What Temperature Requires Stress Dosing for a Child With CAH?

When a child with Congenital Adrenal Hyperplasia (CAH) develops a fever or significant illness, their body needs extra cortisol to handle the physical stress. While 100.4°F (38.0°C) is frequently used as a general benchmark for a pediatric fever, major guidelines do not set one universal temperature threshold for every child ^[1][2]. Instead, the exact trigger and the exact stress dose are determined by your child’s individualized, written sick-day action plan. Always follow your endocrinologist’s written plan rather than trying to calculate doses yourself based on general advice. Note: For any infant younger than 3 months, a temperature of 100.4°F (38.0°C) or higher requires an urgent medical evaluation regardless of your stress-dosing plan.

The Standard Protocol: Follow Your Individualized Plan

There is no single “standard” dose that applies to every child. International guidelines show that different clinics may prescribe two or three times your child’s usual daily dose depending on their age, the specific medication formulation, and the severity of the illness ^[1].

Instead of guessing, rely entirely on your child’s written sick-day plan, which should clearly specify:

• The exact temperature threshold or illness triggers for your child.
• The specific stress dose in milligrams (mg) or milliliters (mL).
• The dosing schedule (often given evenly every 8 hours).
• When to contact the care team and how to slowly return to the maintenance dose once the fever has resolved.

What about Fludrocortisone?
Many children with salt-wasting CAH take a second medication called fludrocortisone to help the body retain salt and maintain blood pressure. During a fever, you should continue your child’s prescribed fludrocortisone and salt supplements exactly as usual unless your endocrinology team specifically instructs you otherwise ^[3].

Action Pathway: Managing Illness and Vomiting

Vomiting and severe diarrhea are critical escalation points because your child may not absorb their oral hydrocortisone, putting them at rapid risk of an adrenal crisis ^[1]. An adrenal crisis is a severe, life-threatening lack of cortisol that requires immediate medical intervention ^[4].

Follow this general sequence when managing stomach illness, but always defer to your specific written plan:

1. Vomiting once shortly after a dose: Many action plans advise that if your child vomits within 30 to 60 minutes of taking their oral hydrocortisone, you should give a replacement oral dose.
2. Repeated vomiting or severe diarrhea: If your child vomits the replacement dose, continues vomiting, or has persistent diarrhea, their digestive system cannot absorb the medication. You must switch to parenteral hydrocortisone (an emergency medication given via injection, such as Solu-Cortef) ^[1].
3. After the injection: Giving the emergency injection is only the first step. You must immediately seek urgent emergency medical care for further evaluation ^[4]. Do not wait at home to see if your child improves.

When to Call 911 (Emergency Medical Services)

Certain warning signs mean your child is progressing toward an adrenal crisis and needs an immediate intramuscular (IM) emergency injection and an ambulance ^[1]. Give the emergency IM injection and call 911 if your child has:

• Extreme lethargy, severe fatigue, or is difficult to wake up ^[1][5]
• Signs of shock, such as fainting, collapse, confusion, extreme pallor (paleness), or rapidly worsening weakness ^[5][6]
• Seizures, which can be triggered by dangerous drops in blood sugar (hypoglycemia) or sodium ^[5][6]

Crucial Safety Warning: Never put oral medication, food, or fluids into the mouth of a child who is unconscious, actively seizing, or unable to swallow safely, as they could choke. Give the emergency IM injection and wait for paramedics.

What to Expect in the Emergency Department

Once at the hospital, the medical team will assess your child based on their vital signs and laboratory results. Treatment may include intravenous (IV) hydrocortisone, IV fluids to correct dehydration, and glucose (sugar) to stabilize blood sugar levels ^[4][6]. Depending on how your child responds and the underlying cause of the fever, they may be observed in the emergency department or admitted to the hospital ^[1].