Question 1

Do I need to fast for these tests?

Accepted Answer

eGFR, ALT, CRP and ESR do not usually need fasting. If glucose or a lipid panel is drawn at the same time, you may be asked to fast. Avoid a very hard workout the day before, since it can raise ALT and CRP for a while.

Question 2

What is a normal eGFR?

Accepted Answer

An eGFR of 90 or above is normal, and 60 to 89 can be normal for older adults when there are no other signs of kidney damage. A result below 60 for three months or more meets the definition of chronic kidney disease.

Question 3

Is a high ALT serious?

Accepted Answer

Usually it is mild and has a common cause such as fatty liver, alcohol or a medicine. Very high values, or a raised ALT with yellowing of the skin or eyes, dark urine or belly pain, need prompt medical attention.

Question 4

Should I get CRP or ESR?

Accepted Answer

Your clinician chooses. CRP is better for following a fast-changing problem such as an infection; ESR is often used for some long-term inflammatory conditions. Many clinicians order both.