Hematology

Recognizing Symptoms and Knowing When to Act

At a Glance

Congenital dyserythropoietic anemia type IV can cause anemia, jaundice, fatigue, pale skin, and an enlarged spleen or liver. Newborns with worsening jaundice, poor feeding, or difficulty waking, and anyone with a sudden severe change from baseline, need prompt medical assessment.

While every individual with Congenital Dyserythropoietic Anemia Type IV (CDA IV) follows a unique path, there are symptoms that can appear at different stages of life. Recognizing these signs helps you partner with your medical team to provide the best care.

Before and At Birth: Early Signs

Because CDA IV involves a gene (KLF1) that helps regulate early development, symptoms can sometimes be detected even before a child is born ^[1].

Prenatal Signs: In some cases, doctors may identify fetal anemia (low red blood cells in the womb) ^[2]. This can lead to cardiomegaly (an enlarged heart) or hydrops fetalis, which is a serious accumulation of fluid in the baby’s tissues ^[3]^[4].
Neonatal Signs: Immediately after birth, infants with CDA IV may show signs of severe jaundice (hyperbilirubinemia), a yellowing of the skin and eyes caused by the rapid breakdown of red blood cells ^[5]^[6]. Infants may also be unusually sleepy, have difficulty feeding, or look very pale due to a lack of oxygen-carrying blood ^[7]^[8].

Bilirubin Concerns in Infants: In newborns, extreme jaundice can lead to neurologic issues ^[6]. Do not wait for a specific bilirubin number or late neurologic signs (like a high-pitched cry or arching back ^[9]) before seeking care. If a newborn has worsening jaundice, poor feeding, or is difficult to wake, obtain prompt clinical assessment. Treatment thresholds depend on the baby’s exact age in hours and other risk factors.

Living with Chronic Anemia

As a person grows, the symptoms of CDA IV often settle into a more chronic pattern. Because the body is constantly working harder to produce and replace red blood cells, they may experience:

Persistent Fatigue: Tiring more easily than peers or having less stamina ^[10].
Physical Findings: A persistent yellowish tint to the eyes or skin (jaundice) or a pale appearance to the lips and nail beds ^[10]^[11].
Organ Changes: Some develop splenomegaly (an enlarged spleen) or hepatomegaly (an enlarged liver) as these organs work overtime to filter out damaged blood cells ^[6]^[5]. Do not attempt to repeatedly press on or evaluate spleen size at home. This should be assessed by the clinical team using examination or ultrasound. Families should discuss individualized activity restrictions (such as contact sports) and have an action plan for any sudden abdominal pain or injury.

Differences in Sex Development

In a very small number of reported cases involving the specific E325K mutation, individuals with 46,XY chromosomes have been noted to have differences in sex development (DSD) ^[12]. This is not present in everyone with CDA IV, but it is a known association that a medical team can evaluate sensitively.

Emergency “Red Flags” and When to Act

Living with CDA IV usually means managing stable, chronic anemia. However, you must seek urgent medical care if you notice an acute change from the established baseline. Contact your hematology team or go to the emergency room immediately for:

Acute Worsening of Anemia or Hemolysis: Seek help for severe breathing difficulty, fainting, or extreme weakness (which in some anemias can relate to an aplastic crisis ^[13]^[14]). Also seek help for sudden abdominal pain (which could represent splenic sequestration, a known risk in some anemias ^[15]^[16]^[13]), chest pain, or rapidly worsening jaundice and dark urine ^[17]^[18]^[19].
Transfusion Reactions: If receiving a blood transfusion, immediately report fever, chills, hives, new breathing difficulty, chest/back pain, or dark urine during or shortly after the transfusion.
Central Line Infections: If you have a port or central line, any redness, drainage, swelling, or pain around the site requires urgent evaluation.
Fever with Asplenia: If the spleen has been surgically removed (splenectomy), the body is at a high risk for life-threatening infections. Any fever in a patient without a functioning spleen is a medical emergency requiring immediate antibiotics according to your hematologist’s specific protocol ^[20]. (Note: Having an enlarged spleen is not the same as having no spleen. Follow your team’s specific fever guidelines for your situation.)

