What happens during an MMA test?
MMA levels may be checked in blood or urine. 
During a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
During a newborn screening, a health care provider will clean your baby's heel with alcohol and poke the heel with a small needle. The provider will collect a few drops of blood and put a bandage on the site.
MMA urine testing may be ordered as a 24-hour urine sample test or a random urine test.
For a 24-hour urine sample test, you'll need to collect all urine passed in a 24-hour period. Your health care provider or a laboratory professional will give a container to collect your urine and instructions on how to collect and store your samples. A 24-hour urine sample test generally includes the following steps:
Empty your bladder in the morning and flush that urine away. Record the time.
For the next 24 hours, save all your urine passed in the container provided.
Store your urine container in the refrigerator or a cooler with ice.
Return the sample container to your health care provider's office or the laboratory as instructed.
For a random urine test, your sample of urine may be collected any time of the day.
