Orsega S4, Murphy RL3, Diallo S1 and Siddiqui S4

1University of Sciences, Techniques and Technologies of Bamako, Mali

2Leidos Biomedical Research, Inc., in support to NIAID, Bethesda, Maryland, USA

3Northwestern University, Chicago, Illinois, USA

4National Institute of Allergic and Infectious Diseases (NIAID), Bethesda, Maryland, USA

*Corresponding Author:
Sarro YDS
SEREFO, University of Sciences
Techniques and Technologies of Bamako (USTTB), BP. 1805
Tel: 00223 2022 6786
Fax: 00223 2022 7513
E-mail: [email protected]

Received Date: January 29, 2017; Accepted Date: March 02, 2017; Published Date: March 15, 2017

Citation: Kone B, Maiga M, Baya B, Sarro YDS, Coulibaly N, et al. (2017) Establishing Reference Ranges of Hematological Parameters from Malian Healthy Adults. J Blood Lymph 7:154. doi: 10.4172/2165-7831.1000154

Copyright: © 2017 Kone B, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Introduction: Measurement of immuno-hematological parameters has been historically helpful in the diagnosis and treatment monitoring of many infectious diseases and cancers. However, these parameters have not yet been established in many developing countries where patient care strongly relies on such low-cost tests. This study describes the immuno-hematological parameter ranges for Malian healthy adults. Methods: A cross sectional study was conducted from August 2004 to May 2013. We included 213 healthy volunteers (173 male and 40 female), aged between 18-59 years. Median, 2.5 and 97.5 percentile ranges for each immuno-hematological parameter are presented. Results: In our study population, the hematological parameters’ ranges were mostly different to the universal established ranges. We found in our population a Median white blood cell (WBC) count of 5200 cells/μL [3237.5- 11900], Red Blood Cell (RBC) count of 4.94 10^6 [3.56-6.17], hemoglobin (Hb) of 14.2 g/dL [12.2-17.38], platelet count (Plt) of 275 10^3/μL [145.4-614.4], lymphocytes 2050/μL [1200-3800], neutrophils 2200/μL [1040-6220]; monocytes 200/μL [100-660]; eosinophils 131/μL [0-1026]; CD4 902 cells/μL [444-1669] and CD8 485 cells/μL [0- 1272]. We found significant gender differences in RBC, Hb level and MPV. However, RBC and Hb were higher in males median values compared to females (median values) (p<0.001), whereas the Mean platelet volume lower values (MPV) in males than females (P<0.047). The hemoglobin level for some West African countries (Mali, Burkina Faso, Togo, and Nigeria) ranged from 13.5 to 15.1 g/dL for males and 12 to 13 g/dL for females. However in East and Southern Africa, the values were anywhere from 14.1 to 16.1 for males and 11.2 to 14.4 for females. Conclusion: Our data may help physicians to better define hematological abnormalities in patients. They may also be used to define new “normal hematological values” in Malian population or in the whole West African population.


Hematology; Adults; Mali


Hematological and immunological parameter references ranges are widely used in clinical practice to assess health and disease conditions. The reference ranges could also be important tools as biomarkers to assess disease progression or response to therapy [1]. These parameters may vary depending on age, gender, race, environmental and genetic background [2]. Recent improvements in counting peripheral blood cells has given the field of hematology enormous clinical and scientific advantages [3-5], and more availability and access to such data to clinicians worldwide. The reference ranges universally used are mostly from studies conducted in Western countries even though they are sometimes different to those of other populations across the world. In Mali, studies determining hematological parameters have mostly been conducted in infants and children [6-7]. However no study has described the Immuno-hematological parameters in healthy adult subjects.

Materials and Methods

Study design, setting and population

A cross sectional study was conducted from August 2004 to May 2013. Participants were recruited at Point-G University Teaching Hospital and the laboratory testing was done at the SEREFO laboratory of the University of Sciences, Techniques and Technologies of Bamako (USTTB). The study population consisted of healthy volunteers aged 18 years or older, living in Bamako and willing to be part of the study. We defined a healthy volunteer, as a participant with no clinical evidence of TB or HIV and no physical symptom of illness for more than 2 weeks before enrollment, including no evidence of fever, or weight loss.

Two hundred and thirteen volunteers were enrolled consecutively after signing informed consent. Pre-screening tests included a physical examination and rapid hemoglobin testing using HemoCue Hb 201+ (USA/CANADA, FRIWO, Mod nr FE3515060D035) and pregnancy testing for women. Volunteers with a normal physical exam, a hemoglobin level more than 10 g/dL and women with a negative pregnancy test were enrolled in the study. This research protocol was approved by the Ethics Committee of the USTTB, Mali and the Institutional Review Board of the National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda. Maryland.

