Pediatric Endocrinology · Classic Salt-Wasting Congenital Adrenal Hyperplasia

Starting the Journey: Your Baby and Classic Salt-Wasting CAH

At a Glance

Classic Salt-Wasting Congenital Adrenal Hyperplasia (SW CAH) is a manageable, lifelong condition where a baby's adrenal glands cannot produce enough cortisol or aldosterone. With early diagnosis and daily hormone replacement medications, children can live full, healthy, and active lives.

Finding out your newborn has Classic Salt-Wasting Congenital Adrenal Hyperplasia (SW CAH) often happens in a whirlwind of medical alarms, neonatal intensive care units (NICUs), or urgent calls from newborn screening offices. It is completely normal to feel overwhelmed, frightened, or even in shock ^[1]^[2].

While this is a serious, lifelong condition, the most important thing to know right now is that it is treatable. With consistent daily medication and an emergency plan, your child can grow up to live a healthy, full, and active life ^[3]^[4].

What is Happening in Your Baby’s Body?

In children with SW CAH, the adrenal glands (small organs that sit on top of the kidneys) are missing an essential tool (an enzyme) needed to make two vital hormones: cortisol and aldosterone ^[5]^[6].

Cortisol deficiency: Cortisol is the body’s “stress hormone.” It helps maintain blood sugar, energy levels, and the body’s response to illness or injury ^[7].
Aldosterone deficiency (Salt-Wasting): This hormone tells the kidneys to keep salt (sodium) in the body and get rid of excess potassium. Without it, the body “wastes” salt in the urine, which can lead to dangerous dehydration and heart rhythm issues ^[3]^[8].
Androgen excess: Because the adrenal glands are working overtime to try to make cortisol, they accidentally overproduce androgens (male-type hormones like testosterone). In baby girls, this may cause the external genitals to look more masculine at birth, though the internal organs (uterus and ovaries) are typically normal ^[9]^[10].

Reassuring Facts for New Parents

As you navigate these first few weeks, keep these three stabilizing facts in mind:

SW CAH is manageable: Your child is missing hormones, not the ability to live. By giving daily replacement medications (hydrocortisone for cortisol and fludrocortisone for aldosterone), you are simply providing what their body cannot make on its own ^[3]^[11].
Early detection saves lives: Because of modern newborn screening, most babies are diagnosed before they reach a critical “salt-wasting crisis” ^[1]^[12]. This early start allows your medical team to stabilize your baby’s electrolytes (salt levels) immediately.
A normal life expectancy is the goal: While SW CAH requires lifelong vigilance, medical advancements mean that children born today are expected to have a normal life span ^[4]^[13]. They can participate in sports, go to college, and have families of their own ^[14].

Your Support Team

You are not alone in this. Your child’s care will be led by a pediatric endocrinologist (a specialist in hormones for children). This doctor, along with specialized nurses and dietitians, will guide you through every milestone, from the first tooth to the first day of school ^[15]^[16]. Training in how to recognize illness and use emergency injection kits will give you the confidence to manage the condition safely at home ^[17]^[18].

Explore the Resource Guide

To help you navigate your child’s care, we have broken down the journey into the following topics:

Understanding the Diagnosis: Biology and Lab Results

Learn how Classic Salt-Wasting CAH is diagnosed. Understand newborn screening, 17-OHP levels, genetic testing, and signs of a salt-wasting crisis in babies.

Daily Medications: The Balancing Act of CAH Treatment

Learn how to manage daily medications for classic salt-wasting CAH. Understand hydrocortisone, fludrocortisone, salt supplements, and how to balance doses.

Emergency Management: Sick Day Rules and Adrenal Crises

Learn critical emergency management for classic salt-wasting CAH. Understand sick day rules, stress dosing, and when to use the Solu-Cortef emergency injection.

Growing Up with CAH: Long-Term Monitoring and Transition to Adulthood

Learn about long-term management for classic salt-wasting CAH. Understand childhood growth monitoring, TARTs, reproductive health, and the adult transition.

Common questions in this guide

What causes salt-wasting CAH in babies?

Salt-wasting CAH is caused by a missing enzyme in the adrenal glands, which prevents them from making enough cortisol and aldosterone. This missing enzyme also leads to an overproduction of male-type hormones called androgens as the body works overtime to correct the imbalance.

What is the standard treatment for classic salt-wasting CAH?

The standard treatment involves giving your baby daily hormone replacement medications. Hydrocortisone is used to replace missing cortisol, and fludrocortisone is used to replace missing aldosterone, which helps the body safely retain salt.

Can a child with salt-wasting CAH live a normal life?

Yes, children born with SW CAH are expected to have a normal life expectancy. By strictly following their daily medication routine and having an emergency plan in place, they can safely play sports, attend school, and grow into healthy adults.

What happens when a child with CAH gets sick?

During physical stress or illness, the body requires extra cortisol to function properly. Parents are provided with a 'stress dose' schedule by their pediatric endocrinologist and trained to use emergency injection kits to prevent a life-threatening adrenal crisis.

Why does CAH affect the appearance of a baby girl's genitals?

Baby girls with SW CAH may be born with external genitals that look more masculine due to the excess androgens produced in the womb. However, their internal reproductive organs, such as the uterus and ovaries, are typically completely normal.

Curated prompts to bring to your next appointment.

1.Based on my child's labs, how severe is their salt-wasting, and what are their specific starting doses for hydrocortisone and fludrocortisone?
2.Can you provide an official emergency letter and a 'stress dose' schedule for me to give to daycare, school, or the ER?
3.How frequently will we need to come in for blood draws, weight checks, and growth monitoring during this first year?
4.How can I reach the on-call endocrinologist if there is an emergency after hours or on the weekend?

