Synonyms: AHO-PHP syndrome Ia | Albright hereditary osteodystrophy-PHP syndrome Ia
Pseudohypoparathyroidism type 1A (PHP1a) is a type of pseudohypoparathyroidism (PHP; see this term) characterized by renal resistance to parathyroid hormone (PTH) resulting in hypocalcemia hyperphosphatemia and elevated PTH; resistance to other hormones including thydroid stimulating hormone (TSH) gonadotropins and growth-hormone-releasing hormone (GHRH); and a constellation of clinical features known as Albright hereditary osteodystrophy (AHO; see this term).
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
Newly diagnosed with
Pseudohypoparathyroidism type 1A?
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Advocacy Organizations
Genetic Support Network of Victoria
The Genetic Support Network of Victoria is an organisation that supports people living with genetic, undiagnosed and rare conditions and those who support them including community and families, patient support organisations, health professionals and industry. Our vision is our community flourishing and living their best lives.
HypoPARAthyroidism Association, Inc
We work to improve the lives of people impacted by hypoPARAthyroidism through education, support, research, and advocacy. We strive to be a reliable, dedicated, accessible, inclusive, empowering resource while being compassionate and professional.
The Chandler Project
The Chandler Project brings awareness and shines a light on transformative research surrounding achondroplasia and other skeletal dysplasias by offering support to a global community and network of patients, parents, and caregivers seeking information on scientific discoveries, pharmaceutical advancements and surgical treatment options.
Wave of Support, Inc
Empowering those affected by bleeding disorders and other rare disease through advocacy, resources, education, and support
accessia health
Accessia Health, a national charitable patient assistance organization, is dedicated to eliminating healthcare barriers for people with rare or chronic health conditions. Comprehensive services include personalized case management, financial assistance, education, and legal aid support. Our flexible funding model goes beyond copays, allowing individuals to pay for other essential medical expenses
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Clinical Trials
For a list of clinical trials in this disease area, please click here.