Laboratory methods

HIV status determination: Whole blood was collected in 5 mL of serum separating tube (BD Vacutainer® plus, Becton 17 K2EDTA, Becton Dickinson, Franklin Lakes, NJ, USA). HIV testing was performed using the following algorithm: A rapid test was done using Determine® (HIV-1/2, Abbott Laboratories, Matsudo-Shi, Chiba, Japan) for all the participants, followed by an ELISA test (Genscreen Ag-Ac UltraHIV-1/2 version 2 Assay, Bio-Rad Laboratories, Marnes, France). Any positive ELISA was further confirmed by Western Blot testing (New Lav Blot I/II (New Lav Blot I and II, Bio-Rad Laboratories, Marnes, France).

Hematological parameters testing: A coulter counter analyzer (Coulter Ac T diff, Beckman Coulter, Miami, FL) standardized by 4C plus control blood was used. The following hematological parameters were measured: White Blood Cell (WBC), Red Blood Cell (RBC), hemoglobin (Hb), hematocrit (Hct), Mean Cell Volume (MCV), Mean Cell Hemoglobin (MCH), mean Cell Hemoglobin Concentration (MCHC), Red Cell Distribution Width (RDW), platelet count (Plt), and Mean Platelet Volume (MPV). A Blood smear was also performed for manual WBC cell differentiation and determination of percentages and absolute values of Lymphocytes, Neutrophils, Eosinophils, Basophils and Monocytes for each participant.

All laboratory equipment used had passed Quality controlled assessment with Interlaboratory Quality Assurance Program (IQAP) and the College of American Pathologist (CAP-FH2) programs which is performed on a yearly basis since 2004.

Flow cytometry testing: CD4 and CD8 T Lymphocyte counts were performed using a FacsCalibur (FASCalibur, BD, Biosciences, San Jose, CA, USA). Whole blood was stained using a lyse/wash immunophenotyping procedure. One hundred microliter of peripheral whole blood was added into a polystyrene tube containing 20 μL of a monoclonal antibody cocktail of anti-CD3 Fluorescein isothiocyanate (FITC), anti-CD8 Phycoerythrin (PE), anti-CD45 Peridinin chlorophyll protein coupled to the cyanine dye CyTM 5.5 (PercCp-Cy5.5) and anti- CD4 allophycocyanin (APC). Cells and antibodies were then incubated in dark for 15 min at room temperature. Thereafter, 2 mL of lysis buffer (BD Biosciences, San Jose, CA, USA) was added to the cells and kept for 10 min in dark at room temperature to allow red cell lyses.

Cells were then washed twice with 2 mL of BD Wash Buffer (Becton Dickinson) and re-suspended in 200 μL of BD Wash Buffer for acquisition with a four-color flow cytometer (FASCalibur, BD Biosciences, San Jose, CA, USA). Data were later analyzed with FlowJo software (Tree Star inc. Ashland, Oregon, USA).

Data and Statistical Analysis: Data were collected using study specific case report forms by a physician and upon validation was entered into an electronic clinical database (CRIMSON system (version 1.0)). Statistical analysis was performed using SPSS (version 16.0). The percentile range (2.5%-97.5%) was used to determine the higher and lower values of normal ranges.


Two hundred and fifty one (251) volunteers were screened during the study period, 15.1% (38/251) of whom were HIV positive and were therefore excluded from our analysis. Data from the remaining 213 volunteers were analyzed. Eighty one percent (173/213) were men and 19% (40/213) were women. The median age was 25.5 years (22-31.5).

The 2.5-97.5 percentile intervals and median values for each hematological parameters from the general population were mostly different to what comes with the instruments and usually used in routine laboratories in Mali (Tables 1 and 2). The immunohematological parameters analysis by gender shows a median WBC count of 5200 cells per microliter with a range of (3075-11137) for men and 4700 cells/ mL (3800-12500) for women but the difference was no statistically significant. Median Hemoglobin for males was 14.5 g/dL (12.4-17.6) and 12.8 g/dL (12.0-14.9) for females. For RBC, the median is 5.14 × 10^6/μL (4.16-6.23) for men and 4.67 × 10^6/μL (3.88- 5.73) for women. The statistical difference for both parameters were significant (p=0.001) (Table 2). The median MPV for males was lower than females’ MPV and this difference was significant. The lymphocytes median value was 2100 cells/μL for males and 2200 cells/μL for females. The range for hematological parameters according to gender and age ranges are described in Table 3. The neutrophil count ranged in males from 1000 to 4400 cells/μL and 1200 to 7400 cells/μL for females. The monocytes’ range was 100-660 cells/μL for males and 100-500 cells/μL for females. The eosinophils’ range was 0-1026 cells/μL for males and 0-3405 cells/μL for females. The CD4 and CD8 ranges in males were respectively [468-1636] cells/μL, [312-1272] cells/μL and for females [391-1748] cells/μL, and [364-1748] cells/μL (Table 2). There was no statistically significant gender difference in the median platelet counts.

