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Summary Table

Category	Details
Risk Factors	Multigravida, short interpregnancy interval, adolescent pregnancy, poor dietary intake (low iron, folate, B12), helminth infection (hookworm), malaria-endemic regions, thalassemia trait, heavy menstrual history before pregnancy
Etiology	Most commonly iron deficiency anemia (IDA); also folate deficiency, B12 deficiency, chronic infection (TB, malaria, helminthiasis), thalassemia, and physiologic hemodilution of pregnancy
Patient Presentation	Fatigue, weakness, pallor, dyspnea on exertion, dizziness, palpitations; often asymptomatic in mild cases (the "5L" mnemonic from Indonesian practice: Lesu, Letih, Lemah, Lelah, Lalai)
Classic Physical Exam	Conjunctival pallor, pale nail beds, tachycardia, koilonychia (spoon nails) in severe IDA, glossitis, angular cheilitis; in severe anemia: flow murmur, signs of high-output cardiac failure
Key Diagnostic Results	Hb < 11 g/dL (WHO/Kemenkes threshold for pregnant women); low MCV and MCH in IDA; low serum ferritin (most useful single test for iron stores); elevated TIBC; peripheral smear showing microcytic hypochromic red cells
Management	Iron supplementation: 60 mg elemental iron + 400 mcg folic acid daily throughout pregnancy (Kemenkes standard TTD); dietary counseling emphasizing heme-iron sources and vitamin C; treat underlying infections; parenteral iron or transfusion for severe/refractory cases
Keywords	"Hb < 11 g/dL in pregnancy," "microcytic hypochromic," "iron deficiency," "TTD" (Tablet Tambah Darah), "blanket approach," "pallor + fatigue + pregnant," "koilonychia," "pica/pagophagia"

1. Pathophysiology

Pregnancy induces a state of physiologic hemodilution. Plasma volume expands by approximately 40 to 50 percent, while red blood cell mass increases by only about 20 to 30 percent. This disproportionate expansion causes a relative drop in hemoglobin concentration, even in well-nourished women. The nadir of this physiologic dilution typically occurs around 28 to 34 weeks of gestation. This is why a mildly low Hb in the second trimester does not always indicate pathology, but values falling below 11 g/dL at any point during pregnancy are classified as anemia per WHO and Kemenkes criteria.

Buku Saku Pencegahan Anemia Kemenkes 2023 notes that during pregnancy, the body undergoes enlargement of several organs including the breasts, uterus, and placenta, along with an increase in total blood volume. Combined with fetal growth that accelerates over time, these changes markedly increase the demand for iron, folate, and other nutrients. If dietary intake cannot keep pace, the mother develops a true nutrient-deficit anemia on top of the physiologic dilution.

Iron deficiency is by far the most common cause, accounting for roughly 50 percent of anemia in pregnancy globally and an even higher proportion in developing countries. Iron is needed to synthesize hemoglobin, and during pregnancy the total iron requirement rises to approximately 1,000 mg over the entire gestational period (300 mg for the fetus and placenta, 500 mg for the expanded maternal red cell mass, and 200 mg for basal losses). Because most women begin pregnancy with suboptimal iron stores, supplementation is given as a blanket approach without checking anemia status first, as the Buku Saku Pencegahan Anemia Kemenkes 2023 explicitly recommends. The rationale cited is that with a 48.9% prevalence of anemia in Indonesian pregnant women, and an even larger proportion having depleted iron stores without overt anemia, universal supplementation is both safe and cost-effective.

At the cellular level, iron deficiency impairs hemoglobin production in developing erythroblasts, yielding smaller, paler red blood cells (microcytic, hypochromic). With fewer oxygen-carrying molecules per cell, oxygen delivery to tissues falls. The body compensates through increased cardiac output (hence palpitations and tachycardia), redistribution of blood flow (hence pallor in less critical vascular beds), and upregulation of 2,3-DPG to shift the oxygen-hemoglobin dissociation curve rightward. When these compensatory mechanisms are overwhelmed, symptoms of tissue hypoxia emerge: fatigue in muscles, poor concentration in the brain, and dyspnea reflecting increased ventilatory drive.

