To think MIL should know DH is in hospital having serious tests, even though she's on holiday

I wouldn’t even tell my mum if she was 10mins down the road.

Why worry someone unnecessarily.

Haven’t RTFT but I would tell MIL in this scenario. DH doesn’t want to tell her because he is thinking of her holiday NOT because he doesn’t want her there. If it was the latter, I’d respect his decision not to tell her. But he is trying to be selfless when he is feeling alone and would benefit from her being there and she would probably want to be there for him, and OP may get some comfort from knowing he isn’t alone. So not telling her seems a lose-lose situation. (I’ve read the OPs posts so I know many disagree)

@hmmwhat1 hoping for the best for your DH.

My experience is the opposite however that might be due to me being quite young still so the majority of deaths have been young people so have always been sudden and unexpected suicide,murder, car crashes, sids, cardiac arrest, brain bleed, asthma attack, drug overdose etc.

No. His family, he decides. We have a rule in our family that if people are on holiday we don't give them bad news unless they have to come, ie dying. some relatives went against this once and rang my parents in italy to tell them I'd been in a car accident. I was beyond furious.

@Differentstarts I don't think most people die unexpectedly. My father did, but most of my other relatives who have died, there is at least short illness, and in many cases protracted ones, and it sounds like in this case the OP is talking about a fairly young person.
I was just saying my own opinion, I get that the OP's husband is saying what he wants, but it is just a real shame that's all.

I would follow DH's wishes and not contact his mother.

I think OP feels awkward as the WA chat is ongoing as if they are all lying / concealing things.

It's your DHs news and his decision whether to share it You need to grow up and shoulder your responsibility as a wife

But most people die unexpectedly and you don't get to say goodbye it's unfortunate but that's life

It's a bit hard to give an opinion OP as you don't give any indication of how sick he is currently or what the presenting features were .. presumably acute to still be an IP but if more a case of ruling out to be on safe side and he's well then that obviously different from he's sick, unstable or a serious diagnosis looks very likely.
Simply not enough info

Indeed

It really doesn't matter what the potential diagnosis is, but how sad is it, if it is the worst case scenario and your mother in law was not able to see her son in time. I can't imagine that. I appreciate your husband is trying to not worry anybody needlessly but if it were that serious, she will be absolutely distraught to not have the chance to come home to see him.

As a mum I'd want to know but as it's your husband's decision I would abide by his wishes. I can understand why he's reluctant to interrupt the holiday too. Unless you know that he's not likely to survive long enough for MIL to return, I would follow his lead and wishes. Although it might help him to have his mum with him, he would feel betrayed by you and potentially more stressed by you contacting her.
If you feel that he's making a mistake that he's going to regret or she is, then talk to him and try to get his consent first. I'm keeping my fingers crossed for you that there's not a devastating diagnosis and he makes a full recovery soon. Sending healing thoughts your way!!

An angiogram is a test not a diagnosis

It is ultimately the decision of your husband, who has decided not to tell his mum right now. The majority of mums would want to know and get the first flight home. But that’s irrelevant. You’d be going against your husbands wishes and you have no right to do that. Respect him enough to do it his way. Perhaps organise some child care so you can spend more time at the hospital.

Or cerebral aneurysm
Or angiogram

If potential AAA that can be diagnosed quickly by CTA usually on admission if a concern so think that less likely.
Maybe a faulty valve or endocarditis etc

Or Echo ??

this is someway similar when politician's are on holiday and theres a crisis back at x location, overall what difference would knowing make ? if the situation can be managed by the necessary people etc then in theory it just causes more issues ?

Sounds to me like a potential aneurysm possibly (AAA) so awaiting scans and tests. Before surgery can happen It's obviously not cancer as you don't die Instantly from that

I get that but I assume the OP needs support as well, MiL could help with the kids and allow the OP to be with her husband. Could you put it this way to your husband? he is being the dutiful stoic son but if he thinks it might help YOU he might be persuaded to tell her.

That sounds hard like you must feel you are concealing it - I'd hate that too.
If Dh is fully compos mentis and has capacity then I agree following his wishes is all you can go, if he deteriorates and loses capacity goes to ITU or something then tell her straight away.
Can you tell me the test? Is it MRI?

She would want to know I think. We were in the reverse situation on our honeymoon my FIL had a stroke and the family were dithering about whether to tell us but we’re glad they did

Oh how awful. Hope all is okay.

Do you know what the specific rest is awaited / how long it takes - are we talking Ct, or MRI, or biopsy or what??