| HAART | highly active antiretroviral therapy |
|---|---|
| HAB | histoacryl blue |
| HABA | 2(4'-hydroxyazobenzene) benzoic acid |
| HABF | hepatic artery blood flow |
| HACE | High Altitude Cerebral Edema |
| HACEK | Haemophilus, Actinobacillus, Cardiobacterium, Eikinella, Kingella |
| HAChT | high affinity choline transport |
| HACR | hereditary adenomatosis of the colon and rectum |
| HACS | hyperactive child syndrome |
| hACSP | human adenylate cyclase-stimulating protein |