2. Alkaptonuria
Alkaptonuria is a rare, inherited disorder characterized by urine that turns dark when exposed to air, dark pigmentation of the cartilage and other tissues, and arthritis.
Healthline.com (OMS Preferred Provider)

3. Alkaptonuria - Genetics Home Reference
Alkaptonuria is an inherited condition that causes urine to turn black when exposed to air. Ochronosis, a buildup of dark pigment in connective tissues such as cartilage and skin, is also characteristic of the disorder. This blue-black pigmentatio...
MedlinePlus (Offsite)

4. Alkaptonuria - Patient support - For patients and families - Genetics Home Reference
These resources supplement the information in the Genetics Home Reference condition summary on alkaptonuria.
MedlinePlus (Offsite)

5. Alkaptonuria
Alkaptonuria is a rare condition in which a person's urine turns a dark brownish-black color when exposed to air.
www.uhseast.com

6. Ocular Syndromes and Systemic Diseases: Alkaptonuria
General: Rare autosomal recessive metabolic disease; enzyme homogentisic acid oxidase missing; both sexes affected; onset in first few days of life; manifestations more severe in males.
www.medrounds.org

7. Alkaptonuria: eMedicine Pediatrics: Genetics and Metabolic Disease
Alkaptonuria is one of 4 disorders originally defined as an inborn error of metabolism by Archibald Garrod in his Croonian Lectures of 1902.
emedicine.medscape.com

8. Alkaptonuria Causes, Symptoms, Diagnosis, and Treatment on MedicineNet.com
What is alkaptonuria? How common is alkaptonuria? What genes are related to alkaptonuria? How do people inherit alkaptonuria? Where can I find information about treatment for alkaptonuria?
www.medicinenet.com

9. Disease InfoSearch: alkaptonuria, Treatment | Genetic Alliance
Disease InfoSearch: alkaptonuria, Treatment
geneticalliance.org

10. Clinical Study: 00-HG-0141, Clinical, Biochemical, and Molecular Investigations into Alkaptonuria
The purpose of this study is to gain a better understanding of alkaptonuria and collect medical data on patients who may later participate in new drug trials for this rare genetic disease. In alkaptonuria, a pigment called homogentisic acid collec...
clinicalstudies.info.nih.gov