Is it humanly possible to get a blood pressure of 400 / 300?

1] Any human would have a stroke and/or a heart attack before reaching that pressure.

2] don't think most machines can measure a BP that high

1

No, the blood vessels and th heart cannot withstand that kind of pressure.

Almost all the blood vessels will rupture within a few seconds of encountering the pressure this high.

P.S

To Brad : Capillaries would be the least of your concern, according to Laplace's Law, the larger the radius of a vessel, the more tension its wall faces under a given pressure. The first of the blood vessels to burst will be the heart and the aorta and the larger veins (I know it sounds contradictory, the heart muscle being very strong, but thats the way it happens.) Also the blood density need not increase, vaso-constriction will also increase in pressure. If the blood is cement like, there won't be any blood flowing and hence there wont be ANY pressure on the wall (Bernoulli's Theorem)

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On a physiological basis, no, this would not in any possible way be possible. The big issue here would be capillaries and arteries more than veins (being capacitance vessels). Capillaries, you must realize, are a SINGLE layer of endothelial cells. What you're asking is that the body take up to 8 psi. Do you think a square inch of cells could take the weight of a baby? Or on a larger scale, 64 square inches, (8 in x 8 in) could take 512 lbs? Not to mention the fact of how much blood it would take to reach this. The blood would have to be incredibly dense to a point where it was nearly cement-like in density. On top of ALL of this, the pressure on your vital organs would be so much that it would crush any living tissue surrounding.

Point being: You would die. Immediately.

That's only possible if you study your butt of for months and take a few good SAT Prep courses. But unless you have no life, that's probably not gonna happen all at once. It would be best to set a reachable goal and then keep setting it higher and keep going because that would boost your confidence. But it depends on how much time you have left to take it because if you don't have that much time, you'll probably only go up by 100 max.

Beavis And Butthead Blood Pressure

The highest I had personally taken by machin and then rechecked manually was about 270/ 100. The pt had high blood pressure and I believe was a dialysis patient. They always have high bp.

no, you would literally explode