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1.23.3.1.162 HL7 Version 2 Table http://hl7.org/fhir/v2/0162 
This is a table defined as part of HL7 v2.
Formal value Set definition (identifier http://hl7.org/fhir/v2/vs/0162): XML or JSON
Route of Administration
| Code | Description | Version |
| AP | Apply Externally | added v2.2 |
| B | Buccal | added v2.2 |
| DT | Dental | added v2.2 |
| EP | Epidural | added v2.3 |
| ET | Endotrachial Tube* | added v2.3 |
| GTT | Gastrostomy Tube | added v2.2 |
| GU | GU Irrigant | added v2.2 |
| IA | Intra-arterial | added v2.2 |
| IB | Intrabursal | added v2.3 |
| IC | Intracardiac | added v2.2 |
| ICV | Intracervical (uterus) | added v2.3 |
| ID | Intradermal | added v2.2 |
| IH | Inhalation | added v2.2 |
| IHA | Intrahepatic Artery | added v2.3.1 |
| IM | Intramuscular | added v2.2 |
| IMR | Immerse (Soak) Body Part | added v2.3 |
| IN | Intranasal | added v2.2 |
| IO | Intraocular | added v2.2 |
| IP | Intraperitoneal | added v2.2 |
| IS | Intrasynovial | added v2.2 |
| IT | Intrathecal | added v2.2 |
| IU | Intrauterine | added v2.3.1 |
| IV | Intravenous | added v2.2 |
| MM | Mucous Membrane | added v2.3 |
| MTH | Mouth/Throat | added v2.3.1 |
| NG | Nasogastric | added v2.2 |
| NP | Nasal Prongs* | added v2.3 |
| NS | Nasal | added v2.2 |
| NT | Nasotrachial Tube | added v2.3 |
| OP | Ophthalmic | added v2.2 |
| OT | Otic | added v2.2 |
| OTH | Other/Miscellaneous | added v2.3 |
| PF | Perfusion | added v2.3 |
| PO | Oral | added v2.2 |
| PR | Rectal | added v2.2 |
| RM | Rebreather Mask* | added v2.3 |
| SC | Subcutaneous | added v2.2 |
| SD | Soaked Dressing | added v2.3 |
| SL | Sublingual | added v2.2 |
| TD | Transdermal | added v2.2 |
| TL | Translingual | added v2.2 |
| TP | Topical | added v2.2 |
| TRA | Tracheostomy* | added v2.3 |
| UR | Urethral | added v2.2 |
| VG | Vaginal | added v2.2 |
| VM | Ventimask | added v2.3 |
| WND | Wound | added v2.3 |