<prompt> Severe HTN cut off is140 mm Hg150 mm Hg160 mm Hg170 mm Hg  <response>: Ans. D 170 mm HgRef: Harrisons, 19th ed. pg. 1616Guidelines for threshold values between normal and high blood pressure Clinic measurement mm HgHome measurement mm HgOptimal control1408513080Mild hypertension140-15090-100135-14585-95Moderate hypertension150-170100-110145-16595-105Severe hypertension170110165105The question mentioned was severe hypertension, however if the grading of hypertension is asked, then answer must be according to this table:BP classificationSystolic mm HgDiastolic, mm HgNormal120and 80Pre-hypertension120-12980Stage 1 HTN130-13980-89Stage II HTN14090Isolated systolic HTN140and 90 