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The guideline is specifically for patients in the mid trimester scan, ie. morphology. In the guideline a specific subgroup for third trimester patients was not included, as there is limited clinical value in performing CL measurements after 24 weeks. Therefore a CL measurement (either TV or TA) is not required in third trimester, unless specifically requested by the referring doctor or as per your radiologist.
If a patient presents to you in third trimester (these would usually be surveillance), to have a CL assessment at the request of the referrer, it is usually appropriate to do a TV scan, as long as it is not contraindicated (ie. Preterm labour).