[Below absolute low-off instrument scale. This is statement depending on the instrument, logically does not imply LL or L (e.g., if the instrument is inadequate). If an off-scale value is also low or critically low one must also report L and LL respectively. ( HL7V3.0 )]
UMLS (HL7) C1550467 Relation/PAR: ObservationInterpretationExceptions