| Abbreviation | Definition |
|---|---|
| HA | hepatic artery |
| HA | hepatitis A |
| HA | hepatitis-associated |
| HA | heterophil antibody |
| HA | high affinity |
| HA | hippuric acid |
| HA | Hispanic American |
| HA | histocompatibility antigen |
| HA | hospital-acquired |
| HA | human albumin |
| HA | hydroxyapatite |
| HA | hyperactivity |
| HA | hyperaldosteronism |
| HAA | hepatitis-associated antibody |
| HAAC | Health Action Area Coordinator |
| HAI | haemagglutination inhibition |
| HAI | healthcare-associated infection |
| HAI | hepatic arterial infusion |
| HAI | hospital-acquired infection |
| HAQ | Health Assessment Questionnaire |