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[11]                                                                                                                                                                                                                                              AJDHS.COM 

 

 

Available online at ajdhs.com 

Asian Journal of Dental and Health Sciences 
Open Access to Dental and Medical Research 

Copyright  © 2025 The  Author(s): This is an open-access article distributed under the terms of the CC BY-NC 4.0 
which permits unrestricted use, distribution, and reproduction in any medium for non-commercial use provided the 

original author and source are credited  

 

 

Diagnostic Challenges in Maternal Anemia: Mentzer Index in Clinical Practice 

Emmanuel Ifeanyi Obeagu *  

Department of Biomedical and Laboratory Science, Africa University, Zimbabwe 

Article Info: 
_____________________________________________ 
Article History: 

Received   05 Nov 2024     
Reviewed  09 Dec 2024 
Accepted   12 Jan 2025 
Published 15 March 2025 

_____________________________________________ 
Cite this article as:  

Obeagu EI, Diagnostic Challenges in Maternal 
Anemia: Mentzer Index in Clinical Practice, 
Asian Journal of Dental and Health Sciences. 2025; 
5(1):11-14                                                                     

DOI: http://dx.doi.org/10.22270/ajdhs.v5i1.108           

Abstract 
_________________________________________________________________________________________________________________ 

Maternal anemia is a significant health concern during pregnancy, as it poses risks for both maternal 
and fetal well-being. Two common causes of microcytic anemia in pregnant women are iron 
deficiency anemia (IDA) and thalassemia trait (TT). Distinguishing between these conditions is 
crucial, as their management differs substantially. The Mentzer Index (MI), a simple diagnostic tool, 
is commonly used to differentiate between IDA and TT based on the mean corpuscular volume 
(MCV) and red blood cell (RBC) count. However, while the MI is widely used due to its simplicity and 
cost-effectiveness, its accuracy can be influenced by various factors, including the presence of mixed 
anemia, laboratory errors, and coexisting conditions. This review explores the diagnostic challenges 
of maternal anemia and evaluates the role of the Mentzer Index in clinical practice. We discuss how 
the MI can be helpful in initial screening, particularly in resource-limited settings, but highlight its 
limitations in cases of complex anemia, such as when thalassemia trait coexists with iron deficiency. 
We also examine the role of complementary diagnostic methods, such as serum ferritin, hemoglobin 
electrophoresis, and genetic testing, which can improve diagnostic accuracy and guide treatment 
decisions.  

Keywords: Maternal anemia, Mentzer Index, diagnostic challenges, iron deficiency anemia, 
thalassemia trait 

*Address for Correspondence:   

Emmanuel Ifeanyi Obeagu, Department of Biomedical and Laboratory Science, Africa University, Zimbabwe 

 

Introduction 

Anemia during pregnancy is a global health issue that 
affects millions of women, with significant 
consequences for both maternal and fetal health. It is a 
condition characterized by a reduction in hemoglobin 
levels, leading to inadequate oxygen supply to the 
body's tissues. In pregnancy, anemia is particularly 
concerning due to the increased metabolic demands 
placed on the body, which can result in complications 
such as preterm birth, low birth weight, and even 
maternal mortality. Anemia during pregnancy can be 
caused by a variety of factors, including nutritional 
deficiencies, chronic diseases, and inherited blood 
disorders, with iron deficiency anemia (IDA) and 
thalassemia trait (TT) being two of the most common 
causes of microcytic anemia.1-2 Iron deficiency anemia is 
the most prevalent form of anemia in pregnant women 
worldwide, primarily due to increased iron demands 
during pregnancy, combined with insufficient dietary 
intake or poor absorption of iron. In contrast, 
thalassemia trait, which is an inherited blood disorder, 
is commonly found in populations with a high 
prevalence of consanguinity or certain genetic 
backgrounds, particularly in Mediterranean, Middle 
Eastern, and Asian populations. Both IDA and TT share 
similar hematological features, such as low mean 
corpuscular volume (MCV) and low hemoglobin levels, 

which makes differentiating between these two 
conditions challenging. Proper diagnosis is crucial, as 
the treatment for IDA typically involves iron 
supplementation, while TT requires a different 
approach that may include avoiding iron 
supplementation and offering genetic counseling.3-4 

The Mentzer Index (MI) is a diagnostic tool developed to 
help differentiate between IDA and TT. This index is 
calculated by dividing the MCV by the red blood cell 
(RBC) count, yielding a value that can guide clinicians in 
distinguishing between the two conditions. A Mentzer 
Index greater than 13 typically suggests IDA, while 
values less than 13 are more likely to indicate 
thalassemia trait. The simplicity and accessibility of this 
tool make it an attractive first-line diagnostic method, 
particularly in settings with limited resources. However, 
while the MI offers a quick and cost-effective approach, 
it is not without its limitations and challenges, which 
can affect its diagnostic accuracy and clinical utility.5-6 

One of the main challenges in using the Mentzer Index is 
that it does not account for other causes of microcytic 
anemia, such as anemia of chronic disease or 
sideroblastic anemia, which can present similarly to IDA 
or TT. Furthermore, in pregnant women, anemia can 
often be multifactorial, with the presence of both iron 
deficiency and thalassemia trait, making the Mentzer 
Index less reliable in such cases. Additionally, laboratory 

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Emmanuel Ifeanyi Obeagu                                                                                                      Asian Journal of Dental and Health Sciences. 2025; 5(1):11-14 

[12]                                                                                                                                                                                                                                              AJDHS.COM 

variability, such as differences in how MCV or RBC count 
is measured, can lead to discrepancies in the calculation 
of the MI, potentially leading to misdiagnosis. As such, 
the MI should be seen as part of a broader diagnostic 
toolkit, rather than a definitive diagnostic measure.7-8 In 
addition to the Mentzer Index, other diagnostic methods 
are often required to accurately differentiate between 
IDA and TT, especially in complex cases. Tests such as 
serum ferritin, transferrin saturation, and total iron-
binding capacity (TIBC) can provide valuable 
information about iron status, helping to confirm or rule 
out iron deficiency. Hemoglobin electrophoresis is the 
gold standard for diagnosing thalassemia and other 
hemoglobinopathies, providing specific information 
about the types of hemoglobin present in the patient. 
Genetic testing may also be necessary to definitively 
diagnose thalassemia and to assess the need for genetic 
counseling.9 This review aims to explore the diagnostic 
challenges of maternal anemia, focusing on the role of 
the Mentzer Index in clinical practice.  

The Mentzer Index: A Diagnostic Tool in 
Maternal Anemia 

The Mentzer Index (MI) is a simple and widely used 
diagnostic tool that helps differentiate between two of 
the most common causes of microcytic anemia in 
pregnancy: iron deficiency anemia (IDA) and 
thalassemia trait (TT). It is calculated by dividing the 
mean corpuscular volume (MCV) by the red blood cell 
(RBC) count, resulting in an index value that can offer 
insight into the underlying cause of anemia. The MI is 
based on the premise that IDA and TT present with 
different patterns of red blood cell morphology. While 
IDA typically leads to a high RBC count with low MCV 
due to iron deficiency, TT usually results in a relatively 
normal RBC count with lower MCV because of defective 
hemoglobin synthesis.10-11 A MI value greater than 13 
generally suggests that the anemia is due to iron 
deficiency, while a value less than 13 is typically 
indicative of thalassemia trait. The simplicity of this 
calculation makes the Mentzer Index an attractive 
option, particularly in settings where access to 
advanced diagnostic tools or resources is limited. It 
provides a quick, inexpensive, and relatively reliable 
method to screen for IDA and TT, facilitating early 
detection and guiding appropriate management 
strategies for pregnant women.12 Despite its advantages, 
the Mentzer Index has several limitations that can affect 
its diagnostic accuracy. For instance, the MI does not 
account for other causes of microcytic anemia, such as 
anemia of chronic disease or sideroblastic anemia, 
which can share similar hematological features with IDA 
and TT. Additionally, in pregnant women, anemia can 
often be multifactorial, involving both iron deficiency 
and thalassemia trait, which may lead to overlapping 
clinical features. As a result, the MI may be less accurate 
in these complex cases and may require confirmation 
through additional diagnostic tests. Furthermore, 
laboratory errors and variations in MCV and RBC count 
measurements can influence the MI calculation, 
potentially leading to misinterpretation and 
inappropriate treatment decisions.13 

