21-Hydroxylase Deficiency

In a newborn with a screen suggestive of 21-hydroxylase deficiency, arrange urgent pediatric endocrinology assessment and obtain confirmatory serum 17-hydroxyprogesterone, serum electrolytes, and plasma renin activity. Electrolyte disturbance and renin elevation identify infants at risk for salt-wasting crisis. PubMed+1PubMedCongenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice GuidelinePubMedNewborn Screening for Congenital Adrenal Hyperplasia: Review of Factors Affecting Screening Accuracy

Classic 21-hydroxylase deficiency reduces cortisol synthesis and can reduce aldosterone synthesis; affected infants may develop life-threatening salt-wasting crisis. Female fetuses with classic disease may have virilization from androgen excess, but absence of ambiguous genitalia does not reduce concern for adrenal insufficiency in an infant with an abnormal screen. Wolters Kluwer+1Wolters KluwerContemporary global management of 21-hydroxylase... : European Journal of EndocrinologyPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

If clinical concern for classic congenital adrenal hyperplasia is high, cosyntropin testing can be performed at 48 to 72 hours of life, and glucocorticoid treatment is often started while confirmatory results are pending. PubMedPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

For symptomatic individuals past infancy, screen with baseline serum 17-hydroxyprogesterone collected before 8 AM and measured by liquid chromatography-tandem mass spectrometry. In menstruating patients, obtain the sample in the early follicular phase to reduce interpretive error from cycle-related steroid variation. PubMedPubMedCongenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline

A borderline baseline 17-hydroxyprogesterone should trigger a cosyntropin stimulation test with a complete adrenocortical steroid profile rather than a diagnosis based on one indeterminate value. This approach distinguishes 21-hydroxylase deficiency from other steroidogenic enzyme defects. PubMedPubMedCongenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline

A commonly used confirmatory protocol administers 250 micrograms of cosyntropin intravenously and measures serum 17-hydroxyprogesterone plus an adrenal steroid panel at baseline and 60 minutes. The stimulated panel is particularly important beyond the newborn period, when random 17-hydroxyprogesterone may be insufficiently elevated for accurate diagnosis of nonclassic disease. PubMedPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

When stimulated testing remains nondiagnostic, especially in a patient already receiving glucocorticoid therapy, obtain genotyping to clarify the diagnosis. In newborns, genotyping also helps interpret equivocal biochemical results and supports genetic counseling. PubMed+1PubMedCongenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice GuidelinePubMedNewborn Screening for Congenital Adrenal Hyperplasia: Review of Factors Affecting Screening Accuracy

21-Hydroxylase deficiency is caused by pathogenic variants in CYP21A2 and produces impaired cortisol synthesis, accumulation of precursors including 17-hydroxyprogesterone, increased ACTH drive, and shunting toward adrenal androgen production. The biochemical consequence is central to both newborn screening and targeted confirmatory testing. ScienceDirect+2ScienceDirectHypogonadism - an overview | ScienceDirect TopicsPubMedNewborn Screening for Congenital Adrenal Hyperplasia: Review of Factors Affecting Screening AccuracyPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

A complete post-cosyntropin steroid profile is required when 17-hydroxyprogesterone is indeterminate because elevated precursor concentrations are not unique to 21-hydroxylase deficiency. The Endocrine Society recommends this strategy specifically to differentiate 21-hydroxylase deficiency from other enzyme defects. PubMedPubMedCongenital Adrenal Hyperplasia Due to Steroid 21-Hydroxylase Deficiency: An Endocrine Society Clinical Practice Guideline

Consider P450 oxidoreductase deficiency when genital or steroidogenic findings suggest congenital adrenal hyperplasia but electrolytes and mineralocorticoid function are normal, cortisol is nearly normal but has a poor ACTH-stimulated response, sex-steroid precursors are low, and progesterone and 17-hydroxyprogesterone have variable ACTH responses. This pattern should redirect testing toward comprehensive steroid profiling and genotype confirmation rather than assumed 21-hydroxylase deficiency. PubMedPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

Glucocorticoid replacement is the foundational treatment for 21-hydroxylase deficiency because the disorder is characterized by impaired cortisol synthesis and ACTH-driven adrenal androgen excess. In classic disease, intercurrent illness requires glucocorticoid stress dosing; acute illness poses adrenal-crisis risk particularly in salt-wasting 21-hydroxylase deficiency. NEJM+2NEJMPhase 3 Trial of Crinecerfont in Adult Congenital Adrenal ...Wolters KluwerContemporary global management of 21-hydroxylase... : European Journal of EndocrinologyScienceDirectHydrocortisone Release - an overview

For patients with classic salt-wasting disease who cannot take oral fludrocortisone, intravenous hydrocortisone at higher doses with sodium chloride can provide temporary mineralocorticoid effect; 20 mg hydrocortisone is described as equivalent to 0.1 mg 9-alpha-fludrocortisone. ScienceDirectScienceDirectHydrocortisone Release - an overview

Avoid chronic glucocorticoid overtreatment. Adult observational experience describes frequent obesity, adverse health metrics, reduced quality of life, and apparent glucocorticoid overtreatment; chronic therapy in women should use the minimum glucocorticoid amount that maintains an acceptable testosterone concentration, individualized to the patient. ScienceDirectScienceDirectAdrenal Crisis - an overview

In adult males, evaluate testicular masses or infertility with testicular ultrasonography because testicular adrenal rest tumors may be palpable or detectable only by ultrasound. These ACTH-responsive lesions can regress with adequate glucocorticoid therapy and ACTH suppression, whereas inadequate glucocorticoid control promotes growth. ScienceDirectScienceDirectHypogonadism - an overview | ScienceDirect Topics

For women pursuing pregnancy, optimize adrenal replacement before ovulation induction. A follicular-phase progesterone below 0.6 ng/mL (2 nmol/L) is associated with conception; described regimens include multiple daily hydrocortisone and/or prednisolone doses, with a 0.5 to 2 mg bedtime prednisolone dose used alongside daytime hydrocortisone or prednisolone. Ovulation induction may still be needed despite optimized replacement. ScienceDirectScienceDirectAdrenal Crisis - an overview

21-Hydroxylase deficiency is an autosomal recessive disorder associated with pathogenic CYP21A2 variants. Use genotyping as a complement to biochemical testing when neonatal or stimulated steroid findings are equivocal and when genotype clarification will inform family counseling. ScienceDirect+2ScienceDirectHypogonadism - an overview | ScienceDirect TopicsPubMedNewborn Screening for Congenital Adrenal Hyperplasia: Review of Factors Affecting Screening AccuracyPubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf

Prenatal treatment considerations require specialized expertise because affected female fetuses can undergo virilization from prenatal androgen excess. Establishing the familial molecular diagnosis is therefore clinically relevant before reproductive counseling or any prenatal management discussion. Wiley+1WileyPrenatal Treatment of Congenital Adrenal Hyperplasia ...PubMedCongenital Adrenal Hyperplasia - Endotext - NCBI Bookshelf