Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
It's calculated from basic metabolic panel results; no separate test is needed.
Why it's done
- Checking acid-base balance in very sick patients
Getting ready and what happens
- None.
How the test is done
- Calculated from a metabolic panel.
What the results mean
| Result | Typical range for adults |
|---|---|
| Anion gap | About 4 to 12 mEq/L (depends on the lab's method) |
Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.
High
Can come from diabetic ketoacidosis, lactic acidosis, kidney failure, or some poisonings.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related tests
Sources
Last updated 2026-11-13.