Common questions in this guide

What are the first signs of CDA IV in a newborn?

A newborn may have severe jaundice, unusual sleepiness, poor feeding, or pale skin. Before birth, doctors may find anemia, an enlarged heart, or fluid buildup in the body. Worsening jaundice, poor feeding, or difficulty waking needs prompt clinical assessment.

What symptoms can CDA IV cause over time?

Ongoing CDA IV anemia may cause low energy, pale skin or lips, and yellowing of the eyes or skin. Some people develop an enlarged spleen or liver. The clinical team should monitor these findings rather than families repeatedly checking the spleen at home.

When should someone with CDA IV go to the emergency room?

Get urgent medical care for severe breathing difficulty, fainting, extreme weakness, chest pain, sudden abdominal pain, rapidly worsening jaundice, or dark urine. These symptoms can signal a serious change from the person’s usual anemia or increased red blood cell breakdown and should not be watched at home.

How urgent is jaundice in a newborn with CDA IV?

Do not wait for a particular bilirubin number or for late neurologic signs before seeking help. Worsening jaundice, poor feeding, or difficulty waking needs prompt clinical assessment, and treatment thresholds depend on the baby’s age in hours and other risk factors.

How do I recognize a blood transfusion reaction?

Report fever, chills, hives, new breathing difficulty, chest or back pain, or dark urine during or soon after a transfusion. These symptoms require immediate attention from the transfusion team or emergency services.

What does fever mean after a splenectomy in CDA IV?

Any fever in a person without a functioning spleen is a medical emergency because serious infections can progress quickly. Follow the hematologist’s written plan and seek immediate care for antibiotics. An enlarged spleen is different from having no functioning spleen, so follow the guidance for the individual’s situation.

Can the E325K mutation be linked to differences in sex development?

A small number of reported people with 46,XY chromosomes and the E325K mutation had differences in sex development. This does not occur in everyone with CDA IV. The medical team, including a pediatric endocrinologist when appropriate, can provide sensitive evaluation.

Get notified when new evidence is published on Congenital dyserythropoietic anemia type IV.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

References (20)