Buku Saku Pencegahan Anemia Kemenkes 2023 emphasizes that anemia develops gradually, allowing the body to adapt so that symptoms are often not noticed until the condition is already moderate or severe. This insidious onset is the reason screening is built into routine antenatal care rather than relying on symptomatic presentation.

Folate deficiency produces a different picture: impaired DNA synthesis leads to megaloblastic erythropoiesis with large, oval macrocytes and hypersegmented neutrophils. Neural tube defects in the fetus are the feared consequence, which is why folic acid (400 mcg) is combined with iron in the standard TTD formulation.

2. Classification and Clinical Manifestation

By Severity (WHO)

Severity	Hemoglobin Level	Typical Clinical Features
Mild	10 to 10.9 g/dL	Usually asymptomatic or vague fatigue; the "5L" symptoms (Lesu, Letih, Lemah, Lelah, Lalai) may be dismissed as normal pregnancy tiredness
Moderate	7 to 9.9 g/dL	Noticeable pallor, palpitations with ordinary activities, dyspnea on exertion, exercise intolerance
Severe	< 7 g/dL	Pronounced pallor, persistent tachycardia, resting dyspnea, chest pain, signs of high-output heart failure, risk of hemodynamic instability during delivery

By Morphology (MCV-Based)

Morphologic Type	MCV Range	Common Causes in Pregnancy
Microcytic (MCV < 80 fL)	Low	Iron deficiency (most common), thalassemia trait, anemia of chronic disease (less common in pregnancy)
Normocytic (MCV 80 to 100 fL)	Normal	Acute blood loss, physiologic hemodilution, anemia of chronic disease, early iron deficiency, mixed deficiency
Macrocytic (MCV > 100 fL)	High	Folate deficiency, B12 deficiency, hypothyroidism, medications (e.g., anticonvulsants)

Maternal and Fetal Complications

Affected Party	Complication
Mother	Increased risk of hemorrhagic complications and maternal mortality; decreased immune function leading to susceptibility to infection; miscarriage/abortion
Fetus/Neonate	Preterm birth (< 37 weeks); low birth weight / BBLR (< 2500 g); short birth length / PBLR (< 48 cm); neonatal anemia with low iron stores manifesting from age 6 months; stillbirth risk in severe maternal anemia
Long-term offspring	Increased risk of stunting (within the 1000 HPK window), reduced cognitive development, and intergenerational cycle of non-communicable diseases (hypertension, diabetes, cardiovascular disease)

3. Diagnostic Workup

Test	Role	Key Findings in IDA
Complete Blood Count (CBC)	Best initial test	Hb < 11 g/dL, low MCV (< 80 fL), low MCH, elevated RDW
Peripheral Blood Smear	Morphologic confirmation	Microcytic hypochromic RBCs, pencil cells (elliptocytes), occasional target cells
Serum Ferritin	Most useful single marker for iron stores	< 30 ng/mL confirms depleted stores (< 15 ng/mL is definitive); note that ferritin is an acute phase reactant and can be falsely normal in concurrent infection
Serum Iron / TIBC / Transferrin Saturation	Supportive	Low serum iron, elevated TIBC, transferrin saturation < 16%
Reticulocyte Count	Assess marrow response	Low or inappropriately normal in IDA; rises after iron supplementation (reticulocyte response expected within 5 to 7 days)
Hemoglobin Electrophoresis	Rule out thalassemia	Elevated HbA2 in beta-thalassemia trait; essential when microcytosis persists despite iron supplementation
Stool Examination	Rule out helminthiasis	Ova and parasites; Buku Saku Pencegahan Anemia Kemenkes 2023 highlights hookworm as a cause of chronic GI blood loss contributing to anemia

Buku Saku Pencegahan Anemia Kemenkes 2023 stipulates that hemoglobin should be checked at least twice during pregnancy: once in the first trimester and once in the third trimester, integrated into standard ANC visits. This dual-timepoint strategy captures women who enter pregnancy already anemic as well as those who develop anemia as fetal demands peak in the third trimester.

The best initial test is a CBC. In a licensing exam vignette, you will be given a pregnant woman with fatigue and pallor, and the first thing to confirm is the hemoglobin level. A value below 11 g/dL establishes the diagnosis of anemia in pregnancy.

