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Definition Kidney function tests are common lab tests used to evaluate how well the kidneys are working. See links below for details of how each test is performed: BUN Creatinine - blood Creatinine clearance Creatinine - urine How the test is performed How to prepare for the test How the test will feel Why the test is performed
You show up at the laboratory for a fasting cholesterol (lipid) panel. Although the doctor's office advised you to not eat anything after midnight, you forgot. Out of habit, you went ahead and ate breakfast. You didn't even realize your mistake until you arrived at the lab and the technician asked if you'd been fasting.
Was your trip wasted? Should you just reschedule and come back fasting?
Well, if the results of two large studies offer any insight, no: You may have done the smartest thing you could have done, in fact.
First of all, why is it that we nearly always check fasting levels? No study has ever demonstrated that fasting triglycerides are, in any way, superior to non-fasting levels drawn after eating.
There are two principal reasons. One: Triglycerides increase with tremendous variation after a meal, depending on how much fat was in the meal, what kind of fat, how overweight you are, the presence of pre-diabetes or diabetes, how depleted you are in...
An insulin testis a blood test that measures the amount of insulin, a hormone that regulates blood sugar.
How the test is performed
Blood is drawn from a vein on the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic, and an elastic band is placed around the upper arm to apply pressure and restrict blood flow through the vein. This causes veins below the band to fill with blood.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. After the blood is drawn, the band is removed to restore circulation. Then, the needle is removed, and the puncture site is covered to stop any bleeding.
For an infant or young child:
The area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container. Cotton or a bandage may be applied to the puncture site i...
You should know
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