is high, is normal, is low

is high evaluates as True if the value is above the high value of the reference range. Similarly, is normal evaluates as True if the value is within the reference range.

Similarly, is low evaluates as True if the value is below the low value of the reference range. For example, given the following case fragment,

                                 05 Feb 03   23 Oct 03   06 Nov 03
	Cholesterol    [<, 5.5]       7.3         5.6*        6.1*
	Triglyceride   [0, 1.8]       0.8         1.1         1.8
	HDL            [0.9, 3.5]                 2.2         0.5*

Cholesterol is high

Triglyceride is normal

HDL is low

Also:

at least 2 Cholesterol within last 6 months are hig

second most recent HDL is normal