Interpretation of BG prick test results

Your first reading is a little high, your next reading is more or less perfect.
Noting that there can be a wide variation between readings taken very close together so don't get hung up on precise values.

Bottom line - your BG has come back down to below your starting level in 2 hours which can't be bad.
It does, of course, depend on what you ate.

I can do those kind of readings if I eat zero carbohydrates in the meal.

Roy Batty said:

The meal in question where I recorded pre and post results of 6.1 and 5.7 was two toasted slices of rye and dark wheat sourdough bread, with tomato puree spread instead of butter and three fried eggs.

I can't think of any reason for my liver to have been dumping glucose, it was just a normal morning.

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When your body needs glucose because of providing energy you need, your liver will dump enough to let you carry on. It is a normal function.
A lot of prediabetics or T2 can get what is known as dawn phenomenon, which your liver will prepare you, for getting up. This may skew a morning fasting reading if you do it too quickly.
Exercise is another reason your liver helps you maintain energy levels.
Glucogenisis will happen when your glucose levels, energy levels start to run out.

Roy Batty said:

Do you suggest then waiting after I get up before testing? For how long?

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At least half an hour, before eating or drinking. A bit of moving around, waking enough, before you test.
That is if you get it enough to skew results.

Can I say, that once you know what your average fasting result is, you don't have to keep doing it. Controlling spikes after food is more important for treatment. Especially if you want to control you prediabetes. I would suggest, pre meal and post, two hours reading. If your BG levels are over two mmols higher than pre meal reading, then something in your meal is causing it.
Then finding out which foods you are more intolerant to and either reduce the portion size or stop eating it.
A good diary can be so useful in seeing how you compare overall from now to the future. It will also help your health team understand what is going on.

Best wishes

@Roy Batty
BG, and the first thing in the morning tests in particular, are the most fickle things. You might drive yourself truly Batty ( ) if you try to understand every single result.
Bg is affected by over 42 factors, including:
Sleep, both quantity and quality
Illness
Medications
Exercise, duration and intensity (or lack of)
And more which I can't even remember.
Our bodies are not machines and don't work on exactly regular schedules.

You could eat the same things, Sleep, at the same times and monitor at the same times and get very different results each time

I've been doing this about 3 years now and as long as my fbg starts with a 5 or a 6 I'm happy. I'm ecstatic with a 4 but have no idea where they come from and if I see a 7 I try to moderate my food that day. That's as accurate as I've learned to be.

Having said that, to spot rough patterns and to learn which foods to definitely avoid, bg testing is very useful. There's nothing more motivating to keep away from the bread when it sends me to 15 or more!

I just say all this to hopefully put a bit of perspective and try to allay too much anxiety on trying to measure and understand the most fickle of biological processes

Roy Batty said:

Thanks for the replies. I don't feel any anxiety, just trying to understand what's happening with my BG.

My first meal of the day is lunch, before I ate my BG was 6.1. I ate in this order a large corn on the cob (boiled) with butter along with a large raw carrot. Then I had a portion of greek yoghurt with keto granola. Two hours later my BG was 7.7, so a rise <2.

I deliberately the high car corn first and I'm aware that eating fibre, protein and fat before carbs can dampen the BG spike.

I may repeat this for lunch tomorrow, but eat the yoghurt with granola first to see if there's any difference.

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It is all about what you can or cannot eat!
As I'm so intolerant to all carbs, the likes of corn, granola, and even too much carrot can effect my BG levels!
You could be okay just adjusting portion control. I don't believe that eating in order of fats, protein then carbs, will help as much. It never did me! But having a sensible approach to good saturated fats, will benefit your diet and your satiety.