Once anemia is identified, the next step is to characterize it by MCV. A low MCV points toward iron deficiency or thalassemia trait. To distinguish between these two, order a serum ferritin: if ferritin is low, the diagnosis is iron deficiency. If ferritin is normal or high despite a low MCV, consider thalassemia and order hemoglobin electrophoresis. A practical discriminator often tested: in iron deficiency the RDW is elevated (anisocytosis) whereas in thalassemia trait the RDW is typically normal.

If the MCV is high (macrocytic), check folate and B12 levels. The peripheral smear showing hypersegmented neutrophils (five or more lobes) is the classic finding of megaloblastic anemia.

Buku Saku Pencegahan Anemia Kemenkes 2023 adopts a blanket supplementation policy and does not mandate Hb testing before starting TTD, because prevalence is high enough that the population-level benefit outweighs the cost of universal screening. However, for clinical management and exam purposes, Hb measurement remains the cornerstone of diagnosis and monitoring.

4. Management and Treatment

Setting	Intervention	Details
Prevention (all pregnant women)	Oral iron + folic acid (TTD)	60 mg elemental iron + 400 mcg folic acid, 1 tablet daily throughout pregnancy (Kemenkes blanket approach)
Prevention (adolescent girls)	Weekly TTD	1 tablet per week year-round, given through the school-based Aksi Bergizi program
Mild to moderate IDA	Therapeutic oral iron	Increase to 120 mg elemental iron daily in divided doses + continued folic acid; reassess Hb in 4 weeks
Severe anemia (Hb < 7 g/dL) or intolerance	IV iron (ferric carboxymaltose or iron sucrose)	When oral iron fails, is not tolerated, or rapid correction is needed (e.g., third trimester with upcoming delivery)
Life-threatening / hemorrhagic	Packed RBC transfusion	Indicated for hemodynamic instability, Hb < 5 g/dL, or active hemorrhage
Adjunctive dietary counseling	Balanced nutrition rich in heme iron	Heme-iron sources (liver, shellfish, red meat, fish) and vitamin C-rich foods (citrus, guava, tomato) to enhance non-heme iron absorption; avoid tea, coffee, milk, and calcium supplements within 2 hours of taking TTD (per Kemenkes)
Treat underlying cause	Deworming, antimalarials, TB treatment	Buku Saku Pencegahan Anemia Kemenkes 2023 names kecacingan, malaria, and TB as comorbid infections that must be treated alongside iron supplementation

All pregnant women in Indonesia receive TTD containing 60 mg of elemental iron and 400 mcg folic acid, one tablet daily, starting as early as possible in pregnancy. Buku Saku Pencegahan Anemia Kemenkes 2023 stresses that this is equivalent to 300 mg of ferrous sulfate heptahydrate, or 180 mg of ferrous fumarate, or 500 mg of ferrous gluconate. This distinction matters because many commercial multivitamins list iron in salt weight rather than elemental weight, leading to underdosing. For example, a tablet containing "60 mg ferrous fumarate" provides only about 10 mg of elemental iron, far below the recommended 60 mg.

Patients should be counseled to take TTD after meals (not on an empty stomach) or at bedtime to minimize gastrointestinal side effects such as nausea, epigastric discomfort, constipation, or diarrhea. Buku Saku Pencegahan Anemia Kemenkes 2023 also recommends taking TTD with plain water and consuming vitamin C-rich foods to enhance absorption. Within two hours before or after taking TTD, patients should avoid tea, coffee, milk, calcium tablets, and antacids, all of which impair iron absorption through chelation or mucosal coating.

Black stools are a normal and expected effect of oral iron supplementation and should not be mistaken for melena. Patients should be reassured about this.

If oral iron is not tolerated or if Hb fails to rise by at least 1 g/dL after 4 weeks of adequate oral therapy, consider parenteral iron. IV iron formulations such as ferric carboxymaltose allow large single-dose infusions and are safe in the second and third trimesters. Parenteral iron is also preferred when there is documented malabsorption or when delivery is imminent and time for oral correction is insufficient.

Blood transfusion is reserved for severe symptomatic anemia or hemodynamic compromise. The threshold is generally Hb < 5 g/dL or clinical instability regardless of Hb level.

