Table 2.
Leading diseases and topics of inquiries, 2002–2016 (N = 60,106)
| Disease or Condition | Number |
| Undiagnosed condition | 4,436 |
| Trimethylaminuria | 659 |
| Morgellons disease | 310 |
| Ehlers-Danlos syndrome | 288 |
| Adiposis dolorosa | 239 |
| Familial Mediterranean fever | 230 |
| Hidradenitis suppurativa | 228 |
| Cystic fibrosis | 223 |
| Factor V Leiden thrombophilia | 212 |
| Klinefelter syndrome | 185 |
| Tarlov cysts | 176 |
| Sickle cell anemia | 171 |
| Huntington disease | 162 |
Of the 60,106 inquiries GARD has received over 15 years, these are the diseases about which GARD has received the most questions. GARD has answered questions about more than 4,200 diseases.