induration
Noun
Meaning
The act of hardening, or the process of growing hard.
State of being indurated, or of having become hard.
Hardness of character, manner, sensibility, etc.; obduracy; stiffness; want of pliancy or feeling.
Source: Webster's dictionarySynonyms
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For example, a low-risk patient must have a larger induration for a positive result than a high-risk patient.
The reaction is read by measuring the diameter of induration (palpable raised, hardened area) across the forearm (perpendicular to the long axis) in millimeters.
If there is no induration, the result should be recorded as "0 mm".
The size of the induration which is considered to be a positive result depends on risk factors.