High glucose on a CMP can also read falsely low — glucose falls 5–7% per hour in an unseparated tube. Here's what your number really tells you.

CMP electrolytes hide a quiet problem: a potassium of 3.6 is low by MedlinePlus and normal by another widely used reference. Only your lab's range counts.

Liver markers on a CMP are read together, never alone. Clinicians classify liver injury by comparing ALT against ALP — and the ratio changes the answer.

Your CMP checks kidney function with three markers, and BUN alone can rise from simple dehydration. Here is how the three are read together.

Abnormal CMP results are common and rarely mean disease alone. See what flagged glucose, kidney, and liver values signal—and when to seek care.

Getting ready for a CMP test? Most labs want an 8–12 hour fast and plain water only—here's what to skip and why coffee has to wait.

Fasting for a CMP usually means 8 to 12 hours without food, mainly to protect your glucose reading. Here's when it's required—and when it's not.

CMP components fall into four groups—blood sugar, kidneys, liver, and electrolytes. Here's what all 14 values mean and why your lab's ranges may differ.

Your comprehensive metabolic panel measures 14 substances. See what each result means when it runs high or low — and what to ask your provider.