is available, is not available

is available evaluates as True if there is a value (numeric or text) for the current episode. Similarly, is not available evaluates as True if there is no value for the current episode. For example, given the following case fragment:

	Cholesterol    7.3    5.6    6.1
	Triglyceride   1.1    0.8     pending
	HDL                   2.2

Cholesterol is available

Triglyceride is available

HDL is not available

Also: at least 2 Cholesterol are available