Buku Saku Pencegahan Anemia Kemenkes 2023 explicitly addresses several myths that can undermine adherence: that TTD is a "medicine" only for sick people (it is also a supplement for prevention), that TTD raises blood pressure (it does not; iron and folic acid do not affect sodium balance), that TTD causes heavier menstruation (menstrual volume is governed by hormones, not iron), and that TTD makes the baby too large (macrosomia is related to gestational diabetes, not iron supplementation).

5. Differential Diagnosis and Distractors

Differential	Why It Looks Similar	Key Discriminator
Physiologic anemia of pregnancy (hemodilution)	Hb drops in mid-pregnancy in all women; fatigue is common	Hb typically stays above 10 g/dL; MCV remains normal; ferritin is normal; no treatment needed beyond routine supplementation
Thalassemia trait (alpha or beta)	Microcytic anemia with low MCV, may coexist with pregnancy	MCV is disproportionately low for the degree of anemia; RDW is normal (uniform microcytosis); ferritin is normal or elevated; Hb electrophoresis shows elevated HbA2 (beta-thal trait) or is normal (alpha-thal trait, requiring genetic testing)
Folate deficiency	Fatigue and pallor in pregnancy, overlapping risk factors (poor diet)	MCV is elevated (macrocytic), not low; hypersegmented neutrophils on smear; low serum folate; associated neural tube defect risk
B12 deficiency	Macrocytic anemia, neurologic symptoms possible	Elevated MCV; low serum B12; neurologic findings (paresthesias, proprioception loss) that do not occur in folate or iron deficiency
Anemia of chronic disease (ACD)	Can present as microcytic or normocytic; common in women with TB or chronic infections	Ferritin is normal or elevated (key distinguisher from IDA); low TIBC (opposite of IDA); low serum iron but for different reasons (iron sequestration, not depletion)
Sickle cell disease	Chronic anemia, fatigue, may worsen during pregnancy	Normocytic; sickle cells and target cells on smear; Hb electrophoresis shows HbS; history of vaso-occlusive crises
Hemorrhagic anemia (placenta previa, abruption)	Acute drop in Hb during pregnancy	Acute onset with vaginal bleeding; normocytic anemia; hemodynamic instability; diagnosis is clinical + ultrasound for placental location

6. Traps and High-Yield Pearls

The most common trap with anemia in pregnancy is confusing physiologic hemodilution with pathologic anemia. A vignette describing a healthy-appearing woman at 28 weeks with an Hb of 10.5 g/dL, normal MCV, and normal ferritin does not require iron therapy beyond routine supplementation. The test-writer is checking whether you know that a modest Hb drop in the second trimester can be physiologic. Conversely, if that same patient has an Hb of 9.5 g/dL with a low MCV and low ferritin, the answer is iron deficiency anemia requiring therapeutic-dose iron.

Another frequent mistake is failing to distinguish iron deficiency from thalassemia trait when both present with microcytosis. The vignette clue is the Mentzer index or, more commonly on exams, the ferritin: low ferritin means iron deficiency, normal or high ferritin with microcytosis means thalassemia. Treating a thalassemia carrier with aggressive iron supplementation is ineffective and can lead to iron overload.

Watch for questions that test timing of supplementation and compliance barriers. Buku Saku Pencegahan Anemia Kemenkes 2023 dedicates an entire section to debunking myths (TTD raises blood pressure, TTD is only needed if you feel sick, TTD causes heavy periods). These appear as patient counseling questions where the correct answer involves reassuring the patient and emphasizing continued use.

Finally, remember the iron absorption interactions. A vignette describing a compliant patient whose Hb fails to improve despite daily iron should prompt you to ask about concurrent intake of tea, coffee, calcium supplements, or antacids, all of which inhibit absorption when taken close to the iron dose. The correct next step is counseling on proper timing (separate by at least 2 hours), not switching to parenteral iron.

The core competency being tested across all anemia-in-pregnancy questions is your ability to integrate epidemiologic context (who is at risk), laboratory interpretation (MCV, ferritin, and smear findings), and stepwise management (prevention, oral therapy, parenteral rescue, transfusion) into a coherent clinical decision.

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