To think this nurse was unprofessional?

Use one machine only, don’t think they are ever as reliable as manual readings, but , provided batteries are good they are accurate enough and as others have said, BP varies, do t get hung up on taking readings, even if you have high blood pressure you do t need to be constantly checking it

This is all very confusing.

If your sister needs to monitor for 7 days why wouldn't she just use the one machine that she was given to do so?

I was called into GP for a similar thing. Going by their readings I should be on meds for hypertension. According to my machine, not. So, had to go in, with my readings and machine and yes, white coat syndrome. So, not stupid at all to want to check it out - could be saving the NHS zillions of pounds for medication I don’t need.
Go again and take the other machine, see what happens then?!

(probably better trying local pharmacist and see if they can check them)

Test it one machine as the nurse advised have no idea why she’s doing it on two

But the GP getting incorrect information from the 7 days tests isn't a waste of his time?

What a waste of NHS time, you are being VERY unreasonable

If they are reading correctly for everyone else it might just be that your SIL suffers from anxiety around her BP and as soon as her BP has been taken there is an increase which the other machine records. There is something called white coat syndrome and hat this means is that for some people as soon as they find themselves in the GPs or their BP is taken it automatically rises.

The machines are both correct! Do you not understand how blood pressure works??? Your bp will be different 5 mins later and the more you take it the more stressed you get and the higher your bp will be

I hear you, OP. Blood pressure is a strange and imprecise science.

I have to have mine read manually. Several doctors have noted that electronic readings tend to be inaccurate for me. This was first observed in pregnancy (manual readings are supposed to be done in pregnancy - not electronic), but it has been the same since. The difference can be up to thirty points on both systolic and diastolic, the electronic readings being higher. Nobody is quite clear why.

Luckily my practice nurse is more patient than yours. She always does a manual reading for me. I have been told time and again that manual readings are more accurate - there are a lot of variables with the machines. But they are quicker, easier, and ultimately cheaper.

Perhaps something like this is going on with your sister. Or you, whichever it is!

What the hell does that have to do with you?

OP the white coat bit is home vs practice readings, not home vs practice machine. If the machine she checked in clinic correlated with hers then it is fine to use that one. Ditch the other one. The difference between home and clinic readings is taken into account when interpreting the results.

Did the nurse take yours/your sister’s blood pressure on the machine in the surgery? If so if it was the same or very similar to one of your own that you use indoors then that one is accurate. You can discard the other one. Or have I completely missed something?

Are those insisting that calibrating BP machines isn't the nurse's job health care professionals? Because our GP surgery offers the exact service the OP is describing to enable more patients to do home heart care and (AFAIK) get more accurate readings due to the flexibility of taking them yourself.

I could understand it it was a case of saying they were only allowed to do one machine per appt or similar, but if they offered to test a machine why not test two - there are plenty of reasons having two could be necessary (two homes, one upstairs one downstairs for eg) so it seems mad to insist that the same one is always used for the sake of a 2.minute check that the OP had been offered for exactly that purpose.

And to those claiming they cannot imagine a situation where someone needs a relative/carer with them for medical appointments, you are coming across as either quite cruel or quite naive.

That’s actually an incorrect (though commonly used) technique. I’m a clinical educator and teach staff and students how to correctly take a manual BP. Most people including my gp last time he took it manually do it wrong.

It really isn't the job of a nurse to check if your home blood machines are working properly. Buy a new one and stop wasting folks time,

@ThisCoolOP I’m really surprised at the grief you’re getting.

Our GP’s frequently book patients in with us and leave a booking note saying to take measurements with home bp monitor and manual reading.

It is a PITA tbh, just because of the level of faff, and it’s even more of a PITA when the patients take it upon themselves to bring theirs monitor AND two weeks of a.m & p.m readings for us to review/compare.

HOWEVER, if it’s good enough for actual Drs to want us to do, I don’t understand nurses, and random joe blogs with no medical qualifications, on here saying you wasted that nurses time.

When they gave you the appointment, I imagine they were expecting that the nurse would take your / your sister's blood pressure and check whether it's ok, to take away all confusion about two monitors. They weren't expecting to check the monitors - that's not the nurse's job.

I don’t understand why you bothered the GP at all to be honest, online or otherwise.

They’re not your personal tech support & you had other ways to sort this out.

You also don’t believe what they said anyway, so you really have just wasted time!