1
A Krüppel-like factor 1 (KLF1) Mutation Associated with Severe Congenital Dyserythropoietic Anemia Alters Its DNA-Binding Specificity.
Kulczynska K, Bieker JJ, Siatecka M
Molecular and cellular biology 2020; (40(5)) doi:10.1128/MCB.00444-19.
PMID: 31818881
2
KLF1 E325K-associated Congenital Dyserythropoietic Anemia Type IV: Insights Into the Variable Clinical Severity.
Ravindranath Y, Johnson RM, Goyette G, et al.
Journal of pediatric hematology/oncology 2018; (40(6)):e405-e409 doi:10.1097/MPH.0000000000001056.
PMID: 29300242
3
An Unusual Hydrops Fetalis Associated with Compound Heterozygosity for Krüppel-like Factor 1 mutations.
Lee HH, Mak AS, Kou KO, et al.
Hemoglobin 2016; (40(6)):431-434 doi:10.1080/03630269.2016.1267017.
PMID: 28361594
4
A family affair-Severe fetal and neonatal hemolytic anemia due to novel alpha-spectrin mutations in two siblings.
Donepudi R, Westerfield L, Stonecipher A, et al.
American journal of medical genetics. Part A 2020; (182(3)):561-564 doi:10.1002/ajmg.a.61455.
PMID: 31854503
5
KLF1 mutation-associated congenital dyserythropoietic anemia type IV: a case report and literature review.
Lu K, He Y, Nong S, et al.
Frontiers in pediatrics 2026; (14()):1854766 doi:10.3389/fped.2026.1854766.
PMID: 42597595
6
KLF1-null neonates display hydrops fetalis and a deranged erythroid transcriptome.
Magor GW, Tallack MR, Gillinder KR, et al.
Blood 2015; (125(15)):2405-17 doi:10.1182/blood-2014-08-590968.
PMID: 25724378
7
Congenital dyserythropoietic anemia type IV in the genetic era: A rare neonatal case report of rapid identification with a review of the literature.
Deguise MO, Blain S, Simpson E, et al.
Pediatric blood & cancer 2023; (70(5)):e30245 doi:10.1002/pbc.30245.
PMID: 36798023
8
[Hereditary hemolytic anemia in newborns: clinical significance of genetic diagnosis].
Ohga S, Ishimura M, Eguchi K, et al.
[Rinsho ketsueki] The Japanese journal of clinical hematology 2020; (61(5)):484-490 doi:10.11406/rinketsu.61.484.
PMID: 32507813
9
A pediatrician's practical guide to diagnosing and treating hereditary spherocytosis in neonates.
Christensen RD, Yaish HM, Gallagher PG
Pediatrics 2015; (135(6)):1107-14 doi:10.1542/peds.2014-3516.
PMID: 26009624
10
Hemoglobin switching in mice carrying the Klf1 variant.
Korporaal A, Gillemans N, Heshusius S, et al.
Haematologica 2021; (106(2)):464-473 doi:10.3324/haematol.2019.239830.
PMID: 32467144
11
Severe Presentation of Congenital Hemolytic Anemias in the Neonatal Age: Diagnostic and Therapeutic Issues.
Cortesi V, Manzoni F, Raffaeli G, et al.
Diagnostics (Basel, Switzerland) 2021; (11(9)) doi:10.3390/diagnostics11091549.
PMID: 34573891
12
Interplay between fibroblast growth factor 9 (FGF9) and CD44 underlies 46,XY disorders of sex development in Kruppel-like factor 1 (KLF-1)-E325K-associated congenital dyserythropoietic anaemia (CDA-IV).
Ravindranath Y, Craig DB, Parajuli P, et al.
British journal of haematology 2026; (209(4)):1574-1585 doi:10.1111/bjh.70760.
PMID: 42753106
13
Parvovirus b19 infection in children with sickle cell disease, watch out for splenomegaly! A case report.
de la Hoz JA, Otones LL, Sáenz MH, Martín MJR
African health sciences 2022; (22(1)):598-601 doi:10.4314/ahs.v22i1.69.
PMID: 36032454
14
Human Parvovirus B19 in Children with Sickle Cell Disease; Poking the Spleen.
Saad AA, Beshlawi I, Al-Rawas AH, et al.
Oman medical journal 2017; (32(5)):425-428 doi:10.5001/omj.2017.79.
PMID: 29026475
15
[Acute splenic sequestration in children with sickle cell disease--an overview].
Larsson F, Åhlin A, Marshall Heyman M, Abrahamsson J
Lakartidningen 2016; (113()).
PMID: 28026839
16
Acute splenic sequestration in HbSS: observations from the Jamaican birth cohort.
Serjeant G, Mason K, Hambleton I, Serjeant B
Archives of disease in childhood 2024; (109(2)):100-105 doi:10.1136/archdischild-2023-326173.
PMID: 37918896
17
A Differential Approach to an Uncommon Case of Acute Anemia in a Child With Sickle Cell Disease.
Srinivasan A, Gourishankar A
Global pediatric health 2019; (6()):2333794X19848674 doi:10.1177/2333794X19848674.
PMID: 31106251
18
[Congenital hemolytic anemias due to erythrocyte membrane and enzyme defects].
Génevaux F, Bertsch A, Wiederer L, Eber S
Deutsche medizinische Wochenschrift (1946) 2022; (147(19)):1266-1276 doi:10.1055/a-1767-8423.
PMID: 36126925
19
Ceftriaxone-induced drug reaction mimicking acute splenic sequestration crisis in a child with hemoglobin SC disease.
Van Buren NL, Gorlin JB, Reed RC, et al.
Transfusion 2018; (58(4)):879-883 doi:10.1111/trf.14536.
PMID: 29473172
20
Recommendations regarding splenectomy in hereditary hemolytic anemias.
Iolascon A, Andolfo I, Barcellini W, et al.
Haematologica 2017; (102(8)):1304-1313 doi:10.3324/haematol.2016.161166.
PMID: 28550188

This page about CDA IV symptoms and emergency warning signs is for informational purposes only and does not constitute medical advice. Follow your hematology team’s individualized plan and seek urgent care for a newborn or patient with concerning changes.