Table 1-.

Categories of relationships and their descriptions

Relationship	Description
AQ	has allowed qualifier e.g. Myopathy AQ, prevention & control
CHD	has child relationship e.g. Anemia CHD Mild anemia
PAR	has parent relationship e.g. Asthma PAR Bronchial Disease
QB	can be qualified by
RB	has a broader relationship with e.g. Angina RB Pain
RL	the relationship is similar or "alike."
RN	has a narrower relationship with e.g. Hernias RN Hernia, Paraesophageal
RO	has other relationship e.g. Ciprofloxacin RO Cipro 250 MG Tablet
RQ	related and possibly synonymous. e.g. Asthma RQ, Wheezing
RU	Related, unspecified
SIB	has sibling relationship e.g. Acne SIB Skin Cancer
SY	the source asserted synonymy e.g. Diarrhea SY Dysentery
XR	not related, no mapping