Parameters n Male Female
Lab Value (n=173) Range for routine Lab Lab Value (n=40) Range for routine Lab
WBC (/µL) 5200 (3075-11137) (4000-10000) 4700 (3800-12500) (4000-10000)
RBC (× 10^6 /µL) 5.14 (4.16-6.23) (4.50-5.50) 4.67 (3.88-5.75) (4.20-5.20)
Hb (g/dL) 14.5 (12.4-17.6) (13,0-16,0) 12.8 (12.0-14.9) (11,5-15,0)
Hct (%) 43.5 (33.2-54.6) (40.0-54.0) 39.5 (26.8-52.5) (37.0-47.0)
MCV (fL) 87.3 (72.3-97.7) (75-95) 86.0 (39.2-118.0) (75.0-95.0)
MCH (pg) 28.6 (22.8-33.7) (30-35) 28.4 (23.1-34.8) (30-35)
MCHC (g/dL) 33.0(30.9-34.9) (30-35) 32.5 (30.9-34.5) (30-35)
RDW (%) 13.4 (11.9-17.1) (10-15) 13.7 (11.6-24.3) (10-15)
Plt (× 10^3/µL) 259 (133-460) (150-500) 291 (151-532) (150-500)
MPV (fL) 7.8 (5.7-9.4) (6.5-11) 8.0 (6.0-10.5) (6.5-11)
Neutrophils (/µL) 2200 (1000-4400) (2500-7500) 2200 (1200-7400) (2500-7500)
Lymphocytes (/µL) 2100 (1200-3800) (1000-4000) 2200 (1400-4600) (1000-4000)
Monocytes (/µL) 200 (100-660) (400-1000) 200 (100-500) (400-1000)
Eosinophils (/µL) 165 (0-1026) (40-500) 74 (0-825) (40-500)
Basophils (/µL) 37 (0-108) (inf-100) 0 (0-108) (inf-100)
CD4 Count (cells/µL) 915 (468-1636) N/A 902 (391-1748) N/A
CD8 Count (cells/µL) 483 (312-1272) N/A 494 (364-1748) N/A

Table 1: Gender differences in immuno-hematological parameters: median, 2.5 and 97.5 percentile reference range.

Parameter Men age (Years) n Range values Female age (years) n Range values
WBC (/µL) 18-49 163 2972-8802 18-49 40 3800-12500
50-59 11 3900-26500      
RBC (× 10^6 /µL ) 18-49 163 4.15-6.24 18-49 40 3.88-5.75
50-59 11 4.24-6.14      
Hb (g/dL) 18-49 163 12.4-17.5 18-49 40 12.0-14.9
50-59 11 14.0-17.9      
HCT (%) 18-49 163 33.1-54.6 18-49 40 26.8-52.5
50-59 11 37.2-54.6      
MCV(fL) 18-49 163 72.1-96.4 18-49 40 39.2-118.0
50-59 11 72.7-101.1      
MCH (pg) 18-49 163 23.1-32.9 18-49 40 23.1-34.8
50-59 11 22.8-35.1      
MCHC (g/dL 18-49 163 30.9-34.7 18-49 40 30.9-34.5
50-59 11 31.4-36.0      
RDW (%) 18-49 163 11.9-17.4 18-49 40 11.6-24.3
  50-59 11 12.3-16.3      
PLT (× 10^3) 18-49 163 142-482 18-49 40 151-532
50-59 11 117-332      
MPV (FL) 18-49 163 5.6-9.3 18-49 40 6.0-10.5
50-59 11 6.1-9.8      
Neutrophils (× 10^2 /µL ) 18-49 163 1000-4462 18-49 40 1200-7400
50-59 11 1800-2400      
Lymphocytes (× 10^2 /µL) 18-49 163 1200-3800 18-49 40 1400-4600
50-59 11 1800-2800      
Monocytes (× 10^2/µL ) 18-49 163 100-672 18-49 40 100-500
50-59 11 0-400      
Eosinophils (× 10^2/µL) 18-49 163 0-1006 18-49 40 0-825
50-59 11 0-1508      
Basophils (× 10^2 µL ) 18-49 163 0-110 18-49 40 0-108
50-59 11 0-100      
CD4 Counts (× 10^2 cells/µL ) 18-49 163 468-1656 18-49 40 391-1748
50-59 11 480-999      
CD8 Counts (× 10^2 cells/µL) 18-49 163 0-1263.6 18-49 40 364-1748
50-59 11 0-1272.0      

Table 2: Immuno-hematological parameters of 2.5 and 97.5 percentile reference range according to age and gender.

