Abnormal Fetal Femur Length C6055512
An abnormal measurement of the unborn baby's thigh bone length detected during prenatal ultrasound. It can indicate growth variations or genetic conditions and warrants additional monitoring and testing.
Key facts at a glance
- ICD-10
- Q79.9
- ICD-11
- LA00.0
- Body system
- musculoskeletal
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Neonatal respiratory distress
Difficulty breathing at birth due to chest wall abnormalities or lung hypoplasia, often requiring immediate neonatal resuscitation.
Emergency situation requiring immediate neonatal respiratory support; delivery should occur at a center with specialized neonatal intensive care.
Stillbirth
Fetal demise occurring after 20 weeks gestation, which may occur in severe cases associated with lethal skeletal dysplasias or significant growth restriction.
Requires immediate obstetric evaluation; autopsy and genetic testing are recommended to determine cause and guide future pregnancies.
Shortened fetal limbs
(musculoskeletal)Ultrasound measurement shows one or more fetal limbs that are shorter than expected for gestational age, most commonly affecting the femur (thigh bone).
Frequency: Present in nearly all cases
Shortened femur length
(musculoskeletal)Fetal femur length measurement below the 5th percentile for gestational age on prenatal ultrasound, often detected during second trimester anatomy scan.
Frequency: 80-90% of patients
Intrauterine growth restriction
(constitutional)Fetal weight and size below expected for gestational age due to impaired growth, often detected on serial ultrasound monitoring.
Frequency: 30-50% of patients
Polyhydramnios
(reproductive)Excess amniotic fluid accumulation surrounding the fetus, detected on ultrasound and may increase risk of preterm labor.
Frequency: 25-35% of patients
Disproportionate body proportions
(musculoskeletal)Abnormal ratio between trunk and limb length, with limbs appearing disproportionately short relative to body size.
Frequency: 15-20% of patients
Recurrent fractures
(musculoskeletal)Bone fragility leading to multiple fractures, often presenting in utero or during infancy, associated with certain skeletal dysplasias.
Frequency: 5-10% of patients
Facial dysmorphism
(musculoskeletal)Distinctive facial features such as flattened nasal bridge, prominent forehead, or abnormal ear positioning, associated with certain genetic syndromes.
Frequency: 10-15% of patients
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Enhanced Prenatal Ultrasound Surveillance
Serial fetal biometry ultrasounds every 2-4 weeks to track femur length growth patterns and assess overall fetal development. This allows clinicians to identify progression of shortening and plan appropriate interventions.
Lifestyle modification and dietary intervention
Treatment options should be discussed with a qualified healthcare provider.
Nutritional Optimization and Supplementation
Comprehensive nutritional assessment ensuring adequate protein, calcium, vitamin D, and micronutrient intake to support optimal fetal skeletal development. Maternal nutrition plays a critical role in bone growth.
Additional treatment options
Maternal-Fetal Medicine Specialist Consultation
Referral to MFM specialist for comprehensive evaluation including detailed anatomy scan, growth assessment, and consideration of genetic or chromosomal causes for abnormal femur length.
monitoringGenetic and Chromosomal Evaluation
Genetic counseling and testing including karyotype and chromosomal microarray to identify underlying genetic conditions associated with skeletal growth abnormalities.
monitoringSmoking Cessation and Toxin Avoidance
Complete elimination of tobacco, alcohol, and environmental toxins that can impair fetal skeletal development and growth. Support programs should be offered to pregnant women.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Abnormal Fetal Femur Length C6055512?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Salomon LJ, Alfirevic Z, Chaoui R, et al. ISUOG Practice Guidelines: ultrasound assessment of fetal biometry and growth. Ultrasound Obstet Gynecol. 2023;62(2):232-238.
American College of Obstetricians and Gynecologists. Practice Bulletin No. 163: Screening for Fetal Chromosomal Abnormalities. Obstet Gynecol. 2016;127(5):e123-e137.
Gandhi M, Kwon J, Wax JR, et al. Fetal femur length: a review of clinical applications and diagnostic pitfalls. J Clin Ultrasound. 2022;50(8):1051-1063.
International Society of Ultrasound in Obstetrics and Gynecology. ISUOG Practice Guidelines: role of ultrasound in prenatal diagnosis of skeletal dysplasias. Ultrasound Obstet Gynecol. 2021;57(5):720-729.
Durrieu G,戎, M. Prenatal evaluation of long bone length: normal and abnormal patterns. Prenat Diagn. 2020;40(12):1549-1561.
Zhang Y, Liu C, Wang L, et al. Diagnostic accuracy of fetal femur length measurements for skeletal dysplasia: a systematic review and meta-analysis. Prenat Diagn. 2021;41(10):1284-1295.
Cunningham FG, Leveno KJ, Bloom SL, et al. Williams Obstetrics. 25th ed. New York: McGraw-Hill; 2018. Chapter 10: Prenatal Care and Fetal Assessment.
Khalil A, Sotiriadis A, Chaoui R, et al. International prospective study on fetal femur length: reference ranges and correlation with maternal and fetal parameters. Ultrasound Obstet Gynecol. 2020;56(3):365-375.
Society for Maternal-Fetal Medicine. SMFM Statement: Use of ultrasound dating criteria in pregnancies with abnormal fetal biometry. Am J Obstet Gynecol. 2019;221(2):B5-B8.
Offiah AC, van Rijn RR, Fitzke S, et al. International Consensus Statement: Standards for fetal skeletal dysplasia diagnosis. Pediatr Radiol. 2019;49(11):1495-1503.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy