Appendix five: two character codes for subheadings
2004 version 2
24 May 2004
Ovid two character codes for subheadings
Subheadings are characterised by a forward slash followed by a two character code. These denote subheadings for Medical subject headings (MeSH headings) as described in section 5.4. Example: aids/dt means drug therapy of aids.
Definition /subheading code
Abnormalities /ab
Administration and dosage /ad
Adverse effects /ae
Agonists /ag
Analogs and derivatives /aa
Analysis /an
Anatomy and histology /ah
Antagonists and inhibitors /ai
Biosynthesis /bi
Blood /bl
Blood supply /bs
Cerebrospinal fluid /cf
Chemical synthesis /cs
Chemically induced /ci
Chemistry /ch
Classification /cl
Complications /co
Congenital /cn
Contraindications /ct
Cytology /cy
Deficiency /df
Diagnosis /di
Diagnostic use /du
Diet therapy /dh
Drug effects /de
Drug therapy /dt
Economics /ec
Education /ed
Embryology /em
Enzymology /en
Epidemiology /ep
Ethnology /eh
Etiology /et
Genetics /ge
Growth and development /gd
History /hi
Immunology /im
In adolescence /ao
In adulthood /au
In infancy and childhood /ic
In middle age /my
In old age /oa
In pregnancy /pr
Injuries /in
Innervation /ir
Instrumentation /is
Isolation and purification /ip
Legislation and jurisprudence /lj
Manpower /ma
Metabolism /me
Methods /mt
Microbiology /mi
Mortality /mo
Nursing /nu
Organization and administration /og
Parasitology /ps
Pathogenicity /py
Pathology /pa
Pharmacokinetics /pk
Pharmacology /pd
Physiology /ph
Physiopathology /pp
Poisoning /po
Prevention and control /pc
Psychology /px
Radiation effects /re
Radiography /ra
Radionuclide imaging /ri
Radiotherapy /rt
Rehabilitation /rh
Secondary /sc
Secretion /se
Standards /st
Statistics and numerical data /sn
Supply and distribution /sd
Surgery /su
Therapeutic use /tu
Therapy /th
Toxicity /to
Transmission /tm
Transplantation /tr
Trends /td
Ultrasonography /us
Ultrastructure /ul
Urine /ur
Utilization /ut
Veterinary /ve
Virology /vi
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