Oh dear; it's too bad labs won't quit running that test...sigh...
Since you say your doctor didn't say anything further after ordering the test, I'm going to assume s/he didn't tell you what it means either, so I'll explain that first.
TSH is a pituitary hormone that stands for Thyroid Stimulating Hormone. It stimulates the thyroid to produce the hormones T4 and T3. T4 is considered a "storage" or pro-hormone and must be converted to T3 prior to use. T3 is the hormone that's used by nearly ever cells in your body. Most of the T4 and T3 we have are bound by proteins and can't be used, therefore, for testing purposes, we test for Free T4 and Free T3 so we can see how much of the active hormones we have available for, either conversion in the case of T4 or for use, in the case of T3.
When a doctor orders TSH w/reflex to Free T4, they are telling the lab to analyze TSH and if that result is normal to do nothing else. If the TSH is abnormal, the lab is to analyze Free T4.
In your case, the reference range for TSH is 0.40 - 4.50 and your result is 0.73, which is greater than 0.40 and less than 4.50 so it's within the reference or "normal".
This is an outdated test and typically, doctors that order it are not savvy about thyroid conditions - either diagnosing them or treating them.
It would be helpful to know why your doctor ordered this test. Do you have symptoms of a thyroid condition? If so, please tell us what symptoms and we can go from there...