Hi dr, what does these means from lab report: no yeast cells, trichomonas vaginalis or gram negative intracellular diplococci or clue cells seen.

Details matter: It means a lab technician looked at a sample (likely from a vagina) and did not see yeast cells (many yeast cells would mean vaginal thrush), did not see Trichomonas (those would be tiny swimmers with 5 tails), did not see gram negative diplococci (those could be gonorrhea), did not see clue cells (clue cells with a malodorous vagina would be bacterial vaginosis). So, NOT seeing these is good.