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References (18)

1
The progression of salt-wasting and the body weight change during the first 2 weeks of life in classical 21-hydroxylase deficiency patients.
Gau M, Konishi K, Takasawa K, et al.
Clinical endocrinology 2021; (94(2)):229-236 doi:10.1111/cen.14347.
PMID: 33001476
2
A Neonate Presenting with Severe Dehydration: A Rare Case of Congenital Adrenal Hyperplasia with Salt Losing Crisis.
Lamichhane A, Phuyel R, Upreti M, Khadka R
JNMA; journal of the Nepal Medical Association 2024; (62(278)):706-708 doi:10.31729/jnma.8777.
PMID: 40655893
3
Congenital adrenal hyperplasia with salt-wasting crisis and arrhythmia: a case study.
Canlas JF, Ponmani C
BMJ case reports 2019; (12(1)) doi:10.1136/bcr-2018-227565.
PMID: 30700462
4
Review of Health Problems in Adult Patients with Classic Congenital Adrenal Hyperplasia due to 21-Hydroxylase Deficiency.
Reisch N
Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association 2019; (127(2-03)):171-177 doi:10.1055/a-0820-2085.
PMID: 30812049
5
The spectrum of CYP21A2 gene mutations in patients with classic salt wasting form of 2l-hydroxylase deficiency in a Chinese cohort.
Liu Y, Zheng J, Liu N, et al.
Molecular genetics & genomic medicine 2020; (8(11)):e1501 doi:10.1002/mgg3.1501.
PMID: 32959514
6
Adrenal steroidogenesis and congenital adrenal hyperplasia.
Turcu AF, Auchus RJ
Endocrinology and metabolism clinics of North America 2015; (44(2)):275-96.
PMID: 26038201
7
MECHANISMS IN ENDOCRINOLOGY: Rare defects in adrenal steroidogenesis.
Miller WL
European journal of endocrinology 2018; (179(3)):R125-R141.
PMID: 29880708
8
SOCIETY FOR ENDOCRINOLOGY ENDOCRINE EMERGENCY GUIDANCE: Emergency management of acute adrenal insufficiency (adrenal crisis) in adult patients.
Arlt W,
Endocrine connections 2016; (5(5)):G1-G3 doi:10.1530/EC-16-0054.
PMID: 27935813
9
Antenatal Diagnosis and Treatment in Congenital Adrenal Hyperplasia Due to 21-hydroxylase Deficiency and Congenital Adrenal Hyperplasia Screening in Newborns
Yavaş Abalı Z, Kurnaz E, Güran T
Journal of clinical research in pediatric endocrinology 2025; (17(Suppl 1)):33-43 doi:10.4274/jcrpe.galenos.2024.2024-6-10-S.
PMID: 39713885
10
Absence of uterus and presence of verumontanum in a 46 XX patient with Congenital adrenal hyperplasia reared as male: A case report with literature review.
Bapir R, Aghaways I, Ahmed SF, et al.
Urology case reports 2025; (60()):103028 doi:10.1016/j.eucr.2025.103028.
PMID: 40236908
11
[Recommendations for the diagnosis and treatment of classic forms of 21-hydroxylase-deficient congenital adrenal hyperplasia].
Rodríguez A, Ezquieta B, Labarta JI, et al.
Anales de pediatria (Barcelona, Spain : 2003) 2017; (87(2)):116.e1-116.e10 doi:10.1016/j.anpedi.2016.12.002.
PMID: 28161392
12
Recent advances in biochemical and molecular analysis of congenital adrenal hyperplasia due to 21-hydroxylase deficiency.
Choi JH, Kim GH, Yoo HW
Annals of pediatric endocrinology & metabolism 2016; (21(1)):1-6 doi:10.6065/apem.2016.21.1.1.
PMID: 27104172
13
Caring for Patients With Congenital Adrenal Hyperplasia Throughout the Lifespan.
Zwayne N, Chawla R, van Leeuwen K
Obstetrics and gynecology 2023; (142(2)):257-268 doi:10.1097/AOG.0000000000005263.
PMID: 37473408
14
Classic congenital adrenal hyperplasia and its impact on reproduction.
Gomes LG, Bachega TASS, Mendonca BB
Fertility and sterility 2019; (111(1)):7-12 doi:10.1016/j.fertnstert.2018.11.037.
PMID: 30611420
15
Elective Reconstruction for Children With Congenital Adrenal Hyperplasia: Evaluating Association of Familial Characteristics.
Heller K, Madura G, Nawara N, et al.
The Journal of surgical research 2025; (313()):291-296 doi:10.1016/j.jss.2025.06.029.
PMID: 40680596
16
Treatment and Follow-up of Congenital Adrenal Hyperplasia Due to 21-hydroxylase Deficiency in Childhood and Adolescence
Peltek Kendirci HN, Ünal E, Dündar İ, et al.
Journal of clinical research in pediatric endocrinology 2025; (17(Suppl 1)):12-22 doi:10.4274/jcrpe.galenos.2024.2024-6-26-S.
PMID: 39713876
17
Adrenal insufficiency.
Husebye ES, Pearce SH, Krone NP, Kämpe O
Lancet (London, England) 2021; (397(10274)):613-629 doi:10.1016/S0140-6736(21)00136-7.
PMID: 33484633
18
Adrenal insufficiency.
Hahner S, Ross RJ, Arlt W, et al.
Nature reviews. Disease primers 2021; (7(1)):19 doi:10.1038/s41572-021-00252-7.
PMID: 33707469

This page provides educational information about Classic Salt-Wasting CAH for new parents. It does not replace professional medical advice or treatment plans provided by your pediatric endocrinologist.

Get notified when new evidence is published on Classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency, salt wasting form.

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

Guide Contents