Study WBC (10^9/liter) RBC 10^12/liter Hemoglobin (g/dl) Neutrophil (%) Platelet(10^9/liter) Lymphocyte (%)
  Male Female Male Female Male Female Male Female Male Female Male Female
Our Study 5.2 4.7 5.1 4.7 14.5 12.8 44 48 259 291  2.1*  2.2*
N=213 (3.07-11.1) (3.8-12.5) (4.1-6.2) (3.9-5.7) (12.4-17.6) (12.0-14.9) (26-66) (26-67) (133-460) (151-460) (1.2-3.8) (1.2-7.4)
(18-59) years                        
Burkina (7)                        
N=186 5.1 5.2 4.7 4.2 13.5 12 43 46 217 252 2.1  2.2*
(18-78 ) years (3.2-9.2) (3.4-7.4) (11.3-15.6) (3.5-4.9) (11.3-15.6 (9.813.5) (27-64) (30-62) (127-365) (159-356) (1.3-4.0)* (1.4-3.2)
Togo (8) 4.1 4.2 5 4.5 15.1 13  1.6* 1.6* 236 247  2.1*  2.2*
N=1379 (1.9-10.1) (2.2-7.8) (3.3-6.4) (3.1-6.0) (10-18.4) (10.3-17.1) (0.5-5.4) (0.5-4.4) (120-443) (150-436) (1.1-4.3) (1.2-4.3)
(15-58) years                        
Nigeria (9) 4.4 4.5 5.2 4.56 14.3 12.8 53 51 213 236 40 41
N=383 (4.3-4.6) (4.4-4.8) (5.1-5.3) (5.5-5.3) (14.0-14.4) (12.4-13.1) (52.6-55.2) (49.1-52.3) (206.8-226.8) (229.3-251.2) (37.4-40.2) (39.0-42.1)
(18-65) years                        
Ethiopia(11) N=485** 5.9 5.9 5 4.5 16.1 14.4     203 193  1801*  1701*
(15-45) years (3.0± 9.8) (3.0± 12.2) (4.3± 5.9) (3.7± 5.2) (13.9± 18.3) (12.2± 16.6) NA NA (97± 324) (98± 352) (956±3474) (1098±3487)
Mozambique (15) 4.6 5.6 5.1 4.2 14.1 11.2 52.5 57.1 231.1 269  1.8*  1.9*
N=257 (2.9-7.7) (3.2-9.1) (2.7-6.1) (2.3-5.0) (12.3-16.4) (7.0-13.1) (34.4-70.8) (37.0-76.7) (116.2-392.1) (128.8-503) (1.1-3.3) (1.0-3.1)
(18-24) years                        
Tanzania (12) 4.4 4.8 5.2 4.6 15.4 13.5 47.5 48.4 224 271  1.8*  1.9*
N=301 (2.8-7.9) (3.2-8.0) (4.4-6.3) (3.8-5.5) (13.7-17.7) (11.1-15.7) (31.7-69.3) (32.5-71.3) (147-356) (151-425) (1.1-2.8) (1.1-3.1)
(19-48) years                        
Uganda (2)     4.9 4.5 14.1 12.5     171 198    
N=845 NA NA (3.8-6.0) (3.7-5.3) (11.1-16.8) (10.1-14.3) NA NA (80-288) (100-297) NA NA
>24 years                        

Table 3: Immuno-hematological parameters’ comparison with other studies in Africa.


Our data show differences with the reference data that come with the instruments and used in Mali routine laboratories. This study is the first to the best or our knowledge to determine hematological ranges in Malian adult population. However, because of limited sample size, our data cannot be extrapolated to the entire country. We found significant gender differences in RBC, Hb and MPV in the participants. RBC and Hb were higher in males than females (P< 0.001), and lower value MPV in males when compare to female (P< 0.047). These lower values are consistent with the differences usually seen globally and may be explained by menstrual blood loss [8]. The median value of hemoglobin for West African countries like Mali, Burkina Faso, Togo, and Nigeria ranged from 13.5 to 15.1 g/dL for males and 12 to 13 g/dL for females [911]. However for East and southern Africa these values were anywhere from 14.1 to 16.1 for males and 11.2 to 14.4 for the females.

