T (Thymus Derived) Lymphocyte Count. Definition. T cells are a type of white blood cells (lymphocytes). They make up part of the immune system. T cells help the body fight diseases or harmful substances. A test can be done to measure the number of T cells in your blood. Thymus derived lymphocyte count; T-lymphocyte count.
The road test generally takes 15 to 20 minutes. 1  If you fail the road test you must wait a minimum of two weeks (14 days) before taking the road test again and must pay another $40 testing fee. 2  Test results are valid for 2 years. If you fail the road test you must wait a minimum of two weeks (14 days) before taking the road test again and must pay another $40 testing fee. 2  Test results are valid for 2 years.
How long does it take to book a driving theory test. It will take approximately 10 minutes to book a driving theory test. Ensure you have your Great Britain or Northern Ireland driving licence number and credit or debit card at hand and once you have booked the theory test, check your email for confirmation.ook a driving theory test by telephone. A theory test telephone booking can be made by calling the. âs automated telephone booking line on 0300 200 1122. If you have any issues, a DVSA member of staff can be contacted by listening to the options provided.