What does urine occult blood negative mean?

Negative urine occult blood means that abnormal red blood cells are not detected during routine urine tests, that is, there are no blood components in the urine, which is a normal test result, but it may also be caused by improper urine collection, improper urine storage, and vitamin C intake. Excessive intake and other factors may cause false negatives.

1. Improper urine collection

If contamination occurs during the urine collection process, it may lead to deviation of test results.

2. Improper urine storage If urine is

stored for too long after collection or under inappropriate storage conditions, it may cause false negative results in the urine occult blood test.

3. Excessive vitamin C intake and large

intake of vitamin C may cause false negative results in the urine occult blood test, because the oxidation of vitamin C may interfere with the detection of occult blood.