SAT317 Adrenal Insufficiency Diagnosed During Pregnancy

Disclosure: A. Rosado-Burgos: None. L.N. Madera Marin: None. M.A. Ortiz-Rivera: None. L. El Musa Penna: None. W. Medina-Torres: None. L.R. Sepulveda-Garcia: None. M. Alvarado: None. L.A. Gonzalez-Rodriguez: None. M. Ramirez: None. Introduction: Primary adrenal insufficiency (AI) that is a potentially life-threatening condition and commonly associated to destruction of adrenal cortex by autoantibodies. AI predominantly affects women of reproductive age and can affect the outcome and course of pregnancy, causing reduced parity, risk of preterm birth, and low birth weight. Symptoms of AI are nonspecific and can result in a challenging diagnosis. Clinical case: 25 year-old pregnant female G1P0A0 at 12 weeks gestational age (WGA) with long standing history of Type 1 Diabetes Mellitus (DMT1) and Hypothyroidism. She was evaluated while hospitalized for metabolic control during pregnancy. The patient had been previously admitted at 7 WGA with hyperglycemic episodes requiring insulin dosing adjustments. Now, 5 weeks later, was found with numerous hypoglycemic episodes even after omitting pre-prandial insulins. Additionally, she had persistent fatigue, general malaise, nausea, vomits, anorexia, and difficulty concentrating. Laboratory workup showed a TSH of 22.96 uIU/mL (nl 0.4-4.0), FreeT4 0.91 (nl 0.89-1.74), that had been within normal limits 6 weeks prior. She reported taking pre-natal vitamins only one hour after LT4, therefore malabsorption was suspected. Insulin requirements were decreased by 50%. Vitals signs without evidence of hemodynamic instability and laboratory workup without electrolyte nor acid base disturbances. However, due to clinical presentation and history of other autoimmune diseases, AI was suspected. Severe hypothyroidism, AI and hyperemesis gravidarum can mimic several features of each other’s clinical presentation. Midmorning cortisol level was found at 7.8 ug/dl (nl for pregnancy >19) but no ACTH levels taken prior to replacement. Considering acuteness and severity of symptoms it was decided to administer IV LT4 equivalent dose which can increase cortisol metabolism precipitating adrenal crisis. For this reason, stress dose hydrocortisone (HC) was empirically administered. Rapid clinical improvement was observed after LT4 and corticosteroid replacement therapy with resolution of nausea, vomits, anorexia as well as hypoglycemic episodes and was discharge home with her usual LT4 PO dose and corticosteroid replacement therapy. Twenty-one-alpha hydroxylase antibodies were positive, making the diagnosis of primary adrenal insufficiency highly suspected. Conclusion: Presentation was consistent with Polyglandular Autoimmune Syndrome Type 2. Diagnosis of AI during pregnancy is rare as it is considered a hypercortisolemic state. Changes in cortisol levels during pregnancy make the diagnosis of AI even more challenging. Dynamic testing can be considered, however, most of these studies have not been validated in pregnancy. In this case patient continues with HC replacement therapy while in her 3(rd) trimester of pregnancy without any maternal of fetal complications. Presentation: Saturday, June 17, 2023