These higher values for Eastern and Southern African populations when compared to West Africans are attributed to the impact of the high altitude in those regions leading to decreased oxygen in the air, and increased hematopoiesis in these populations [12].

In this study, we established the baseline immuno-hematological values in adult healthy volunteers in Malian population. Simple and easy to perform tests such as Blood Cell Counts are valuable in developing countries where lack of infrastructure and resources prevent more sophisticated and expensive tests. Physicians usually have to rely on symptoms alone to diagnose diseases. Current “normal values” are usually based on a Caucasian population and may not be applicable universally. Therefore it is important to determine the basic parameters for each genetically distinct population. It has to be noted that most of these parameters by themselves are not sufficient to diagnose diseases as they are not specific to a single disease. However, when combined with disease symptoms, epidemiological context and clinical signs, they could be very helpful to orient to diagnostic hypotheses.

In this study the median WBC absolute count was 5200 cells per microliter with a range of [3075-11137] for men and 4700 cells/ mL [3800-12500] for women. There was no significant gender difference and our data are similar to other studies from Burkina Faso in West Africa and Ethiopia in East Africa [13]. However, these ranges are wider than that were found elsewhere in Africa [14]. Our ranges are different from the reference ranges used in Mali routine laboratories (Table 2). These data used by the routine laboratories are from the instruments’ manufacturer established from Western populations who are genetically, environmentally, socially and/or culturally different from African populations [15,16].

The hemoglobin ranges from this study were similar to Gambian values in men, but different in female [1]. We could explain this difference by our inclusion criteria of Hb level greater than 10 g/dL. Also the Eosinophil count in Mali ranged above the expected “normal” range in men and women. This is important as it may suggest exposure to allergens or hypersensitivity creating agents in the environment. It has to be noted that our inclusion criteria of Hb>10.5 may pick some borderline anemic subjects. Similarly, the females included were in the age of 18-49, and menstrual bleeding may influence the study outcomes. However, these hypotheses are less likely given the similarity of our data with previous findings in West Africa.

The CD4 and CD8 T-cell counts’ ranges in males were respectively [468-1636] cells/μL, [312-1272] cells/μL and for females [391-1748] cells/μL, [364-1748] cells/μL. The CD4 and CD8 T-cells counts ranges were similar to Uganda, Tanzanian, and Mozambique reports [2,14,17]. Some studies in Africa have shown that the median platelet count is significantly higher in females than males [17]. However, we did not find any statistically significant gender difference in our study population regarding platelets values.

It has to be noted that lower and higher ranges in this study is more meaningful than the statistically significance in the differences.


This study was carried out to describes the local hematological and immunological parameters within Malian adults healthy volunteers, and our data have shown different parameter ranges, which can be utilized by physicians to help clinicians investigate diseases. We also demonstrated that the universally defined “normal values” are not always applicable to our Malian population.


The authors would like to acknowledge all SEREFO/UCRC staff, laboratory and clinical who contributed to patient recruitment, sample processing and data collection. We are immensely grateful to the volunteers who participated in the study.


BK, SS, MM, YSS, BB, BD, NC, MP, JW, SDa, SDi conceived and developed the protocols; BK, MM, BB, YSS, NC, AK, BD, MS, ACG, DG, MD, JW, MB, SO, RLM and SS helped in the protocol development; BK, MM, BB, YSS, NC, AK, BD, MS, ACG, DG, MD, JW, MB, SO, RLM led the study; BK, BB, YSS, NC, AK, BD, MS, ACG, DG, MD, JW, MB were instrumental in data generation and laboratory assays; BK, BB, YSS, NC, AK, BD, MS, ACG, DG, MD, JW, MB, SS collated, reviewed and interpreted data and contributed to the writing of the manuscript. BK, MM, BB, BD, YSS, SS wrote the first draft; and BK, MM, BB, BD, YSS, SS reviewed the drafts. SS, RLM, SDi, SDa provided mentoring for this work. All authors had access to the data and reviewed the manuscript.

Conflict of Interest

The authors declare no conflict of interest.


This project was supported by the National Institutes of Allergy and Infectious Diseases intramural funding and grants (AI069471, AI110386, and TW010350).

This project has been funded in whole or in part with federal funds from the National Cancer Institute, National Institutes of Health, under Contract No. HHSN261200800001E. The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the US Government.


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