| Abbreviations | Meaning |
 | HDL | High Density Lipoprotein |
 | HDL | Hardware Description Language; High-density Lipoprotein |
 | HDL-C | High-density Lipoprotein-cholesterol Complex |
 | HDL-C | High-density Lipoprotein-cell Surface |
 | HDLBP | High-density Lipoprotein Binding Protein |
 | HDLP | High-density Lipoprotein |
 | HELP | Heparin-induced Extracorporeal Low-density Lipoprotein Precipitation [treatment] |
 | HGFL | Hepatocyte Growth Factor-like [protein] |
 | HIP | Heparan Sulfate/heparin Interacting Protein |
 | HIPIP | High Potential Iron Protein |
 | HIT | High-Density Lipoprotein Cholesterol Intervention Trial |
 | HLP | Hepatic Lipoperoxidation; Hind Leg Paralysis; Holoprosencephaly; Hyperkeratosis Lenticularis Perstans; Hyperlipoproteinemia |
 | HMCCMP | Human Mammary Carcinoma Cell Membrane Proteinase |
 | HMWGP | High-molecular-weight Glycoprotein |
 | HNP | Hereditary Nephritic Protein; Herniated Nucleus Pulposus; Human Neurophysin |
 | HNRNP, HNRP | Heterogeneous Nuclear Ribonucleoprotein |
 | HNRPG | Heterogeneous Nuclear Ribonucleoprotein Peptide G |
 | HOMSTRAD | Homologous Structure Alignment Database [proteins] |
 | HOP | H. Pylori Outer Membrane Protein |
 | HOX, HOX | Homeobox [protein] |
 | HP | High Protein |
 | HPAFT | Hereditary Persistence Of Alfa-fetoprotein |
 | HPD | Hearing Protective Device; Hereditary Progressive Dystonia; High-protein Diet; Home Peritoneal Dialysis |
 | HPF | Hypocaloric Protein Feeding |
 | HPS | High-protein Supplement |
 | HRF | Homologous Restriction Factor [erythrocyte Surface Protein] |
 | HRG | Histidine-rich Glycoprotein |
 | HRGP | Histidine-rich Glycoprotein |
 | HRP | High-risk Patient; High-risk Pregnancy; Histidine-rich Protein; Horseradish Peroxidase |
 | HS-CRP | High-sensitivity C-reactive Protein |
 | HSGP | Human Sialoglycoprotein |
 | HSP | Heat Shock Protein |
 | HSP | Heat Shock Protein [gene] |
 | HSP | Human Serum Protein |
 | HSPP | Heat Shock Protein Promoter |
 | IAP | Immunosuppressive Acidic Protein |
 | IAP | Integrin-associated Protein |
 | IAP | Islet-activating Protein |
 | IBP | Insulin-like Growth Factor Binding Protein; International Biological Program; Intra-aortic Balloon Pumping; Iron-binding Protein |
 | IBSP | Integrin-binding Sialoprotein |
 | ICBP | Intracellular Binding Protein |
 | ICP | Infectious Cell Protein |
 | ICP | Insecticidal Crystal Protein |
 | IDL | Intermediate Density Lipoprotein |
 | IDL-C, IDL-C | Intermediate Density Lipoprotein-cholesterol Complex |
 | IFABP | Intestinal Fatty Acid Binding Protein |
 | IFP | Intermediate Filament Protein |
 | IGF-I-BP | Insulin-like Growth Factor I Binding Protein |
 | IGFBP | Insulin-like Growth Factor Binding Protein |
 | IGFBP-3 | IGF-binding Protein 3 |