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PubMed This is a summary of 13 peer-reviewed journal articles Updated
Pediatric Endocrinology

Building Your Child's Care Team

At a Glance

Children with hypoinsulinemic hypoglycemia and body hemihypertrophy often need coordinated care from pediatric endocrinology, genetics, nutrition, and—when tumor risk applies—oncology. Bring critical labs, genetic reports, growth records, and glucose logs to specialist visits.

Because your child’s condition is exceptionally rare—for example, impaired insulin signaling causes hypoglycemia in fewer than 1 in 1,000,000 infants [1]—your primary pediatrician remains a key member of care, but specialist coordination is important. This diagnosis sits at the intersection of metabolism, genetics, and oncology. To provide the best care, you need a multidisciplinary team [2][3].

The Core Multidisciplinary Team

Each member of the team plays a specific role.

  • Pediatric Endocrinologist: Look for one with specific experience in Congenital Hyperinsulinism (CHI) or rare hypoglycemia disorders [4][5].
  • Medical Geneticist: Their job is to find the exact variant in the DNA. They are essential for interpreting complex mosaic results [6][7].
  • Pediatric Oncologist: If your child’s specific diagnosis carries a tumor risk, an oncologist is often needed to manage the strict tumor surveillance protocol [8][9].
  • Specialized Dietitian: Managing this condition requires precise “fueling.” A dietitian will calculate the exact carbohydrate needs and help you manage feeds [4][1].

Preparing for the Initial Consultation

When you meet with a specialist for the first time, bringing organized “artifacts” allows the doctor to spend more time on your child.

Essential Records to Bring:

  • The Critical Sample Labs: This is the most vital document. It must include simultaneous levels of glucose, insulin, C-peptide, ketones (beta-hydroxybutyrate), and free fatty acids taken during a “low” [5][4].
  • Genetic Testing Reports: Bring the full laboratory report. The geneticist needs to see the “depth” of the sequencing to know if mosaicism was properly investigated [6].
  • Growth Charts: Serial measurements of height, weight, and head circumference help the team see the “velocity” of your child’s growth [10][11].
  • Glucose Logs and CGM Data: Bring logs showing the exact times of low readings, any symptoms, and how quickly the sugar rose [12].
  • Photographs of Asymmetry: If the hemihypertrophy is visible, photos can be helpful [10].

Coordination: The “Quarterback”

In a complex care team, one doctor should act as the “lead coordinator” or “quarterback.” This is often the endocrinologist or the geneticist [2].

Don’t be afraid to ask, “Who is the main point of contact if I have a question that overlaps two specialties?” Clear communication between these experts is the key to preventing emergencies [3][13].

Common questions in this guide

Which specialists should be on my child's care team?
A pediatric endocrinologist with experience in congenital hyperinsulinism or rare hypoglycemia is usually central. The team may also include a medical geneticist, specialized dietitian, and, when the diagnosis carries tumor risk, a pediatric oncologist.
What records should I bring to my child's first specialist appointment?
Bring the critical sample collected during a low blood sugar episode, including glucose, insulin, C-peptide, ketones, and free fatty acids when available. Also bring the complete genetic report, growth charts, glucose or continuous-monitoring logs, and photographs showing body asymmetry.
Who should coordinate care across all of my child's specialists?
The pediatric endocrinologist or medical geneticist often serves as the lead coordinator. Ask the team to identify one main contact and to give you clear instructions about who to call during a blood sugar emergency.
Does hemihypertrophy mean my child needs tumor screening?
Some diagnoses that cause overgrowth or hemihypertrophy carry tumor risk, but the need for screening and its schedule depend on the child's specific diagnosis. Ask the care team which protocol applies and how results will be coordinated with pediatric oncology.
Should we ask for a second opinion at a hyperinsulinism center?
Because this condition is rare and complex, families can ask whether a regional or national hyperinsulinism center would be appropriate. Your current team can help arrange the referral and share laboratory, genetic, growth, and treatment records.
How should I track my child's low blood sugar episodes?
Record the time, glucose reading, symptoms or behavior, what your child was doing, the treatment given, and how quickly the glucose improved. Bring the log and any continuous glucose monitor data to specialist visits.

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References

References (13)
  1. 1

    Hypoinsulinemic hypoglycemia with hemihypertrophy in a Filipino infant: management in a resource-limited setting.

    Perez EGM, Estrada SC

    JCEM case reports 2026; (4(11)):luag231 doi:10.1210/jcemcr/luag231.