In clinical practice, the Mentzer Index is most effective 
when used as an initial screening tool, with follow-up 
confirmatory tests employed as needed to verify the 
diagnosis. In cases where the MI suggests IDA, serum 
ferritin levels, transferrin saturation, and total iron-
binding capacity (TIBC) can help confirm iron 
deficiency. If thalassemia trait is suspected based on a 
low MI, hemoglobin electrophoresis can be used to 
identify abnormal hemoglobin patterns, providing a 
definitive diagnosis. Genetic testing may also be useful 
for further confirmation, especially in populations at 
high risk for thalassemia.14 While the Mentzer Index is a 
valuable diagnostic tool in identifying the cause of 
microcytic anemia, it should not be used in isolation. 
Clinicians should consider the patient's clinical history, 
other hematological indices, and additional laboratory 
tests to ensure an accurate diagnosis. By combining the 
MI with other diagnostic methods, healthcare providers 
can improve their ability to differentiate between iron 
deficiency anemia and thalassemia trait, allowing for 
more tailored and effective treatment approaches for 
pregnant women. Ultimately, accurate diagnosis and 
management of maternal anemia are critical for 
reducing maternal and fetal morbidity and mortality, 
highlighting the importance of utilizing the Mentzer 
Index as part of a comprehensive diagnostic 
approach.15-16 

Diagnostic Challenges in Maternal Anemia 

Maternal anemia is a common and significant health 
concern during pregnancy, affecting millions of women 
worldwide. The condition is often linked to adverse 
maternal and fetal outcomes, including preterm birth, 
low birth weight, and maternal fatigue. Identifying the 
precise cause of anemia is essential for appropriate 
treatment and prevention of complications. However, 
diagnosing anemia in pregnancy presents unique 
challenges, as it can result from various underlying 
conditions, including nutritional deficiencies, chronic 
diseases, and inherited blood disorders. The two most 
common causes of microcytic anemia during pregnancy 
are iron deficiency anemia (IDA) and thalassemia trait 
(TT), both of which share overlapping hematological 
features, making accurate diagnosis challenging.17-18 One 
of the primary diagnostic challenges in maternal anemia 
is distinguishing between IDA and thalassemia trait. 
Both conditions present with low mean corpuscular 
volume (MCV) and low hemoglobin levels, making it 
difficult to differentiate them based on basic laboratory 
findings alone. While IDA is typically characterized by 
low iron stores and a reduced ability to produce 
hemoglobin, thalassemia trait involves a genetic defect 
that impairs hemoglobin production without necessarily 
affecting iron status. Given the shared clinical features, 
misdiagnosis can occur if the underlying cause is not 
properly identified. In some cases, women may have 
both conditions simultaneously, further complicating 
diagnosis and treatment.19 

Another challenge is the multifactorial nature of anemia 
in pregnancy. Pregnant women are at risk for several 
types of anemia, and a single diagnostic test may not 
always provide sufficient information to determine the 



Emmanuel Ifeanyi Obeagu                                                                                                      Asian Journal of Dental and Health Sciences. 2025; 5(1):11-14 

[13]                                                                                                                                                                                                                                              AJDHS.COM 

exact cause. For example, some women may experience 
anemia due to iron deficiency, while others may have 
anemia due to folate deficiency, vitamin B12 deficiency, 
or anemia of chronic disease. Additionally, pregnancy-
induced changes, such as increased blood volume and 
altered iron metabolism, can further complicate the 
interpretation of standard laboratory tests. The 
complexity of these overlapping factors requires a 
thorough clinical evaluation, including a detailed patient 
history, physical examination, and a variety of 
diagnostic tests.20 Diagnostic tools such as the Mentzer 
Index have been proposed to help differentiate between 
IDA and TT, but they are not foolproof. The Mentzer 
Index, which is calculated by dividing the mean 
corpuscular volume (MCV) by the red blood cell count, 
can suggest whether the anemia is likely due to IDA or 
thalassemia. However, this index has its limitations and 
may not always provide a definitive diagnosis. Factors 
such as laboratory errors, coexisting conditions, or the 
presence of mixed anemia can lead to inaccurate results. 
Additionally, other hematological disorders, such as 
anemia of chronic disease, can present similarly to IDA 
and TT, further complicating the diagnostic process.21 In 
addition to the Mentzer Index, clinicians may rely on 
other diagnostic tests, including serum ferritin, 
transferrin saturation, total iron-binding capacity 
(TIBC), and hemoglobin electrophoresis, to confirm the 
diagnosis. While serum ferritin and transferrin 
saturation are useful for identifying iron deficiency, 
hemoglobin electrophoresis is necessary for confirming 
the presence of thalassemia trait or other 
hemoglobinopathies. In some cases, genetic testing may 
be required to definitively diagnose thalassemia and 
assess the need for genetic counseling, particularly in 
populations with a high prevalence of inherited blood 
disorders.22 

The Role of Complementary Diagnostic 
Methods 

The diagnosis of maternal anemia, particularly 
distinguishing between iron deficiency anemia (IDA) 
and thalassemia trait (TT), can be complex due to the 
overlap in clinical presentation and laboratory findings. 
While tools like the Mentzer Index provide a useful 
starting point, they are not always sufficient in isolation, 
especially when anemia is multifactorial or when 
coexisting conditions complicate the picture. To achieve 
an accurate diagnosis and guide appropriate treatment, 
it is essential to use a combination of diagnostic 
methods that complement each other. These methods 
not only help refine the initial clinical suspicion but also 
assist in confirming the underlying cause of anemia, 
thereby optimizing maternal and fetal health 
outcomes.23 One of the most commonly used 
complementary diagnostic tests is the serum ferritin 
level, which reflects the body’s iron stores. In cases of 
IDA, serum ferritin levels are typically low, while in 
thalassemia trait, ferritin levels are generally normal or 
only mildly reduced. Another important test is the 
transferrin saturation (TS), which can help assess the 
iron status more directly. Low transferrin saturation 
levels are indicative of iron deficiency, while normal or 
elevated levels are more consistent with thalassemia 

trait. Total iron-binding capacity (TIBC) is also useful for 
evaluating iron deficiency, as elevated TIBC is a 
hallmark of IDA, while it tends to remain normal in 
thalassemia trait. These tests, when used in conjunction, 
provide a clearer picture of the patient’s iron status and 
help differentiate between IDA and thalassemia trait.24 

Hemoglobin electrophoresis plays a crucial role in 
diagnosing thalassemia and other hemoglobinopathies. 
This test allows for the separation of different types of 
hemoglobin, enabling the detection of abnormal 
hemoglobin patterns that are characteristic of 
thalassemia, sickle cell disease, and other inherited 
blood disorders. In women suspected of having 
thalassemia trait, hemoglobin electrophoresis can 
confirm the presence of abnormal hemoglobin types, 
such as HbA2, which is elevated in thalassemia. This 
method is particularly important in populations where 
thalassemia is prevalent, as it provides definitive 
confirmation of the diagnosis and guides further 
management, including genetic counseling.25 In addition 
to these tests, genetic testing is becoming increasingly 
important, particularly in high-risk populations or cases 
where the diagnosis remains unclear. Genetic testing 
can identify mutations associated with thalassemia and 
other hemoglobinopathies, providing a definitive 
diagnosis. It is particularly useful in identifying carriers 
of the disease and assessing the risk of passing on 
genetic conditions to offspring. Moreover, genetic 
testing can be helpful when there is a possibility of 
coexisting conditions, such as thalassemia trait 
combined with other inherited disorders, which might 
complicate the clinical picture.26 Furthermore, in cases 
where anemia is multifactorial, as is often the case in 
pregnancy, it is important to consider other potential 
causes. For example, anemia of chronic disease (ACD), 
which often occurs in the context of infection, 
inflammation, or chronic illness, can present similarly to 
IDA and thalassemia. In these cases, complementary 
tests such as C-reactive protein (CRP) or erythrocyte 
sedimentation rate (ESR) may help identify underlying 
inflammatory or infectious conditions. Additionally, 
vitamin B12 and folate levels should be measured if 
there is suspicion of deficiencies in these nutrients, 
which can also contribute to anemia during 
pregnancy.27 

Conclusion 

The diagnosis of maternal anemia remains a critical 
aspect of prenatal care, as it significantly impacts both 
maternal and fetal health outcomes. Given the 
complexities and overlapping features of different types 
of anemia, such as iron deficiency anemia (IDA) and 
thalassemia trait (TT), relying solely on a single 
diagnostic method can lead to misdiagnosis and 
inappropriate treatment. The Mentzer Index serves as a 
useful initial screening tool, but its limitations highlight 
the importance of employing complementary diagnostic 
methods to achieve an accurate diagnosis. Tests such as 
serum ferritin, transferrin saturation, hemoglobin 
electrophoresis, and genetic testing all provide valuable 
insights into the underlying cause of anemia.  



Emmanuel Ifeanyi Obeagu                                                                                                      Asian Journal of Dental and Health Sciences. 2025; 5(1):11-14 

[14]                                                                                                                                                                                                                                              AJDHS.COM 

Conflict of Interest: Author declares no potential 

conflict of interest with respect to the contents, 

authorship, and/or publication of this article. 

Source of Support: Nil 

Funding: The authors declared that this study has 

received no financial support. 

Informed Consent Statement: Not applicable.  

Data Availability Statement: The data supporting in 

this paper are available in the cited references.  

Ethics approval: Not applicable. 

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