I asked a question if turmeric and or curcumin when ingested as a spice on prepared restaurant food cause false negative for blood at urinalysis. the answer received was specific to false positive no mention to false negative. will this cause false n?

No False Negative: Neither Turmeric nor Curcumin should interfere with the detection of blood in a urinalysis. A false negative means that blood is not detected even when it is present. Because of how the urinalysis is conducted, blood is detected both by chemical means on a dipstick and by microscopic means by looking for red blood cells in a microscope. Turmeric and Curcumin do not interfere with this.

Agree with Dr. K: Neither of these spices/chemicals would cause a false negative urine test. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Wish you good health!