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The Trial Test Lookup (TL) dataset allows for listing the attributes of the testing regimens used in tobacco product testing when the details are too long and variable for representing as a single value in the PTTSTCND variable . Values of PTTSTCND used in any PT dataset can be described in the TL a PT dataset. 

The example below shows the attributes of the testing regimen identified in as PTTSTCND="E-Liquid Standard Aerosol Condition" (see e-liquid stability study pt.xpt example).   The value of PTSTCND is taken directly from the value of PTTSTCND in the PT dataset from the stability study. Note that the combination of TLVAR1="PTTSTCND" and TLVRVAL1="E-Liquid Standard (Long Term) Condition" identify identifies the specific testing regimen shown in PTTSTCND as the focus of the testing regimen parameters listed in TLPARMCD/TLPAM. TLVAL and TVALU show the specific values and units (respectively, where applicable) for the given parameter.one testing regimen shown in the PT stability study above. 
(We've added TLVALU which was not originally part of the TL draft domain. May propose elevating this structure to a "Trial Lookup" observational class, within which some domains would allow for TLVALU) 

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