Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.
The example above shows the common measurement range for results for these tests.
Sunlight helps your body to produce vitamin D.
Your caregiver will tell you when to have your blood test done.
All of these can be quantified separately with a blood test, if necessary.
You may also feel some throbbing at the site after the blood is drawn.