<prompt> NaF is used in which color cap vacutainer?GreyYellowRedBlue  <response>: Ans. A. GreyHemogard stopperTube contentDetermination Serum separator tube SSTAll biochemistry not mentioned elsewhere 1 tube, microbiology 1 tubeHeparinChromosome studies, lead, amino acids, troponinFluoride oxalateGlucoseEDTAFull blood count FBC and ESR, C3C4,Hemoglobin A1c, Homocysteine, ACTHPlain no additiveLDH, Ca, drugs phenytoin, theophylline, lithium, endocrine testing except thyroid Sodim citrateCoagulation testing, PT, INR, APTT, D-dimer, etc.ESRWestergren sedimentation rate; requires full draw 