"In some cases, a more extensive diagnostic workup may be recommended..." 

If minor abnormalities are found on the biochemistry profile, the veterinarian may simply request that you repeat the tests at a later time; depending on the abnormality, this may be in a few days, a few weeks, or a few months.

In some cases, a more extensive diagnostic workup may be recommended, including an expanded biochemistry profile, or special tests and/or imaging (X-rays, ultrasound).

Urinalysis - Urine evaluation includes an analysis of the chemical components in the sample as well as a microscopic examination of the cells and solid material that may be present. Urinalysis provides information about how well the kidneys are working, identifies the presence of inflammation or infection in the kidneys and urinary system, and may detect the presence of underlying metabolic diseases such as diabetes. Urinalysis is necessary for a complete assessment of the urinary system. It should be performed routinely as part of wellness testing and is especially important whenever there is concern about kidney function or an underlying metabolic disease.

Thyroid testing - The thyroid gland is like a thermostat, which 'sets' the metabolic rate of the whole body. The most common thyroid disease in dogs is hypothyroidism, which occurs when the thyroid gland does not produce enough thyroid hormone. The function of the thyroid gland should be tested routinely in middle-aged to older dogs, or if a dog of any age shows symptoms such as unexplained weight gain, lack of energy, recurring skin or ear infections, or hair loss on the body tail.