A cortisol blood test is usually done twice a day–once in the morning when cortisol levels are at their highest, and again around 4 p.m., when levels are much lower. Cortisol may also be measured in a urine or saliva test.
CLOTTED BLOOD OR SERUM
7 TO 8 DAYS
The VDRL test is a screening test for syphilis. It measures substances (proteins), called antibodies, which your body may produce if you have come in contact with the bacteria that cause syphilis.
A vitamin B-12 level test checks the amount of vitamin B-12 in the blood or urine to gauge the body’s overall vitamin B-12 stores. Vitamin B-12 is necessary for several bodily processes, including nerve function and the production of DNA and red blood cells.
A troponin test measures the levels of troponin T or troponin I proteins in the blood. These proteins are released when the heart muscle has been damaged, such as occurs with a heart attack. The more damage there is to the heart, the greater the amount of troponin T and I there will be in the blood.
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