    PMID: 42871118
  2. 2

    A standard of care for individuals with PIK3CA-related disorders: An international expert consensus statement.

    Douzgou S, Rawson M, Baselga E, et al.

    Clinical genetics 2022; (101(1)):32-47 doi:10.1111/cge.14027.

    PMID: 34240408
  3. 3

    Work-Up and Treatment Strategies for Individuals with PIK3CA-Related Disorders: A Consensus of Experts from the Scientific Committee of the Italian Macrodactyly and PROS Association.

    Gazzin A, Leoni C, Viscogliosi G, et al.

    Genes 2023; (14(12)) doi:10.3390/genes14122134.

    PMID: 38136956
  4. 4

    Treatment of hypoglycemia due to a rare pathogenic variant in AKT2 with waxy maize heat-modified starch.

    Parker M, Yau D

    Clinical case reports 2024; (12(2)):e8473 doi:10.1002/ccr3.8473.

    PMID: 38344362
  5. 5

    An expanded clinical spectrum of hypoinsulinaemic hypoketotic hypoglycaemia.

    Welters A, Leiter SM, Bachmann N, et al.

    Orphanet journal of rare diseases 2023; (18(1)):360 doi:10.1186/s13023-023-02954-5.

    PMID: 37974153
  6. 6

    Genotypes and phenotypes heterogeneity in PIK3CA-related overgrowth spectrum and overlapping conditions: 150 novel patients and systematic review of 1007 patients with PIK3CA pathogenetic variants.

    Mussa A, Leoni C, Iacoviello M, et al.

    Journal of medical genetics 2023; (60(2)):163-173 doi:10.1136/jmedgenet-2021-108093.

    PMID: 35256403
  7. 7

    Molecular diagnosis of PIK3CA-related overgrowth spectrum (PROS) in 162 patients and recommendations for genetic testing.

    Kuentz P, St-Onge J, Duffourd Y, et al.

    Genetics in medicine : official journal of the American College of Medical Genetics 2017; (19(9)):989-997 doi:10.1038/gim.2016.220.

    PMID: 28151489
  8. 8

    Custom Pediatric Oncology Next-Generation Sequencing Panel Identifies Somatic Mosaicism in Archival Tissue and Enhances Targeted Clinical Care.

    Quindipan C, Cotter JA, Ji J, et al.

    Pediatric neurology 2021; (114()):55-59 doi:10.1016/j.pediatrneurol.2020.09.015.

    PMID: 33221597
  9. 9

    Hypoglycemia due to PI3K/AKT/mTOR signaling pathway defects: two novel cases and review of the literature.

    Maines E, Franceschi R, Martinelli D, et al.

    Hormones (Athens, Greece) 2021; (20(4)):623-640 doi:10.1007/s42000-021-00287-1.

    PMID: 33876391
  10. 10

    Constitutive Activation of AKT2 in Humans Leads to Hypoglycemia Without Fatty Liver or Metabolic Dyslipidemia.

    Minic M, Rocha N, Harris J, et al.

    The Journal of clinical endocrinology and metabolism 2017; (102(8)):2914-2921 doi:10.1210/jc.2017-00768.

    PMID: 28541532
  11. 11

    Facial Dysmorphic Features in a Patient With Nonketotic Hypoglycemia and a Pathogenic Variant in the AKT2 Gene.

    Ochoa Molina MF, Poggi H, De Toro V, et al.

    AACE clinical case reports 2022; (8(3)):109-112 doi:10.1016/j.aace.2021.11.006.

    PMID: 35602880
  12. 12

    Continuous Glucose Monitoring-Derived Glycemic Phenotyping of Childhood Hypoglycemia Due to Hyperinsulinism: A Year-long Prospective Nationwide Observational Study.

    Worth C, Auckburally S, Worthington S, et al.

    Journal of diabetes science and technology 2025; (19(6)):1528-1537 doi:10.1177/19322968241255842.

    PMID: 39564699
  13. 13

    PIK3CA-Related Overgrowth Spectrum: Exploring brain growth from fetus to infant.

    Andrade BP, Hierro F, Castro J, et al.

    Pediatric neurology 2025; (163()):12-14 doi:10.1016/j.pediatrneurol.2024.11.002.

    PMID: 39631263

This page is for informational purposes only and does not constitute medical advice about your child's hypoglycemia or hemihypertrophy. Your child's pediatric clinicians should tailor the care plan, emergency instructions, and screening schedule.

Guide contents Hypoinsulinemic hypoglycemia and body hemihypertrophy
Research & Literature
05 Tumor Screening & Long-Term Monitoring