Dear jones10939,
First of all, I would advise you to not pay too much heed to the response from jx41870. S/he, obviously, know very little, to anything, about what s/he is talking about, though vitamin D supplementation should be considered if your husband has to stay on prednisolone for a long time ... and this MAY be the case with the treatment of PMR. (Ideally, it should be a vitamin D3 and Calcium supplement. This is because long-term use of prednisolone is associated with potential bone toxicity, causing osteoporosis.)
Your husband's doctor(s) MAY consider bone mineral density testing, dependent on the sorts of doses, and length of time, that your husband remains on prednisolone.
Unfortunately, as you've found out, prednisolone, which is a corticosteroid DOES affect blood glucose levels. (I'm a type 1 diabetic and was admitted to hospital due to being unable to control my blood glucose levels ... even though I was taking anywhere between 7 and 10 injections of insulin per day. During my hospital stay I was on a continuous insulin infusion 24/7 and remained in hospital for more than 2 months whilst I was gradually 'weaned off' prednisolone.)
It's reassuring that your husband has been requested to attend the Health Centre for 1/2 hour appointment with nurse re diabetic check/management. This indicates that they are fully aware of just how much the taking of prednisolone can affect blood glucose levels. Hopefully, you are already aware of just how much damage can occur to the body's organs, blood vessels, and nerves when blood glucose levels are above the 'normal' range. Don't worry about this, as none of the diabetes-related complications come on suddenly. They take time ... months, or even years, before anything would be noticed. Your husband's doctor(s) would need to 'balance up' whether the risk of continuing with prednisolone for his PMR, and the subsequent rise in his blood glucose levels, can be successfully treated in a way that is beneficial to his long-term health.
I'd be incredibly surprised if your husband was requested to start reducing his prednisolone so soon after diagnosis, ma'am. It's hardly had chance to start working effectively if he was only diagnosed earlier this month.
The HbA1c test offers on 'overall control' reading of blood glucose levels over the previous 3 months, with a slight emphasis on the latter 6 to 8 weeks of that time. (It's based on the lifespan of red blood cells, which survive for anything from 90 to 120 days each. Obviously, not all read blood cells are created, or die, at the same time, and the newer produced red blood cells are likely to 'pick up' more of the glucose that's circulating within the bloodstream.)
Gliclazide is a type of anti-hyperglycaemic medication called a sulfonylurea. This type of medication works by stimulating the beta cells (islets of Langerhans) of the pancreas to produce more insulin.
I'm not sure whether I've interpreted what you've said correctly, ma'am, but my understanding is that the higher than 'normal' blood glucose levels have only come on since your husband was put on prednisolone. If this is the case, AND the prednisolone dose(s) is/are going to be reduced, then the HbA1c test that his GP has stated they've "moved to" will be insufficient. This is because careful control of the balance of prednisolone against the Gliclazide MUST take place, otherwise, if the prednisolone is reduced, the Gliclazide will still be stimulating the pancreas to produce more insulin. This COULD result in your husband's blood glucose levels falling below the 'normal' range, resulting in a hypoglycaemic event/attack. Dependent on just how low, AND how quickly blood glucose levels fall, this could give unneeded side-effects, such as confusion, sweating, blurred vision, tiredness/lethargy (wanting to go to sleep), and others. (I, genuinely, have no intention of frightening you, ma'am, so I won't expand on hypoglycaemia further.)
Prednisolone DOES have to be reduced gradually, ma'am. With it being a steroid, sudden withdrawal can cause side-effects that neither your husband, nor yourself, would want to happen ... particularly whilst he's taking the Gliclazide as well.
Hopefully, ma'am, both your husband and yourself will get a good outcome from the appointment he's been requested to attend at the Health Centre.
Lots of Love and Light.
Mick
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P.S. Please don't be offended, or alarmed, at the 'x's'. It's merely a logo, of sorts, that I've used for 40-odd years now.