How It Feels
The blood sample is taken from a vein
in your arm. An elastic band is wrapped around your upper arm. It may feel
tight. You may feel nothing at all from the needle, or you may feel a quick
sting or pinch.
There is no pain while collecting a
2-hour or 24-hour urine sample.
There is very little chance of a
problem from having a blood sample taken from a vein.
- You may get a small bruise at the site. You
can lower the chance of bruising by keeping pressure on the site for several
- In rare cases, the vein may become swollen after the
blood sample is taken. This problem is called phlebitis. A warm compress can be
used several times a day to treat this.
- Ongoing bleeding can be a
problem for people with bleeding disorders. Aspirin, warfarin (Coumadin), and
other blood-thinning medicines can make bleeding more likely. If you have
bleeding or clotting problems, or if you take blood-thinning medicine, tell
your doctor before your blood sample is taken.
There are no risks associated with
collecting a 2-hour or 24-hour urine sample.
amylase test measures the amount of this
enzyme in a sample of blood taken from a vein or in a
sample of urine. Many conditions can change amylase levels. Your doctor will
discuss any significant abnormal results with you in relation to your symptoms
and past health.
Results are normally available within 72 hours.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Amylase in blood1
| Adults age 60 and younger:|
units per liter (U/L) or 0.4–2.1 microkatals/liter
|Adults older than age 60:|
24–151 U/L or 0.4–2.5 mckat/L
Amylase in urine1
|2-hour urine sample:|
2–34 U or 16–283 nanokats/hour
|24-hour urine sample:|
24–408 U or 400–6,800 nanokats/day
Amylase/creatinine clearance ratio1
1%–4% or 0.01–0.04 clearance fraction
Values may be high because of: